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27 votes

How can I reduce the resolution of images in an epub or mobi file?

Calibre already offers this functionality without any plugin. It's part of the ebook editor that installs with Calibre. The editor will only edit files in the epub or azw3 format though. You can ...
ChoiceD's user avatar
  • 371
12 votes
Accepted

How do I prevent Calibre from modifying EPUB files when I read them?

I hadn't looked before so I did a little investigating. With Calibre 4.23 on Linux, I found that it's not exactly Calibre, it's the Reader. I don't know why this Reader (it's a newly re-written reader,...
user10216038's user avatar
9 votes
Accepted

Calibre ignoring font settings?

If the ebook contains some definitions about the fonts to use, it takes the precedence over the default Calibre settings. Maybe the ebook you are reading has some CSS rules that define the default ...
Sekhemty's user avatar
  • 6,174
7 votes

Calibre ignoring font settings?

The most canonical way to set styles globally is to set them in the Styles section. The basic set of styles for changing fonts are simply: body { font-family: Crimson; } h1, h2, h3, h4, h5, h6 { color:...
HaoZeke's user avatar
  • 181
7 votes

Calibre ignoring font settings?

Some EPUBs may have font information specified directly as inline CSS. It will have preference over more generic options. In that case you can convert eBook and strip font-related styling:
ᄂ ᄀ's user avatar
  • 171
7 votes
Accepted

Ebooks file naming scheme -- Books in a series

If you are using Calibre, its database is already set to have each piece of information about a book in its proper field (i.e., there will be a field for the title, another for the author, another one ...
Sekhemty's user avatar
  • 6,174
5 votes

Trouble hooking up Goodreads with sideloaded ebook on Kindle Paperwhite

Here is a simplified solution for you. • Add your book to Calibre • Convert it to .azw3 • Download metadata for the right version • Make sure in the "ids" box you have the id from amazon.com (as ...
Mitu Bút Chì's user avatar
5 votes
Accepted

Can I only transfer files to my Kindle Paperwhite using the cable that shipped with the device?

Additionally, there are some USB cables that are with charge-only feature. They have less pins, usually a lot cheaper or come with devices that are not made for a pc-device storage connection. For ...
Непитерская Кошка's user avatar
5 votes

Calibre: Author with the word "and" in the name?

You can change default behaviour in Preferences/Tweaks: # Splitting multiple author names The default setting is: authors_split_regex = ',?\s+(and|with)\s+' When you clear that, Calibre won't split ...
exim's user avatar
  • 151
5 votes

How to sort on books that aren't in a specific format in calibre

I'm surprised nobody has responded in six months, sorry I haven't been here :-( I do this all the time. You want to convert everything that has formats:"=PDF" and doesn't have formats:"=MOBI". ...
Auspex's user avatar
  • 502
5 votes
Accepted

How can I reduce the resolution of images in an epub or mobi file?

I had a similar situation: a 134 MB .mobi that I wanted to shrink. Here's how I reduced the file size to 26 MB. The key to this approach is that an .epub is actually just a zipped web page with ...
Matt Greene's user avatar
5 votes

How can I reduce the resolution of images in an epub or mobi file?

Note: I intended to leave this as a comment for @mosh but didn't have the necessary rep. This is my own personal solution based on the solution he outlined. This will recursively scan a specified ...
justathoughtor2's user avatar
4 votes

Can I create my own ebook cloud with Calibre?

Alternatively, if you have a server available, with PHP, you can install COPS (https://github.com/seblucas/cops/releases) on the server, and use rsync to regularly copy your entire Calibre directory ...
Auspex's user avatar
  • 502
4 votes

Calibre to Kindle Book Transfer

Increasing font size and spacing is a frequent problem for PDFs, especially for tablets that are 6 inch. PDFs are supposed to be printable documents, and so font size and other things tend to be fixed ...
idiotprogrammer's user avatar
4 votes

How can I reduce the resolution of images in an epub or mobi file?

bash script to for bulk compressing images in big.epub to small.epub on Windows7 or Linux. You need to install cygwin on windows for (bash, unzip, zip, find, imagemagick). #!/usr/bin/bash USAGE="...
mosh's user avatar
  • 141
4 votes

Can a custom column with "Date" type be added to the tag browser?

Yes, you can accomplish that using SubGroups in Calibre. The way to do a subgroup is described here (for user entered Genres) but I'll do the TL;DR below for how to do it with publication dates: https:...
GaetaWoo's user avatar
  • 141
4 votes
Accepted

How to change text alignment with Calibre book editor

You can use a CSS style to apply this formatting to all your text: body { text-align: left; } This rule will be applied to all your text, so it will affect both regular paragraphs (<p> and ...
Sekhemty's user avatar
  • 6,174
4 votes
Accepted

How Does Amazon Kindle Renting work on *buntu/Linux Systems?

Perhaps renting works differently from buying/lending/borrowing ebooks, but all you do is to download the Kindle reading app on your device. Then, the rented item will magically appear after you ...
idiotprogrammer's user avatar
3 votes
Accepted

Calibre ebook viewer - Apply User Stylesheet to Full Screen Mode

Paste the following in the 'User stylesheet', click ok. Then go to 'Theming' and save the style with whatever name you like. The e-book will display nicely in any screen mode and there are a couple of ...
michael biller's user avatar
3 votes

Calibre ignoring font settings?

A simple solution is go to Preference - Styles Put this piece of code in it * { font-family: "The font you want" !important; } It's not a beautiful solution but easily works. So you can ...
ding van's user avatar
  • 151
3 votes

How to automatically hyphenate before sending to a device?

Hyphenating a text that is not in a fixed presentation (page shape, or ratio page size/ font size) makes little sense as the words may change position on a line. Hence, I am assuming that what you ...
babou's user avatar
  • 1,212
3 votes

Can I create my own ebook cloud with Calibre?

You can definitely create your own eBook library by combining Calibre with other solutions to ensure your books, highlights and comments are reliably accessible online which would require a lot of ...
Skillachie's user avatar
3 votes

Clean up converted ebook

In Calibre you can play around Heuristic Processing option while converting your files.
Valery Noname's user avatar
3 votes
Accepted

Calibre viewer displays books wrong

When the DjVu support for Calibre was added a few years ago, it was implemented by taking the text layer, when available, and extract and convert that to textual material usable for conversion, by ...
Anthon's user avatar
  • 7,641
3 votes

How can I reduce the resolution of images in an epub or mobi file?

Here is a Python script I use to automate reducing the size of epub books: https://github.com/murrple-1/epub-shrink Example usage: $ python epub-shrink/app.py input_file.epub output_file.epub --jpeg-...
hoju's user avatar
  • 131
3 votes
Accepted

Within Calibre, is it possible to set a hierarchy on the series field?

According to the Calibre manual, the series field, amongst many other, supports a hierarchy by using a dot between the parent and children tag. This behavior should be enabled in the options panel:
Sekhemty's user avatar
  • 6,174
3 votes

Version control for writing ebooks

Git can be used, but if you use with epub, or any other kind of archive files then you will not get a meaningful diff between versions, just store each version of the ebook. You can use Git wit ...
Bence László's user avatar

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