For example, assume the field being searched contains a bad cat. If the field you are searching on is a multiple field like tags, then each tag is treated separately. For example, if your tags contain Horror, Scary , the search expression r, will not match anything because the expression will first be applied to Horror and then to Scary.
You can have calibre change the case of the result information after the replace has happened by choosing one of the functions from the Apply function after replace box. The operations available are:. Enter that case into Your test. Regular expression mode has some differences from character mode, beyond of course using regular expressions.
The first is that functions are applied to the parts of the string matched by the search string, not the entire field. The second is that functions apply to the replacement string, not to the entire field.
The third and most important is that the replace string can make reference to parts of the search string by using backreferences. Please see the All about using regular expressions in calibre for more information on backreferences. One useful pattern: assume you want to change the case of an entire field. The easiest way to do this is to use character mode, but lets further assume you want to use regular expression mode. The search expression should be. Finally, in regular expression mode you can copy values from one field to another.
Simply make the source and destination field different. The copy can replace the destination field, prepend to the field add to the front , or append to the field add at the end. If the destination is multiple e.
Search and replace is done after all the other metadata changes in the other tabs are applied. This can lead to some confusion, because the test boxes will show the information before the other changes, but the operation will be applied after the other changes. This will move these icons from the available actions list to the current actions list. Now the added buttons will be included in the toolbar you chose. In this case in the main toolbar as shown below:.
Polishing Options: Select all the e-books to be polished in the same way and then click the polish icon in the main toolbar. The following window opens up:. Many of these options were available earlier too, but to implement them you would have to convert the book again which for some e-books can be slow and CPU intensive.
The information is quite clear and I had nothing to add to it:. Similarly smarten punctuation simply converts plain text dashes, ellipsis, quotes, multiple hyphens, etc. This information is only transferred to the particular book file when you convert the book or export it.
Note there are separate buttons for updating the cover and for updating the rest of the metadata. The metadata that is updated will depend on what metadata the e-book format supports. 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. I want calibre to download news from my favorite news website. Why does calibre show only some of my fonts on macOS? The calibre E-book viewer and Edit book tools do not work on Windows? Using the viewer or doing any conversions results in a permission denied error on Windows. I downloaded the installer, but it is not working? How do I backup calibre?
Can I have the comment metadata show up on my reader? I want some feature added to calibre. What can I do? How is calibre licensed? How do I run calibre from my USB stick? How do I run parts of calibre like news download and the Content server on my own Linux server? 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 Adding your favorite news website. Otherwise, you can request a particular news site by posting in the calibre Recipes forum.
E-book files support embedding only TrueType and OpenType. Most fonts on macOS systems are in. You can obtain many such fonts on the web. Simply download the. If you get an error about calibre not being able to open a file because it is in use by another program, do the following:.
Temporarily disable your antivirus program disconnect from the Internet before doing so, to be safe. Look inside the folder you chose for your calibre library. If you see a file named metadata. Now re-install and you should be fine. Try running it as administrator Right click on the icon and select Run as administrator. At the command prompt type the following command and press Enter:. Post any output you see in a help message on the Forum. You recently connected an external monitor or TV to your computer.
Disconnect your second monitor and restart calibre. There is an incompatibility between Wacom drivers and the graphics toolkit calibre uses. Try using a non-Wacom mouse. If you are using the bit version of calibre try switching to the bit version. 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. If you have one of these, uninstall them and you will be fine. 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 only way to find the culprit is to eliminate the programs one by one and see which one is causing the issue.
Basically, stop a program, run calibre, check for crashes. If they still happen, stop another program and repeat. These two programs use hardware acceleration as they embed a version of the Chrome browser to render HTML. Try updating these first, and reboot. See this page for details. Something on your computer is preventing calibre from accessing its own temporary files. Most likely the permissions on your Temp folder are incorrect.
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. Alternately, you can run calibre as Administrator, but doing so will cause some functionality, such as drag and drop to not work.
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.
Another cause can be some third party apps that modify system behavior, such as Smart Scroll. You can obtain debug output about why calibre is not starting by running Console. Debug output will be printed to it. If the debug output contains a line that looks like:. You can clear the cache by following these instructions. 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. This is most likely the culprit if the upgrade process is hanging in the middle. Try rebooting your computer and running a registry cleaner like Wise registry cleaner. Try a clean install. Then re-install calibre.
Note that uninstalling does not touch your books or settings. 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. 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.
Make sure you are clicking the download links on the left, not the advertisements on the right. If you have the official download and your antivirus program is still claiming calibre is a virus, then, your antivirus program is wrong. 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. 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. 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. 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. A permission denied error can occur because of many possible reasons, none of them having anything to do with calibre. 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 file resides on a device, you may have reached the limit of a maximum of files in the root of the device.
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. Most readers do not support this. You should complain to the manufacturer about it and hopefully if enough people complain, things will change.
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. By default, calibre uses whatever proxy settings are set in your OS. Create a patch by hacking on calibre and send it to me for review and inclusion. See Development.
Open a bug requesting the feature. 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.
There is no need to update every week. If you are happy with how calibre works turn off the update notification and be on your merry way. Check back to see if you want to update once a year or so. There is a check box to turn off the update notification, on the update notification itself. Implementing automatic updates would greatly increase that and end up costing thousands of dollars a month, which someone has to pay. If I implement a dialog that downloads the update and launches it, instead of going to the website as it does now, that would save the most ardent calibre updater, at most five clicks a week.
There are far higher priority things to do in calibre development. If you really, really hate downloading calibre every week but still want to be up to the latest, I encourage you to run from source, which makes updating trivial. Instructions are available here. There are third party automatic updaters for calibre made by calibre users in the calibre forum. 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.
A portable version of calibre is available here. 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.
If you have an older server, you will either need to compile these from source, or use calibre 3. 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.
If you want to generate MOBI, use outputfile. Remember to read the Command Line Interface section of the calibre User Manual to learn more about these, and other commands. Navigation modules next previous Start » Frequently Asked Questions.
Change language. We just need some information from you: Complete list of e-book formats that your device supports. Note 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. Note 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. Note 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.
Note If you are concerned about giving calibre access to your email account, simply create a new free email account with GMX or Hotmail and use it only for calibre. You can repair the filesystem with: sudo fsck. Note 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.
Try upgrading the firmware on your Kobo Touch to the latest Try resetting the Kobo sometimes this cures the problem for a little while, but then it re-appears, in which case you have to reset again and again Try only putting one or two books onto the Kobo at a time and do not keep large collections on the Kobo.
So in order to see the covers on your Kindle, you have to: Send the book to the Kindle with calibre Disconnect the Kindle and wait for Amazon to destroy the cover Reconnect the Kindle to calibre.
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