Ebook reader
About this app
KOReader is an ebook reader optimized for e-ink screens. It can open many formats and provides advanced text adjustments.
See below for a selection of its many features:
• Supports both fixed page formats (PDF, DjVu, CBT, CBZ) and reflowable e-book formats (EPUB, FB2, Mobi, DOC, CHM, TXT, HTML). Scanned PDF/DjVu documents can be reflowed. Special flow directions for reading double column PDFs and manga.
• Multi-lingual user interface optimized for e-ink screens. Highly customizable reader view with complete typesetting options. Multi-lingual hyphenation dictionaries are bundled in.
• Non-Latin script support for books, including the Hebrew, Arabic, Persian, Russian, Chinese, Japanese and Korean languages.
• Unique Book Map and Page Browser features to navigate your book.
• Special multi-page highlight mode with many local and online export options.
• Can synchronize your reading progress across all your KOReader running devices.
• Integrated with Calibre, Wallabag, Wikipedia, Google Translate and other content providers.
Licensed under AGPL-3.0-only.
What's New in vv2026.03
Imported from the F-Droid repository index.
Version history
Mar 18, 2026 · 29.3 MB · Android API 18–30 · code 116543
Imported from the F-Droid repository index.
SHA-256 2a09d779a361a6b2d2a18ca52c189c51e3b9a52dceca9e9dac6423308414f91e
Mar 18, 2026 · 28.8 MB · Android API 18–30 · code 116542
Imported from the F-Droid repository index.
SHA-256 cc4369fac06a98a285b1ad12606afceff218069e526163268a829aa49cb88630
Mar 18, 2026 · 27.8 MB · Android API 18–30 · code 116541
Imported from the F-Droid repository index.
SHA-256 755f6b509846c7347ef824b2721ca65003000fbe65e01d27bb39a6e46b33fea9
Will it run on your device?
73%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be org.koreader.launcher.fdroid is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, v2026.03 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall KOReader first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of KOReader, and a listing is removed when the evidence for it stops holding up.
Get KOReader
Every source we list for org.koreader.launcher.fdroid is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
2a09d779a361a6b2d2a18ca52c189c51e3b9a52dceca9e9dac6423308414f91e
Signing certificate
8c86266c9e9191b7d02329606a5ecea7460958515462642ffec8664bb919da4d
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.