KCC is a comic and manga converter for e-ink ereaders that optimizes content for devices like Kindle, Kobo, ReMarkable, and KOreader.
The tool addresses the problem that most manga conversion methods add margins, forcing readers to zoom or scroll. KCC enables true fullscreen display from top to bottom by downscaling high-resolution source files to match each device's native resolution. It accepts JPG, PNG, CBZ, EPUB, and PDF inputs and outputs to MOBI, AZW3, EPUB, KEPUB, CBZ, PDF, or image folders. Beyond fullscreen layout, the tool fixes black levels to eliminate the gray or faded blacks common in Kindle Store manga, corrects the rainbow effect on Kaleido 3 color e-ink displays without introducing blur, and can semi-automatically detect and reconstruct two-page spreads from pre-split single pages. File compression is substantial—a 600 MB manga volume can be reduced to 100 MB while maintaining quality.
Adopt this tool if you regularly read comics or manga on e-ink devices and want to maximize image quality while minimizing file size and improving device performance. It suits anyone with high-resolution source material, particularly DRM-free PDFs from sources like Humble Bundle. The tool runs on Windows, macOS, and Linux with a graphical interface that exposes many options but highlights the most commonly used settings by default. The README notes that while MOBI manga converted by KCC work in Kindle's native reader, jailbreaking to use KOreader unlocks additional features, though this is optional.
Development activity shows consistent engagement with user-reported issues and feature requests. The project maintains active support across multiple platforms and regularly addresses device-specific quirks, such as the Kindle Scribe 2025 MOBI limitation and macOS compatibility with newer Kindle models. The maintainer provides video tutorials and documentation to help users through installation and conversion workflows.
