Is Kindle Comic Converter Safe? How to Tell You Have the Real One

Yes — Kindle Comic Converter (KCC) is safe. It is a free, open-source project whose complete source code is public at github.com/ciromattia/kcc, where it has been maintained in the open for over a decade. Anyone can read exactly what the program does, and thousands of people do. The only real safety question is not "is KCC safe" but "did I actually download KCC" — because popular free tools attract copycat download pages, and a repackaged installer from a random site can contain anything.

Why open source settles the question

Closed-source freeware asks you to trust a stranger's binary. KCC doesn't: the code that resizes your pages, sets manga direction and writes the EPUB is published line by line, and the releases are built from that public code. A program cannot hide spyware in source code that anyone can audit, fork and rebuild. That's the strongest safety guarantee software can offer, and it's why KCC has been the community's reference comic converter for years.

The project is also just a file converter. It reads the CBZ/CBR/PDF you give it and writes a new file. It has no reason to touch anything else on your system, and the source confirms it doesn't.

The one rule: download from the official GitHub

Every KCC release for Windows, macOS and Linux is published on the official repository's releases page. That is the only place to get it:

1. Go to github.com/ciromattia/kcc.
2. Open the Releases section.
3. Download the installer for your platform.

Skip search-ads and third-party download portals entirely. Sites that re-host free software sometimes wrap it in their own installer with bundled extras — and at that point you're no longer running the audited open-source project, you're running whatever the re-hoster added.

About that Windows SmartScreen warning

On Windows, you may see a SmartScreen prompt when launching the installer. That's normal for independent open-source software: the warning reflects that the binary isn't from a large registered publisher, not that anything malicious was found (checked August 2026). If your download came from the official GitHub releases page, you can proceed. If it came from anywhere else, stop and get it from GitHub instead.

The zero-install option

If installing desktop software is off the table — a work laptop, a Chromebook, a phone, or simply caution — you can run the same conversion without installing anything. MangaConverter runs the open-source KCC engine as a website:

• Nothing executes on your machine beyond the browser tab.
• Uploaded files are deleted automatically after 24 hours.
• It's free, with a live preview so you see the converted pages before downloading.
• Inputs cover CBZ, CBR, CB7, ZIP, RAR, 7Z, PDF and EPUB; outputs include EPUB, KEPUB, MOBI and CBZ.

The web engine itself is open source too, and self-hostable if you want the browser convenience with full control: kcc-cloud on GitHub.

Quick safety checklist

• Official desktop KCC from GitHub: safe, open source, auditable.
• KCC from a third-party download site: unnecessary risk — you can't know what was added. Get the GitHub build instead.
• Browser conversion: nothing to install, so nothing to vet; make sure the service states how long it keeps your files (MangaConverter deletes them after 24 hours).
• Your comic files: conversion doesn't alter your originals; KCC writes a new output file and leaves the source untouched.

Where to go from here

Once you have a trustworthy copy, the actual converting is the easy part. Our Kindle Comic Converter guide walks through device profiles and manga mode, and Kindle manga converter settings covers the options that matter for readable pages. If you just want the result, convert a CBZ to EPUB in the browser and send it to your device.