How to convert comic files (cbr/cbz) to epub for e-readers

Comic files (CBR/CBZ) don’t work on most e-readers natively. Here’s how to convert them.

Understanding Comic Formats

Format	Type	Notes
CBR	RAR archive	Older format, less common
CBZ	ZIP archive	More common, easier to work with
EPUB with images	Reflowable	Works on all e-readers
PDF	Fixed layout	Best for large screens

Method 1: Using Calibre

Step 1: Install Calibre

Download from calibre-ebook.com (free, cross-platform).

Step 2: Install Comic Input Plugin

1. Calibre → Preferences → Plugins
2. Click Get new plugins
3. Search for Comic Input
4. Install and restart Calibre

Step 3: Convert

1. Add your CBR/CBZ file to Calibre
2. Select the book → Convert Books → Convert Individually
3. Set output to EPUB
4. In the Page Setup tab, set output profile to your device
5. Click OK

Method 2: Using Kindle Comic Converter

KCC (Kindle Comic Converter) is a dedicated tool:

1. Download from github.com/ciromattia/kcc
2. Open your CBR/CBZ file
3. Choose output format (EPUB, MOBI, or CBZ)
4. Select your target device
5. Click Convert

KCC optimizes images for e-ink screens — better results than Calibre.

Method 3: Manual Conversion

For advanced users:

1. Extract CBR/CBZ to a folder (use 7-Zip or similar)
2. Re-package as EPUB using Sigil or similar tools
3. Adjust image sizes for your device screen

Best Settings for Comic Conversion

Target Device	Format	Image Width	Image Quality
Kindle Paperwhite	EPUB	1072 px	80%
Kindle Scribe	EPUB	1404 px	85%
Kobo Libra Colour	EPUB	1264 px	85%
BOOX Tab Ultra	EPUB or PDF	1404 px	90%

Tips for Best Results

• Use panel view — KCC can split pages into panels
• Reduce image size — 80% quality is indistinguishable from 100% on e-ink
• Convert to grayscale for Kindle/Kobo (unless you have a color model)
• Test one chapter before converting the entire series