[Title: Ubunchu! | Author: Hiroshi Seo | Publisher: ASCII MEDIA WORKS Inc.]

KCC

Kindle Comic Converter optimizes black & white (or color) comics and manga for E-ink ereaders like Kindle, Kobo, ReMarkable, and more. Pages display in fullscreen without margins, with proper fixed layout support. KCC runs on Windows, macOS, and Linux.

Supported input formats include JPG/PNG image files in folders, archives like CBZ/EPUB, or PDF.

Supported output formats include MOBI/AZW3, EPUB, KEPUB, CBZ, PDF, and folders of images.

The absolute highest quality source files are DRM-free PDFs from Humble Bundle/Fanatical. The PDFs are often x12000 resolution or better, while even the 10" Kindle Scribe is only x2480.

KCC's main goal is maximum image quality at significantly smaller file size. For example, KCC

1. can compress a 600 MB manga volume from Humble Bundle to 100 MB. This is mostly accomplished by downscaling to the native resolution of your specific device. This can also improve battery life, page turn speed, and general performance on underpowered ereaders with small memory and storage capacities.

2. doesn't add extra margins like other software. KCC enables true fullscreen top to bottom.

[Title: Ya Boy Kongming! | Story: Yuto Yotsuba | Art: Ryo Ogawa | Publisher: Kodansha | Source: Humble Bundle]

3. fixes black levels to avoid gray/faded blacks found in many Kindle Store manga. (The original source was gray, KCC processing made it black.)

[Title: Fire Force | Author: Atsushi Ohkubo | Publisher: Kodansha | Source: Humble Bundle]

4. fixes the rainbow effect on Kaleido 3 color eink without blur using a 2D Discrete Fourier Transform:

5. can semi-automatically detect 2-page spreads from pre-split single pages:

You can view combined spreads either rotated or not:

You can view the split halves either before or after combined spreads:

Demo

Just drop your input files into the KCC window, hit convert, and USB drop the output files onto your device's documents folder!

There are a lot of options, but most people only care about the ones checked above.

Hover over each option to see details in a tooltip.

NOTE: some checkboxes can have a half-check marks.

Then all your usb loaded comic files will show up next to all your normal books in your ereader library!

Here's a quick video demo of how the process works (using expert mode):

https://github.com/user-attachments/assets/da73d625-e082-482d-91a4-ae4765e96fd7

The final result looks incredible on my 10" Kindle Scribe: https://www.youtube.com/watch?v=2CIHW2N9Enc

WARNING: Kindle Scribe 2025 MOBI support is limited, converted books may have blank pages. Use PDF instead.

If you are on macOS and use a 2022+ Kindle, you may need to use Amazon USB File Manager for Mac or OpenMTP.

YouTube tutorial (please subscribe): https://www.youtube.com/watch?v=QQ6zJcMF2Iw

Installation tutorial: https://www.youtube.com/watch?v=IR2Fhcm9658

Kindle Jailbreak for KOreader

Jailbreaking to use KOreader is optional. MOBI manga converted by KCC can be opened in Kindle’s native reader just fine

But if you jailbreak your Kindle, you'll unlock additional features like:

1. compatibility with image formats better suited for manga like dithered 4-bit PNG and WEBP. This enables better quality at half the file size compared to JPG which must be 8-bit. This is visually lossless since eink screens are 4-bit.
2. no dependency on kindlegen, which can mean twice as fast conversions since you can convert to CBZ directly.
3. You can dither by partially checking the JPG/PNG box and can crop in KCC instead of KOreader. This may increase page turn speed and battery.

Common KOreader manga mistakes: https://youtu.be/gaakIh9p8tw?si=X7OgPJlAvL9XGbLR

Set per folder setting defaults: https://youtu.be/O9p6HVWIQ6s?si=Jtx607erCBA_auWM

A word of warning

KCC is not Amazon's Kindle Comic Creator nor is in any way endorsed by Amazon. Amazon's tool is for comic publishers and involves a lot of manual effort, while KCC is for comic/manga readers. KC2 in no way is a replacement for KCC so you can be quite confident we are going to carry on developing our little monster ;-)

Issues / new features / donations

If you have general questions about usage, feedback etc. please post it here. If you have some technical problems using KCC please file an issue here. If you can fix an open issue, fork & make a pull request.

If you find KCC valuable you can consider donating to the authors:

• Ciro Mattia Gonano (founder, active 2012-2014):

• Paweł Jastrzębski (active 2013-2019):

This is the beginning of the README. Read the rest at the original. Read the full README ↗