Veel gestelde vragen

E-book formaat conversie

Welke conversie formaten worden ondersteund door Calibre?

Calibre ondersteunt de conversie van vele invoerformaten naar vele uitvoerformaten. Conversie is mogelijk van elk invoerformaat in de volgende lijst, naar elk uitvoerformaat.

Invoerformaten: AZW, AZW3, AZW4, CBZ, CBR, CB7, CBC, CHM, DJVU, DOCX, EPUB, FB2, FBZ, HTML, HTMLZ, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT, TXTZ

Uitvoerformaten: AZW3, EPUB, DOCX, FB2, HTMLZ, OEB, LIT, LRF, MOBI, PDB, PMLZ, RB, PDF, RTF, SNB, TCR, TXT, TXTZ, ZIP

Notitie

PRC is een generiek formaat, Calibre ondersteunt PRC-bestanden met TextRead en MOBIBook-headers. PDB is ook een generiek formaat. Calibre ondersteunt eReader, Plucker (alleen invoer), PML en zTxt PDB-bestanden. DJVU-ondersteuning is alleen voor het converteren van DJVU-bestanden die ingesloten tekst bevatten. Deze worden meestal gegenereerd door OCR-software. MOBI-boeken kunnen van twee typen Mobi6 en KF8 zijn. Calibre ondersteunt beide volledig. MOBI-bestanden hebben vaak de bestandsextensies .azw of .azw3. DOCX-bestanden van Microsoft Word 2007 en nieuwer worden ondersteund.

Wat zijn de beste bronformaten voor omzetting?

In volgorde van afnemende voorkeur: LIT, MOBI, AZW, EPUB, AZW3, FB2, FBZ, DOCX, HTML, PRC, ODT, RTF, PDB, TXT, PDF

Ik heb een PDF geconverteerd, maar het bestand heeft verschillende soorten problemen?

PDF is een vreselijk formaat om te converteren. Voor een lijst voor de mogelijke problemen die kunnen optreden bij het converteren van een PDF, zie: PDF-documenten omzetten

Hoe converteer ik mijn bestand met niet-Engelse karakters of smart quotes?

Er zijn twee aspecten aan dit probleem:

  1. Knowing the encoding of the source file: calibre tries to guess what character encoding your source files use, but often, this is impossible, so you need to tell it what encoding to use. This can be done in the GUI via the Input character encoding field in the Look & feel → Text section of the conversion dialog. The command-line tools have an ebook-convert-txt-input --input-encoding option.

  2. When adding HTML files to calibre, you may need to tell calibre what encoding the files are in. To do this go to Preferences → Advanced → Plugins → File type and customize the HTML to ZIP plugin, telling it what encoding your HTML files are in. Now when you add HTML files to calibre they will be correctly processed. HTML files from different sources often have different encodings, so you may have to change this setting repeatedly. A common encoding for many files from the web is cp1252 and I would suggest you try that first. Note that when converting HTML files, leave the input encoding setting mentioned above blank. This is because the HTML to ZIP plugin automatically converts the HTML files to a standard encoding (UTF-8).

Hoe zit het met inhoudsopgaven in MOBI bestanden?

Het eerste wat je je moet realiseren is, dat de meeste e-books twee inhoudsopgaves hebben. De eerste is de traditionele inhoudsopgave, zoals bekend in gedrukte boeken. Deze inhoudsopgave is deel van de hoofd document ‘flow’ en kan naar wens gestijld worden. Dit is de eigenlijke inhoudsopgave.

Dan is er de metadata Inhoudsopgave. Zo’n Inhoudsopgave is geen deel van de boektekst en is normaal toegankelijk via een speciale knop op een reader. Bv. in de calibre e-boekviewer gebruikt u de Inhoudsopgave Tonen knop om het te zien. Het kan niet gestijld worden door de ontwerper van het boek. Hoe het eruit ziet hangt af van het viewer programma.

In the MOBI format, the situation is a little confused. This is because the MOBI format, alone amongst mainstream e-book formats, does not have decent support for a metadata ToC. A MOBI book simulates the presence of a metadata ToC by putting an extra content ToC at the end of the book. When you click Go to Table of Contents on your Kindle, it is to this extra content ToC that the Kindle takes you.

Now it might well seem to you that the MOBI book has two identical ToCs. Remember that one is semantically a content ToC and the other is a metadata ToC, even though both might have exactly the same entries and look the same. One can be accessed directly from the Kindle’s menus, the other cannot.

When converting to MOBI, calibre detects the metadata ToC in the input document and generates an end-of-file ToC in the output MOBI file. You can turn this off by an option in the MOBI Output settings. You can also tell calibre whether to put it at the start or the end of the book via an option in the MOBI Output settings. Remember this ToC is semantically a metadata ToC, in any format other than MOBI it cannot not be part of the text. The fact that it is part of the text in MOBI is an accident caused by the limitations of MOBI. If you want a ToC at a particular location in your document text, create one by hand. So we strongly recommend that you leave the default as it is, i.e. with the metadata ToC at the end of the book. Also note that if you disable the generation of the end-of-file ToC the resulting MOBI file may not function correctly on a Kindle, since the Kindle’s use the metadata ToC for many things, including the Page Flip feature.

If you have a hand edited ToC in the input document, you can use the ToC detection options in calibre to automatically generate the metadata ToC from it. See the conversion section of the User Manual for more details on how to use these options.

Finally, I encourage you to ditch the content ToC and only have a metadata ToC in your e-books. Metadata ToCs will give the people reading your e-books a much superior navigation experience (except on the Kindle, where they are essentially the same as a content ToC).

Notitie

The newer AZW3 format has proper support for a metadata ToC. However, the Kindle firmware tends to malfunction if you disable the generation of the end-of-file inline ToC. So it is recommended that you leave the generated ToC alone. If you create an AZW3 file with a metadata ToC and no end-of-file generated ToC, some features on the Kindle will not work, such as the Page Flip feature.

Hoe zet ik een set HTML-bestanden om in een specifieke volgorde?

Als u een set HTML-bestanden in een specifieke volgorde wilt omzetten, dient u een inhoudsopgavebestand aan te maken, d.w.z. nog een HTML-bestand, dat links naar alle andere bestanden bevat, geplaatst in de gewenste volgorde. Zo’n bestand ziet er als volgt uit:

<html>
   <body>
     <h1>Table of Contents</h1>
     <p style="text-indent:0pt">
        <a href="file1.html">First File</a><br/>
        <a href="file2.html">Second File</a><br/>
        .
        .
        .
     </p>
   </body>
</html>

Voeg dan dit HTML bestand toe aan de GUI en gebruik de Converteren knop om uw e-boek te creëren. U kan de optie in het Inhoudsopgave onderdeel in de conversie dialoog gebruiken voor beheer van hoe de Inhoudsopgave gegenereerd wordt.

Notitie

By default, when adding HTML files, calibre follows links in the files in depth first order. This means that if file A.html links to B.html and C.html and D.html, but B.html also links to D.html, then the files will be in the order A.html, B.html, D.html, C.html. If instead you want the order to be A.html, B.html, C.html, D.html then you must tell calibre to add your files in breadth first order. Do this by going to Preferences → Advanced → Plugins → File type and customizing the HTML to ZIP plugin.

De EPUB die ik maakte met Calibre is ongeldig?

Calibre garandeert niet dat een door Calibre gemaakte EPUB geldig is. De enige garantie die Calibre geeft is dat het een geldige EPUB uitvoert als u geldige XHTML 1.1 + CSS 2.1 aanlevert. Calibre doet zijn best om ervoor te zorgen dat de door Calibre gemaakte EPUB’s daadwerkelijk op een breed scala aan apparaten functioneren zoals bedoeld. Deze doelstelling is onverenigbaar met het maken van geldige EPUB’s en is voor de overgrote meerderheid van de gebruikers van veel groter belang. Als u een tool nodig heeft die altijd geldige EPUB’s maakt, is Calibre niet geschikt voor u. Dit houdt in dat als u een door Calibre gemaakte EPUB naar een online winkel wilt verzenden die de validiteit van EPUB’s controleert, u zelf dient te controleren of de EPUB geldig is. Calibre doet dit namens u niet, m.a.w. u dient bij Calibre geldige XHTML + CSS als de invoerdocumenten aan te leveren.

Hoe maak ik gebruik van enkele van de geavanceerde features van de conversietools?

You can get help on any individual feature of the converters by mousing over it in the GUI or running ebook-convert dummy.html .epub -h at a terminal. A good place to start is to look at the following demo file that demonstrates some of the advanced features html-demo.zip.

Toestel integratie

Welke apparaten worden door Calibre ondersteund?

calibre can directly connect to all the major (and most of the minor) e-book reading devices, smartphones, tablets, etc. In addition, using the Connect to folder function you can use it with any e-book reader that exports itself as a USB disk. Finally, you can connect wirelessly to any device that has a web browser using the calibre Content server.

Hoe kan ik helpen om mijn apparaat te laten ondersteunen door Calibre?

If your device appears as a USB disk to the operating system, adding support for it to calibre is very easy. We just need some information from you:

  • Complete lijst van e-boek formaten die uw toestel ondersteunt

  • Is er een speciale map op het toestel om alle e-boekbestanden te plaatsen? En detecteert het toestel bestanden geplaatst in submappen?

  • We also need information about your device that calibre will collect automatically. First, if your device supports SD cards, insert them. Then connect your device to the computer. In calibre go to Preferences → Miscellaneous and click the “Debug device detection” button. This will create some debug output. Copy it to a file and repeat the process, this time with your device disconnected from your computer.

  • Stuur beide uitvoeren naar ons met de andere informatie en we schrijven een stuurprogramma voor uw toestel.

Once you send us the output for a particular operating system, support for the device in that operating system will appear in the next release of calibre. To send us the output, open a bug report and attach the output to it. See how to report bugs.

Mijn apparaat wordt niet herkend door Calibre?

Volg deze stappen om het probleem te vinden:

  • Zorg ervoor dat u slechts één apparaat tegelijk met uw computer heeft verbonden. U kunt niet tegelijkertijd met een ander door Calibre ondersteund apparaat, zoals een iPhone/iPad, enz. verbonden zijn.

  • If you are connecting an Apple iDevice (iPad, iPod Touch, iPhone), Apple no longer allows third party software to connect to their devices using a USB cable. Instead use a wireless connection, via the calibre Content server.

  • If you are connecting a 2024 Kindle or newer or an Android device, and are on macOS or Linux, read the note under Een USB kabel gebruiken.

  • On macOS if you get permission errors when connecting a device to calibre, you can fix that by looking under System Preferences > Security and Privacy > Privacy > Files and Folders.

  • Make sure you are running the latest version of calibre (currently 7.21.100). The latest version can always be downloaded from the calibre website. You can tell what version of calibre you are currently running by looking at the bottom line of the main calibre window.

  • Zorg ervoor dat uw besturingssysteem het toestel ziet, d.w.z. het toestel hoort zichtbaar te zijn in Windows Verkenner (in Windows) of Finder (in macOS).

  • Ga in calibre naar Voorkeuren → Delen → Genegeerde toestellen en controleer of uw toestel niet genegeerd wordt

  • Als alle bovenstaande stappen mislukken, ga naar Voorkeuren → Geavanceerd → Diversen en klik op Foutzoeken toesteldetectie met uw toestel aangesloten en post de uitvoer als een ticket op de calibre bug tracker.

Mijn apparaat is niet-standaard of ongebruikelijk. Hoe kan ik verbinding ermee maken?

In addition to the Connect to folder function found under the Connect/share button, calibre provides a User defined device plugin that can be used to connect to any USB device that shows up as a disk drive in your operating system. Note: on Windows, the device must have a drive letter for calibre to use it. See the device plugin Preferences -> Plugins -> Device plugins -> User defined and Preferences -> Miscellaneous -> Get information to setup the user defined device for more information. Note that if you are using the user defined plugin for a device normally detected by a builtin calibre plugin, you must disable the builtin plugin first, so that your user defined plugin is used instead.

Hoe gebruik ik Calibre op mijn iPad/iPhone/iPod touch?

Een gemakkelijke manier om uw calibre collectie te doorbladeren vanop uw Apple toestel is via gebruik van De calibre Content server, wat uw verzameling beschikbaar maakt via het net. Voer eerst volgende stappen uit in calibre

  • Stel het Voorkeur Uitvoer Formaat in calibre in op EPUB (Het uitvoerformaat kan ingesteld worden in Voorkeuren → Interface → Gedrag)

  • Stel het uitvoerprofiel in op iPad (dit werkt ook voor iPhone/iPads) in Voorkeuren → Conversie → Algemene opties → Pagina opmaak

  • Converteer de boeken die u wilt lezen op uw iDevice naar EPUB formaat door ze te selecteren en te klikken op de Converteren knop.

  • Zet de Content server aan door te klikken op de Verbinden/delen knop en laat calibre draaien. U kan calibre ook zeggen om de Content server automatisch te starten via Voorkeuren → Delen → Delen over (inter)net.

De Content server laat u toe boeken direct in Safari lezen. Bijkomend zijn er veel apps voor uw iDevice die met de calibre Content server kunnen verbinden. Voorbeelden: Marvin, Mapleread en iBooks zelf.

De Content server gebruiken.

Start de Safari browser en tik het IP adres en de poort van de computer die de calibre server draaien in, zoals dit:

http://192.168.1.2:8080/

Vervang 192.168.1.2 door het lokale IP adres van de computer die calibre draait. Bekijk De calibre Content server voor details over het draaien van de server en het correcte IP adres vinden om te gebruiken

U zal een lijst met boeken zien in Safari, tik op een boek en u krijgt de optie ofwel het te downloaden ofwel het te lezen in de browser. Als u kiest voor downloaden, vraagt Safari of u het wilt openen met iBooks.

Many reading apps support browsing the calibre library directly via its OPDS support. In such apps you can go to the online catalog screen and add the IP address of the calibre server to browse and download books from your calibre library within the app.

How do I use calibre with my Android phone/tablet or Kindle Fire?

There are two ways that you can connect your Android device to calibre. Using a USB cable – or wirelessly, over the air. The first step to using an Android device is installing an e-book reading application on it. There are many free and paid e-book reading applications for Android: Some examples (in no particular order): FBReader, Moon+, Mantano, Aldiko, Kindle.

Een USB kabel gebruiken

Simply plug your device into the computer with a USB cable. calibre should automatically detect the device and then you can transfer books to it by clicking the Send to device button. Note that on macOS and Linux only a single program can connect to an Android device at a time, so make sure the device is not opened in the OS File manager, or the Android File Transfer utility, etc.

Notitie

With newer Android devices, you might have to jump through a few hoops to get the connection working, as Google really does not want you to be independent of its cloud. First, unlock the screen before plugging in the USB cable. When you plugin in the USB cable you will get a popup notification. Make sure it says some thing like “Transferring Media files” or “MTP (Media Transfer mode)”. If it does not, tap the notification, and change the mode to Media Transfer (MTP). You may need to restart calibre at this point in order for your device to be recognized. Finally, you might get a popup on the device every time calibre or the operating system actually tries to connect to it, asking for permission, tap OK.

Notitie

With the Kindle Fire 8 or newer there is an icon that shows up when the USB cable is plugged in, showing that the device is charging. Tap that and switch the device to data transfer mode, and then start calibre, it should then be detected.

Door de lucht

calibre has a builtin web server, the calibre Content server. It makes your calibre collection available over the net. You can browse it on your device using a simple browser or a dedicated application. First perform the following steps in calibre:

  • Set the Preferred Output Format in calibre to EPUB for normal Android devices or MOBI for Kindles (The output format can be set under Preferences → Interface → Behavior)

  • Converteer de boeken die u wilt lezen op uw toestel naar EPUB/MOBI formaat door ze te selecteren en te klikken op de Converteren knop.

  • Zet de Content server aan in calibre’s voorkeuren en laat calibre draaien.

Op je Android toestel, open de browser en surf naar

Vervang 192.168.1.2 door het lokale IP adres van de computer die calibre draait. Bekijk De calibre Content server voor details over het draaien van de server en het correcte IP adres vinden om te gebruiken

U kan nu uw boekencollectie doorbladeren en boeken downloaden van calibre naar uw toestel om te openen met eender welke e-boek leessoftware dat u hebt op uw Android toestel.

Many reading apps support browsing the calibre library directly via its OPDS support. In such apps you can go to the online catalog screen and add the IP address of the calibre server to browse and download books from your calibre library within the app.

Heb ik toegang tot mijn calibre boeken via de browser op mijn Kindle of ander leestoestel?

calibre heeft een Content server die de boeken in calibre exporteert als webpagina. Bekijk De calibre Content server voor details.

Some devices, like the Kindle (1/2/DX), do not allow you to access port 8080 (the default port on which the content server runs). In that case, change the port in the calibre Preferences to 80. (On some operating systems, you may not be able to run the server on a port number less than 1024 because of security settings. In this case the simplest solution is to adjust your router to forward requests on port 80 to port 8080).

Also some devices do not have browsers advanced enough to run the app-like interface used by the Content server. For such devices, you can simply add /mobile to the server URL to get a simplified, non-JavaScript interface.

Ik kan geen e-mails verzenden vanuit Calibre?

Because of the large amount of spam in email, sending email can be tricky, as different mail servers use different strategies to block email. The most common problem is if you are sending email directly (without a mail relay) in calibre. Many servers (for example, Amazon) block email that does not come from a well known relay. The most robust way to setup email sending in calibre is to do the following:

  • Creëer een gratis GMX account op GMX.

  • Go to Preferences → Sharing → Sharing books by email in calibre and click the Use GMX button and fill in the information asked for.

  • Log into your GMX account on the website and enable SMTP sending (Settings->POP3 & IMAP->Send and receive emails via external program)

  • calibre will then be able to use GMX to send the mail.

  • If you are sending to your Kindle, remember to update the email preferences on your Amazon Kindle page to allow email sent from your GMX email address. Also note that Amazon does not allow email delivery of AZW3 and new style (KF8) MOBI files. Finally, Amazon recently started sending confirmation emails that you have to click on back to your GMX account before the book is actually delivered.

Even after doing this, you may have problems. One common source of problems is that some poorly designed antivirus programs block calibre from opening a connection to send email. Try adding an exclusion for calibre in your antivirus program.

Notitie

Microsoft/GMX can disable your account if you use it to send large amounts of email. So, when using these services to send mail calibre automatically restricts itself to sending one book every five minutes. If you don’t mind risking your account being blocked you can reduce this wait interval by going to Preferences → Advanced → Tweaks in calibre.

Notitie

Google recently deliberately broke their email sending protocol (SMTP) support in an attempt to force everyone to use their web interface so they can show you more ads. They are trying to claim that SMTP is insecure, that is incorrect and simply an excuse. Use some other email provider instead.

Notitie

If you are concerned about giving calibre access to your email account, simply create a new free email account with GMX or Outlook and use it only for calibre.

My device is getting mounted read-only in Linux, so calibre cannot connect to it?

Linux kernels mount devices read-only when their filesystems have errors. You can repair the filesystem with:

sudo fsck.vfat -y /dev/sdc

Replace /dev/sdc with the path to the device node of your device. You can find the device node of your device, which will always be under /dev by examining the output of:

mount

Why does calibre not support collections on the Kindle or shelves on the Nook?

Neither the Kindle nor the Nook provide any way to manipulate collections over a USB connection. If you really care about using collections, I would urge you to sell your Kindle/Nook and get a Kobo. Only Kobo seems to understand that life is too short to be entering collections one by one on an e-ink screen 😇

Note that in the case of the Kindle, there is a way to manipulate collections via USB, but it requires that the Kindle be rebooted every time it is disconnected from the computer, for the changes to the collections to be recognized. As such, it is unlikely that any calibre developers will ever feel motivated enough to support it. There is however, a calibre plugin that allows you to create collections on your Kindle from the calibre metadata. It is available from here.

Notitie

Amazon have removed the ability to manipulate collections completely in their newer models, like the Kindle Touch and Kindle Fire, making even the above plugin useless, unless you root your Kindle and install custom firmware.

Ik krijg steeds een foutmelding wanneer ik Calibre gebruik met de Kobo Touch/Glo/etc.?

The Kobo has very buggy firmware. Connecting to it has been known to fail at random. Certain combinations of motherboard, USB ports/cables/hubs can exacerbate this tendency to fail. If you are getting an error when connecting to your touch with calibre try the following, each of which has solved the problem for some calibre users.

  • Koppel de Kobo direct aan je computer, niet via een USB hub.

  • Probeer een andere USB kabel en een andere USB poort op je computer.

  • Meld je af op de Kobo en meld je opnieuw aan, dit zorgt ervoor dat de gegevensbank opnieuw opgebouwd wordt en de gegevensbank corruptie fouten verholpen.

  • Probeer de laatste firmware te upgraden op je Kobo Touch.

  • Probeer je Kobo te resetten (soms lost dit het probleem op voor een tijdje, maar dan duikt dit probleem weer op en moet je weer opnieuw resetten)

  • Probeer één of twee boeken te zetten op de Kobo per keer en hou je collectie klein op de Kobo.

Covers for books I send to my e-ink Kindle show up momentarily and then are replaced by a generic cover?

This happens because of an Amazon bug. They try to download a cover for the book from their servers and when that fails, they replace the existing cover that calibre created with a generic cover. For details see this forum thread. As of version 4.17, calibre has a workaround, where if you connect the Kindle to calibre after the covers have been destroyed by Amazon, calibre will restore them automatically. So in order to see the covers on your Kindle, you have to:

  1. Send the book to the Kindle with calibre

  2. Disconnect the Kindle and wait for Amazon to destroy the cover

  3. Reconnect the Kindle to calibre

Note that this workaround only works for books sent with calibre 4.17 or later. Alternately, simply keep your Kindle in airplane mode, you don’t really want Amazon knowing every book you read anyway. I encourage you to contact Amazon customer support and complain loudly about this bug. Maybe Amazon will listen.

Notitie

If the workaround is not working for you make sure you Kindle firmware is at least version 5.12.5, released in April 2020.

Covers for books sent to my Kindle ColorSoft do not show up in the book list?

Amazon deliberately broke this functionality in their ColorSoft in order to discourage you from reading non Amazon books on their devices. See this forum thread for details. The only known workaround is to send the books as “Personal documents” to the Kindle which will fix the covers not showing up but break other features such as Whispersync and the books will show up under “Personal documents” not “Books” on the device. To enable this in calibre go to Preferences → Output options → MOBI output and enable the check box that says Enable sharing of book content. This will cause all future books sent to the Kindle by calibre to be marked as personal documents.

De omslagen voor mijn MOBI bestanden worden niet meer getoond in Kindle voor PC/Kindle voor Android/iPad enz.

Dit wordt veroorzaakt door een bug in de Amazon software. U kan hier rond werken door naar Voorkeuren → Conversie → Uitvoer Opties → MOBI uitvoer te gaan en de optie Delen van boekinhoud inschakelen in te stellen. Als u een vroeger geconverteerd boek weer converteert, moet u deze optie ook inschakelen in de conversie dialoog voor dat individueel boek (omdat per boek conversie instellingen worden opgeslagen en voorrang hebben).

Note that doing this will mean that the generated MOBI will show up under personal documents instead of Books on the Kindle Fire and Amazon whispersync will not work, but the covers will. It’s your choice which functionality is more important to you. I encourage you to contact Amazon and ask them to fix this bug.

The bug in Amazon’s software is that when you put a MOBI file on a Kindle, unless the file is marked as a Personal document, Amazon assumes you bought the book from it and tries to download the cover thumbnail for it from its servers. When the download fails, it refuses to fallback to the cover defined in the MOBI file. This is likely deliberate on Amazon’s part to try to force authors to sell only through them. In other words, the Kindle only displays covers for books marked as Personal Documents or books bought directly from Amazon.

If you send a MOBI file to an e-ink Kindle with calibre using a USB connection, calibre works around this Amazon bug by uploading a cover thumbnail itself. However, that workaround is only possible when using a USB connection and sending with calibre. Note that if you send using email, Amazon will automatically mark the MOBI file as a Personal Document and the cover will work, but the book will show up in Personal Documents.

Ik heb boeken overgezet op mijn Kindle, gebruik makend van Calibre. Waarom worden deze niet getoond?

Books sent to the Kindle only show up on the Kindle after they have been indexed by the Kindle. This can take some time. If the book still does not show up after some time, then it is likely that the Kindle indexer crashed. Sometimes a particular book can cause the indexer to crash. Unfortunately, Amazon has not provided any way to deduce which book is causing a crash on the Kindle. Your only recourse is to either reset the Kindle, or delete all files from its memory using Windows Explorer (or whatever file manager you use) and then send the books to it again, one by one, until you discover the problem book. Once you have found the problem book, delete it off the Kindle and do a MOBI to MOBI or MOBI to AZW3 conversion in calibre and then send it back. This will most likely take care of the problem.

Library management

Waar worden mijn boekbestanden opgeslagen?

When you first run calibre, it will ask you for a folder in which to store your books. Whenever you add a book to calibre, it will copy the book into that folder. Books in the folder are nicely arranged into sub-folders by Author and Title. Note that the contents of this folder are automatically managed by calibre, do not add any files/folders manually to this folder, as they may be automatically deleted. If you want to add a file associated to a particular book, use the top right area of Edit metadata dialog to do so. Then, calibre will automatically put that file into the correct folder and move it around when the title/author changes.

Metadata about the books is stored in the file metadata.db at the top level of the library folder. This file is a sqlite database. When backing up your library make sure you copy the entire folder and all its sub-folders.

The library folder and all its contents make up what is called a calibre library. You can have multiple such libraries. To manage the libraries, click the calibre icon on the toolbar. You can create new libraries, remove/rename existing ones and switch between libraries easily.

You can copy or move books between different libraries (once you have more than one library setup) by right clicking on a book and selecting the Copy to library action.

Hoe gaat Calibre om met auteursnamen en sorteren?

Author names are complex, especially across cultures, see this note for some of the complexities. calibre has a very flexible strategy for managing author names. The first thing to understand is that books and authors are separate entities in calibre. A book can have more than one author, and an author can have more than one book. You can manage the authors of a book by the edit metadata dialog. You can manage individual authors by right clicking on the author in the Tag browser on the left of the main calibre window and selecting Manage authors. Using this dialog you can change the name of an author and also how that name is sorted. This will automatically change the name of the author in all the books of that author. When a book has multiple authors, separate their names using the & character.

Now coming to author name sorting:

  • When a new author is added to calibre (this happens whenever a book by a new author is added), calibre automatically computes a sort string for both the book and the author.

  • Authors in the Tag browser are sorted by the sort value for the authors. Remember that this is different from the Author sort field for a book.

  • By default, this sort algorithm assumes that the author name is in First name Last name format and generates a Last name, First name sort value.

  • You can change this algorithm by going to Preferences → Advanced → Tweaks and setting the author_sort_copy_method tweak.

  • You can force calibre to recalculate the author sort values for every author by right clicking on any author and selecting Manage authors, then pushing the Recalculate all author sort values button. Do this after you have set the author_sort_copy_method tweak to what you want.

  • You can force calibre to recalculate the author sort values for all books by using the bulk metadata edit dialog (select all books and click edit metadata, check the Automatically set author sort checkbox, then press OK).

  • When recalculating the author sort values for books, calibre uses the author sort values for each individual author. Therefore, ensure that the individual author sort values are correct before recalculating the books’ author sort values.

  • You can control whether the Tag browser display authors using their names or their sort values by setting the categories_use_field_for_author_name tweak in Preferences → Advanced → Tweaks

Note that you can set an individual author’s sort value to whatever you want using Manage authors. This is useful when dealing with names that calibre will not get right, such as complex multi-part names like Miguel de Cervantes Saavedra or when dealing with Asian names like Sun Tzu.

With all this flexibility, it is possible to have calibre manage your author names however you like. For example, one common request is to have calibre display author names LN, FN. To do this, and if the note below does not apply to you, then:

  • Set the author_sort_copy_method tweak to copy as described above.

  • Herstart calibre. Verander geen metadata vooraleer de volgende stappen te ondernemen.

  • Change all author names to LN, FN using the Manage authors dialog.

  • After you have changed all the authors, press the Recalculate all author sort values button.

  • Press OK, at which point calibre will change the authors in all your books. This can take a while.

Notitie

When changing from FN LN to LN, FN, it is often the case that the values in author_sort are already in LN, FN format. If this is your case, then do the following:

  • Set the author_sort_copy_method tweak to copy as described above.

  • Herstart calibre. Verander geen metadata vooraleer de volgende stappen te ondernemen.

  • Open the Manage authors dialog. Press the copy all author sort values to author button.

  • Check through the authors to be sure you are happy. You can still press Cancel to abandon the changes. Once you press OK, there is no undo.

  • Press OK, at which point calibre will change the authors in all your books. This can take a while.

Why doesn’t calibre let me store books in my own folder structure?

The whole point of calibre’s library management features is that they provide a search and sort based interface for locating books that is much more efficient than any possible folder scheme you could come up with for your collection. Indeed, once you become comfortable using calibre’s interface to find, sort and browse your collection, you won’t ever feel the need to hunt through the files on your disk to find a book again. By managing books in its own folder structure of Author -> Title -> Book files, calibre is able to achieve a high level of reliability and standardization. To illustrate why a search/tagging based interface is superior to folders, consider the following. Suppose your book collection is nicely sorted into folders with the following scheme:

Genre -> Author -> Series -> ReadStatus

Now this makes it very easy to find for example all science fiction books by Isaac Asimov in the Foundation series. But suppose you want to find all unread science fiction books. There’s no easy way to do this with this folder scheme, you would instead need a folder scheme that looks like:

ReadStatus -> Genre -> Author -> Series

In calibre, you would instead use tags to mark genre and read status and then just use a simple search query like tag:scifi and not tag:read. calibre even has a nice graphical interface, so you don’t need to learn its search language instead you can just click on tags to include or exclude them from the search.

To those of you that claim that you need access to the filesystem, so that you can have access to your books over the network, calibre has an excellent Content server that gives you access to your calibre library over the net.

If you are worried that someday calibre will cease to be developed, leaving all your books marooned in its folder structure, explore the powerful Save to disk feature in calibre that lets you export all your files into a folder structure of arbitrary complexity based on their metadata.

Finally, the reason there are numbers at the end of every title folder, is for robustness. That number is the id number of the book record in the calibre database. The presence of the number allows you to have multiple records with the same title and author names. It is also part of what allows calibre to magically regenerate the database with all metadata if the database file gets corrupted. Given that calibre’s mission is to get you to stop storing metadata in filenames and stop using the filesystem to find things, the increased robustness afforded by the id numbers is well worth the uglier folder names.

Als je nog steeds niet overtuigd bent, vrees ik ervoor dat Calibre niets is voor je. Om duidelijk te zijn, dit zal niet veranderen. Gelieve ons niet te contacteren, in een poging om onze gedachten te veranderen.

Waarom heeft Calibre geen kolom voor foo?

calibre is designed to have columns for the most frequently and widely used fields. In addition, you can add any columns you like. Columns can be added via Preferences → Interface → Add your own columns. Watch the tutorial UI Power tips to learn how to create your own columns, or read this blog post.

You can also create “virtual columns” that contain combinations of the metadata from other columns. In the add column dialog use the Quick create links to easily create columns to show the book ISBN or formats. You can use the powerful calibre template language to do much more with columns. For more details, see De calibre sjabloontaal.

Kan ik ook een kolom krijgen die formaten of ISBN toont?

Ja, het is mogelijk. Volg bovenstaande instructies om een maat gemaakte kolom toe te voegen.

Hoe kan ik de Calibre gegevens van de ene computer naar de andere overzetten?

You can export all calibre data (books, settings and plugins) and then import it on another computer. First let’s see how to export the data:

  • Right click the calibre icon in the main calibre toolbar and select Export/import all calibre data. Note that if there is currently a device connected, this menu option will not be available – so, disconnect any connected devices. Then click the button labelled Export all your calibre data. You will see a list of all your calibre libraries. Click OK and choose an empty folder somewhere on your computer. The exported data will be saved in this folder. Simply copy this folder to your new computer and follow the instructions below to import the data.

  • Install calibre on your new computer and run through the Welcome wizard, it does not matter what you do there, as you will be importing your old settings in the next step. You will now have an empty calibre, with just the Getting Started guide in your library. Once again, right click the calibre button and choose Export/import all calibre data. Then click the button labelled Import previously exported data. Select the folder with the exported data that you copied over earlier. You will now have a list of libraries you can import. Go through the list one by one, and select the new location for each library (a location is just an empty folder somewhere on your computer). Click OK. After the import completes, calibre will restart, with all your old libraries, settings and calibre plugins.

Notitie

De import/export functionaliteit is enkel beschikbaar vanaf Calibre versie 2.47. Als je een oudere versie hebt van Calibre, of als problemen tegenkomt met import/export, kun je de Calibre bibliotheek map manueel overschrijven, zoals beschreven in volgend paragraaf.

Simply copy the calibre library folder from the old to the new computer. You can find out what the library folder is by clicking the calibre icon in the toolbar. Choose the Switch/create calibre library action and you will see the path to the current calibre library.

Now on the new computer, start calibre for the first time. It will run the Welcome wizard asking you for the location of the calibre library. Point it to the previously copied folder. If the computer you are transferring to already has a calibre installation, then the Welcome wizard won’t run. In that case, right-click the calibre icon in the toolbar and point it to the newly copied folder. You will now have two calibre libraries on your computer and you can switch between them by clicking the calibre icon on the toolbar. Transferring your library in this manner preserves all your metadata, tags, custom columns, etc.

De boekenlijst in Calibre is leeg!

In order to understand why that happened, you have to understand what a calibre library is. At the most basic level, a calibre library is just a folder. Whenever you add a book to calibre, that book’s files are copied into this folder (arranged into sub folders by author and title). Inside the calibre library folder, at the top level, you will see a file called metadata.db. This file is where calibre stores the metadata like title/author/rating/tags etc. for every book in your calibre library. The list of books that calibre displays is created by reading the contents of this metadata.db file.

Er kunnen twee redenen zijn waarom Calibre een lege lijst toont van boeken:

  • Your calibre library folder changed its location. This can happen if it was on an external disk and the drive letter for that disk changed. Or if you accidentally moved the folder. In this case, calibre cannot find its library and so starts up with an empty library instead. To remedy this, do a right-click on the calibre icon in the calibre toolbar and select Switch/create library. Click the little blue icon to select the new location of your calibre library and click OK. If you don’t know the new location search your computer for the file metadata.db.

  • Je metadata.db bestand was verwijderd/corrupt. In dit geval, kan calibre de metadata.db herstellen van de backups. Rechtermuisklik op het calibre icoon in de calibre toolbar en kies voor Bibliotheek onderhoud -> herstel database. calibre zal automatisch de metadata.db herstellen.

Waarom krijg ik foutmeldingen met met Calibre bibliotheek op een netwerk map/NAS?

Zet niet je Calibre bibliotheek op een netwerk map.

A filesystem is a complex beast. Most network filesystems lack various filesystem features that calibre uses. Some don’t support file locking, some don’t support hardlinking, some are just flaky. Additionally, calibre is a single user application, if you accidentally run two copies of calibre on the same networked library, bad things will happen. Finally, different OSes impose different limitations on filesystems, so if you share your networked drive across OSes, once again, bad things will happen.

Consider using the calibre Content server to make your books available on other computers. Run calibre on a single computer and access it via the Content server or a Remote Desktop solution.

If you must share the actual library, use a file syncing tool like DropBox or rsync instead of a networked drive. If you are using a file-syncing tool it is essential that you make sure that both calibre and the file syncing tool do not try to access the calibre library at the same time. In other words, do not run the file syncing tool and calibre at the same time.

Even with these tools there is danger of data corruption/loss, so only do this if you are willing to live with that risk. In particular, be aware that Google Drive is incompatible with calibre, if you put your calibre library in Google Drive, you will suffer data loss. See this thread for details.

Diversen

Amazon is stopping email delivery of MOBI files?

Amazon have announced that they will stop accepting MOBI files emailed to @kindle.com email addresses. You can instruct calibre to send EPUB instead of MOBI by going to Preferences → Sharing books by email and then removing MOBI from the list of formats to send to your @kindle.com email address and adding EPUB instead.

Note however, that Amazon’s EPUB intake is very flawed, they will reject a number of EPUB files that work everywhere else. In such cases you can try the following trick:

  1. Convert the EPUB file to MOBI

  2. Then convert the MOBI file back to EPUB and send the resulting EPUB file

This will remove all advanced formatting, embedded fonts, etc., but greatly increase the chances of Amazon accepting the EPUB.

Notitie

If you were previously using email delivery of periodicals downloaded by calibre, you will be better off sending those by USB cable or downloading them from the calibre Content server via the Kindle’s built-in browser. However, if you want to continue using email delivery you can try changing the output format in Preferences->Behavior to EPUB, then calibre will download the news in EPUB format. Whether Amazon will accept the EPUB or not is a whole other question.

Ik wil dat Calibre nieuws download van mijn favoriete nieuws website.

If you are reasonably proficient with computers, you can teach calibre to download news from any website of your choosing. To learn how to do this see Uw favoriete nieuws website toevoegen.

Otherwise, you can request a particular news site by posting in the calibre Recipes forum.

Vanwaar de naam Calibre?

Maak een keuze:

  • Converter And LIBRary for E-books

  • A high calibre product

  • A tribute to the SONY Librie which was the first e-ink based e-book reader

  • Mijn vrouw heeft hiervoor gekozen ;-)

Calibre is niet uitgesproken als cal-i-ber niet ca-li-bre. Als je het afvraagt, Calibre is de Britse/gemenebest spelling voor Calibre. Als een Indiaan, dat is de natuurlijke spelling voor mij.

Why does calibre show only some of my fonts on macOS?

calibre embeds fonts in e-book files it creates. E-book files support embedding only TrueType and OpenType (.ttf and .otf) fonts. Most fonts on macOS systems are in .dfont format, thus they cannot be embedded. calibre shows only TrueType and OpenType fonts found on your system. You can obtain many such fonts on the web. Simply download the .ttf/.otf files and add them to the Library/Fonts folder in your home folder.

Calibre start niet in Windows?

Er kunnen meerdere redenen hiervoor zijn:

  • If you get no errors but the calibre window does not appear, it has probably just appeared off screen. You can gather all windows onto the current screen using one of the techniques described here.

  • Some software has been known to interfere with calibre, try rebooting in Safe mode and see if it works. A known culprit is the Sunshine screen sharing software.

  • Als je een foutmelding krijgt dat Calibre een bestand niet kan openen omdat het in gebruik is door een ander programma, probeer het volgende:

    • deïnstalleer Calibre

    • Herstart uw computer

    • Herinstalleer Calibre. Maar start Calibre niet vanaf de installatie wizard.

    • Probeer je anti virus programma tijdelijk uit te schakelen. (om veilig te zijn, zorg je ervoor dat je niet verbonden bent met het internet)

    • Kijk in de map waar je calibre bibliotheek staat. Verwijder metadata.db.

    • Start Calibre

    • Vanaf nu zou Calibre normaal moeten opstarten.

  • If you get an error about a Python function terminating unexpectedly after upgrading calibre, first uninstall calibre, then delete the folders (if they exists) C:\Program Files\Calibre and C:\Program Files\Calibre2. Now re-install and you should be fine.

  • If you get an error in the Welcome wizard on an initial run of calibre, try choosing a folder like C:\library as the calibre library (calibre sometimes has trouble with library locations if the path contains non-English characters, or only numbers, etc.)

  • Try running it as administrator (Right click on the icon and select Run as administrator)

If it still won’t launch, start a command prompt (press the Windows key and R; then type cmd.exe in the Run dialog that appears). At the command prompt type the following command and press Enter:

calibre-debug -g

Post any output you see in a help message on the Forum.

Crashed of reageert niet Calibre regelmatig?

Er zijn verschillende mogelijkheden dat ik weet van heb, dat dit kan veroorzaken:

  • Je hebt recentelijk een externe monitor of TV aan je computer gekoppeld. Als dit het geval is, wanneer calibre een nieuw venster opent, zoals “metadata bewerken” & “boeken omzetten”, wordt het niet getoont op het andere scherm, daarom denk je dat er niets gebeurd. Ontkoppel je tweede monitor en herstart calibre.

  • The following programs have been reported to cause crashes in calibre: If you are running any of these, close them before starting calibre, or uninstall them: RoboForm, Logitech SetPoint Settings, Constant Guard Protection by Xfinity, Spybot, Killer Network Manager, Nahimic UI Interface, Acronis True Image.

  • Je gebruikt een Wacom USB muis/tablet. Er is een incomptabiliteit tussen de Wacom stuurprogramma’s en de grafische omgeving die Calibre gebruikt. Probeer een muis die niet van Wacom is.

  • Op sommige 64 bit versies van Windows zijn er veiligheid software/instellingen die voorkomen dat de 64 bit versie van calibre normaal opstart. Als je de 64 bit versie van calibre gebruikt, probeer dan de 32 bit versie.

  • If the crash happens when you are trying to copy text from the calibre E-book viewer, it is most likely caused by some clipboard monitoring/managing application you have running. Turn it off and you should be fine.

  • If the crashes happen specifically when you are using a file dialog, like clicking on the Add books button or the Save to Disk button, then you have some software that has installed broken Shell extensions on your computer. Known culprits include: SpiderOak, odrive sync and Dell Backup and Recovery and NetDrive. If you have one of these, uninstall them and you will be fine. You can also use the NirSoft Shell Extension Viewer to see what shell extensions are installed on your system and disable them individually, if you don’t want to uninstall the full program. Remember to use “Restart Explorer” or reboot your computer after disabling the shell extensions.

If none of the above apply to you, then there is some other program on your computer that is interfering with calibre. First reboot your computer in safe mode, to have as few running programs as possible, and see if the crashes still happen. If they do not, then you know it is some program causing the problem. The most likely such culprit is a program that modifies other programs’ behavior, such as an antivirus, a device driver, something like RoboForm (an automatic form filling app) or an assistive technology like Voice Control or a Screen Reader.

Om uit te zoeken welk programma dat de schuldige is, elimineer één per één om te kijken dewelke de oorzaak is. Om een programma te stoppen: start Calibre op, controleer of er geen crash is. Als er nog steeds een crash is, probeer dan een ander programma te stoppen en probeer opnieuw.

The calibre E-book viewer and Edit book tools do not work on Windows?

These two programs use hardware acceleration as they embed a version of the Chrome browser to render HTML. If they do not work it will be because of incompatibility with your system’s GPU (graphics) drivers. Try updating these first, and reboot. If that does not fix it, you can set the QTWEBENGINE_CHROMIUM_FLAGS environment variable to the value --disable-gpu to turn off hardware acceleration. See this page for details.

Using the viewer or doing any conversions results in a permission denied error on Windows

Something on your computer is preventing calibre from accessing its own temporary files. Most likely the permissions on your Temp folder are incorrect. Go to the folder file:C:\Users\USERNAME\AppData\Local in Windows Explorer and then right click on the file:Temp folder, select Properties and go to the Security tab. Make sure that your user account has full control for this folder.

Some users have reported that running the following command in an Administrator Command Prompt fixed their permissions. To get an Administrator Command Prompt search for cmd.exe in the start menu, then right click on the command prompt entry and select Run as administrator. At the command prompt type the following command and press Enter:

icacls "%appdata%\..\Local\Temp" /reset /T

Als alternatief, kun je Calibre uitvoeren als Administrator, maar sommige fuctionaliteit kan mogelijk niet werken zoals copiëren en plakken.

Eindelijk, sommige gebruikers hebben gemeld dat het uitschakelen van UAC het probleem verhelpt.

calibre is not starting/crashing on macOS?

One common cause of failures on macOS is the use of accessibility technologies that are incompatible with the graphics toolkit calibre uses. Try turning off VoiceOver if you have it on. Also go to System Preferences->System->Universal Access and turn off the setting for enabling access for assistive devices in all the tabs. Another cause can be some third party apps that modify system behavior, such as Smart Scroll.

Je kan de debug output achterhalen waarom Calibre niet kan starten door het Console.app te laten lopen. De debug output zal daar staan. Als de debug output een regel bevat als:

Qt: internal: -108: Error ATSUMeasureTextImage text/qfontengine_mac.mm

then the problem is probably a corrupted font cache. You can clear the cache by following these instructions. If that doesn’t solve it, look for a corrupted font file on your system, in ~/Library/Fonts or the like. An easy way to check for corrupted fonts in macOS is to start the “Font Book” application, select all fonts and then in the File menu, choose “Validate fonts”.

I get only a black or white screen when running the calibre E-book viewer?

This will be because of an incompatibility between Qt WebEngine, which the viewer uses to render and the GPU drivers on your system. First try upgrading the GPU drivers. If that does not help, you can try turning off hardware acceleration in Qt WebEngine by setting the environment variable QTWEBENGINE_CHROMIUM_FLAGS to the value --disable-gpu. See Omgevingsvariabelen for how to change environment variables.

I heb het installatie bestand gedownload, waarom werkt het niet?

Downloading from the Internet can sometimes result in a corrupted download. If the calibre installer you downloaded is not opening, try downloading it again. If re-downloading it does not work, download it from an alternate location. If the installer still doesn’t work, then something on your computer is preventing it from running.

  • Probeer tijdelijk je anti virus programma uit te schakelen. (Microsoft Security Essentials, of Kaspersky of Norton of McAfee of wat dan ook). Dit is wellicht de reden waarom het update proces blijft hangen.

  • Similarly, if the installer is failing/rolling back and you have Microsoft PowerToys running, quit it.

  • If you have installed to a non-standard location, try running the installer as Administrator

  • Try rebooting your computer and running a registry cleaner like Wise registry cleaner.

  • Probeer een schone installatie. Dat betekent, verwijder het bestand: file:C:\Program Files\Calibre2 (of waar je de vorige keer Calibre hebt geïnstalleerd). Daarna, voer de installatie opnieuw uit. Opnieuw installeren verwijderd niet je boeken of instellingen.

  • Try downloading the installer with an alternate browser. For example if you are using Microsoft Edge, try using Firefox or Chrome instead.

  • If you get an error about a missing DLL on Windows, then most likely, the permissions on your temporary folder are incorrect. Go to the folder C:\Users\USERNAME\AppData\Local in Windows Explorer and then right click on the Temp folder and select Properties and go to the Security tab. Make sure that your user account has full control for this folder.

If you still cannot get the installer to work and you are on Windows, you can use the calibre portable install, which does not need an installer (it is just a ZIP file).

Mijn antivirus programma beweert dat Calibre een virus/trojaan paars is?

The first thing to check is that you are downloading calibre from the official website. Make sure you are clicking the download links on the left, not the advertisements on the right. calibre is a very popular program and unscrupulous people try to setup websites offering it for download to fool the unwary.

If you have the official download and your antivirus program is still claiming calibre is a virus, then, your antivirus program is wrong. Antivirus programs use heuristics, patterns of code that “look suspicious” to detect viruses. It’s rather like racial profiling. calibre is a completely open source product. You can actually browse the source code yourself (or hire someone to do it for you) to verify that it is not a virus. Please report the false identification to whatever company you buy your antivirus software from. If the antivirus program is preventing you from downloading/installing calibre, disable it temporarily, install calibre and then re-enable it.

Hoe maak ik een backup van Calibre?

The most important thing to backup is the calibre library folder, that contains all your books and metadata. This is the folder you chose for your calibre library when you ran calibre for the first time. You can get the path to the library folder by clicking the calibre icon on the main toolbar. You must backup this complete folder with all its files and sub-folders.

You can switch calibre to using a backed up library folder by simply clicking the calibre icon on the toolbar and choosing your backup library folder. A backed up library folder backs up your custom columns and saved searches as well as all your books and metadata.

If you want to backup the calibre configuration/plugins, you have to backup the config folder. You can find this config folder via Preferences → Miscellaneous. Note that restoring configuration folders is not officially supported, but should work in most cases. Just copy the contents of the backup folder into the current configuration folder to restore.

Hoe kan ik gekochte EPUB boeken gebruiken met Calibre? (of wat ik doen met .ascm bestanden)?

Most purchased EPUB books have DRM. This prevents calibre from opening them. You can still use calibre to store and transfer them to your e-book reader. First, you must authorize your reader on a Windows machine with Adobe Digital Editions. Once this is done, EPUB books transferred with calibre will work fine on your reader. When you purchase an epub book from a website, you will get an “.acsm” file. This file should be opened with Adobe Digital Editions, which will then download the actual “.epub” e-book. The e-book file will be stored in the folder “My Digital Editions”, from where you can add it to calibre.

Ik krijg een “Toegang geweigerd” fout?

A permissie foutmelding kan gebeuren vanwege diverse redenen, geen enkel heeft te maken met Calibre.

  • Je kan permissie fouten krijgen als je een SD kaart gebruikt met schrijfbeveiliging.

  • On macOS if you get permission errors when connecting a device to calibre, you can fix that by looking under System Preferences > Security and Privacy > Privacy > Files and Folders.

  • If you, or some program you used changed the file permissions of the files in question to read only.

  • If there is a filesystem error on the device which caused your operating system to mount the filesystem in read only mode or mark a particular file as read only pending recovery.

  • If the files have their owner set to a user other than you.

  • Als je bestand open is in een ander programma.

  • If the file resides on a device, you may have reached the limit of a maximum of 256 files in the root of the device. In this case you need to reformat the device/sd card referred to in the error message with a FAT32 filesystem, or delete some files from the SD card/device memory.

You will need to fix the underlying cause of the permissions error before resuming to use calibre. Read the error message carefully, see what file it points to and fix the permissions on that file or its containing folders.

Hoe kan ik de metadata van de metagegevens lezen op mijn lezer?

Most readers do not support this. You should complain to the manufacturer about it and hopefully if enough people complain, things will change. In the meantime, you can insert the metadata, including comments into a “Jacket page” at the start of the e-book, by using the option to “Insert metadata as page at start of book” during conversion. The option is found in the Structure detection section of the conversion settings. Note that for this to have effect you have to convert the book. If your book is already in a format that does not need conversion, you can convert from that format to the same format.

Another alternative is to create a catalog in e-book form containing a listing of all the books in your calibre library, with their metadata. Click-and-hold the Convert button to access the catalog creation tool. And before you ask, no you cannot have the catalog “link directly to” books on your reader.

Hoe kan ik Calibre instellen om mijn HTTP proxy te gebruiken?

By default, calibre uses whatever proxy settings are set in your OS. Sometimes these are incorrect, for example, on Windows if you don’t use Microsoft Edge then the proxy settings may not be up to date. You can tell calibre to use a particular proxy server by setting the http_proxy and https_proxy environment variables. The format of the variable is: http://username:password@servername you should ask your network administrator to give you the correct value for this variable. Note that calibre only supports HTTP proxies not SOCKS proxies. You can see the current proxies used by calibre in Preferences->Miscellaneous.

Ik wil nieuwe functionaliteit toevoegen aan Calibre. Wat kan ik doen?

U heeft twee keuzes:

  1. Create a patch by hacking on calibre and send it to me for review and inclusion. See Development.

  2. Open a bug requesting the feature. Remember that while you may think your feature request is extremely important/essential, calibre developers might not agree. Fortunately, calibre is open source, which means you always have the option of implementing your feature yourself, or hiring someone to do it for you. Furthermore, calibre has a comprehensive plugin architecture, so you might be able to develop your feature as a plugin, see Uw eigen plugins schrijven om de functionaliteit van calibre uit te breiden.

Waarom heeft Calibre geen automatische updates?

Om vele redenen:

  • Er is geen noodzaak om iedere week te updaten. Als je tevreden bent hoe Calibre werkt, kun je de automatische waarschuwing afzetten. Controleer of je wenst up te daten, één keer per jaar of zo. Er is een check box om de waarschuwing af te zetten, als je klikt op de waarschuwing zelf.

  • calibre downloads currently use about 150TB of bandwidth a month. Implementing automatic updates would greatly increase that and end up costing thousands of dollars a month, which someone has to pay.

  • Als ik een dialoog implementeer dat de updates download en het uitvoert, in plaats van manueel van de website te downloaden, zou de meest hardnekkige Calibre updater, tenminste vijf muisklikken per week besparen. Er zijn belangrijker prioriteiten te doen met de ontwikkeling van Calibre.

  • Als je echt, maar dan ook echt haat om iedere week een nieuwe versie van Calibre te downloaden, maar steeds de aller laatste versie wenst te gebruiken, raad ik je aan om de bron code te downloaden, hetgaan dat updates trivaal maakt. Instructies zijn hier beschikbaar: available here.

  • There are third party automatic updaters for calibre made by calibre users in the calibre forum.

Hoe zit het met de licentie van Calibre?

calibre is licensed under the GNU General Public License v3 (an open source license). This means that you are free to redistribute calibre as long as you make the source code available. So if you want to put calibre on a CD with your product, you must also put the calibre source code on the CD. The source code is available for download. You are free to use the results of conversions from calibre however you want. You cannot use either code or libraries from calibre in your software without making your software open source. For details, see The GNU GPL v3.

Hoe start ik Calibre van mijn USB stick?

A portable version of calibre is available here.

How do I run parts of calibre like news download and the Content server on my own Linux server?

First, you must install calibre onto your Linux server. If your server is using a modern Linux distribution, you should have no problems installing calibre onto it.

Notitie

calibre needs GLIBC >= 2.31 and libstdc++ >= 6.0.28. If you have an older server, you will either need to compile these from source, or use calibre 3.48 which requires GLIBC >= 2.17 or 2.85.1 which requires GLIBC >= 2.13 or calibre 1.48 which requires only GLIBC >= 2.10. In addition, although the calibre command line utilities do not need a running X server, some of them do require the X server libraries to be installed on your system. This is because of Qt, which is used for various image processing tasks, and links against these libraries. If you get an ImportError about some Qt modules, you are likely missing some X libraries. Typical candidates are: libxcb-cursor0, libxcb-xinerama0, libegl1, libopengl0.

U kunt de Calibre server draaien met het commando:

/opt/calibre/calibre-server /path/to/the/library/you/want/to/share

You can download news and convert it into an e-book with the command:

/opt/calibre/ebook-convert "Title of news source.recipe" outputfile.epub

If you want to generate MOBI, use outputfile.mobi instead and use --output-profile kindle.

U kunt de gedownload nieuws e-mailen met het commando:

/opt/calibre/calibre-smtp

Ik laat het uitvogelen van de exacte commando’s als een opgave voor de lezer.

Ten slotte kunt u al het gedownloade nieuws aan de Calibre bibliotheek toevoegen met:

/opt/calibre/calibredb add --with-library /path/to/library outfile.epub

Remember to read the Opdrachtpromt section of the calibre User Manual to learn more about these, and other commands.