Kosync.eu
Free KOReader Sync Server
Synchronize your reading progress, bookmarks, and page positions across all your e-readers — seamlessly and privately.
Why Kosync.eu?
Automatic Sync
Reading progress, page position, and percentage — synced automatically every time you open or close a book in KOReader.
Privacy First
No tracking, no ads, no data sharing. Your reading data stays on our servers in Europe and is never sold or analyzed for profit.
Multi-Device
Kobo, Kindle, PocketBook, Android tablets — switch between any device running KOReader and pick up right where you left off.
How It Works
Create an Account
Register with a username and password. No email required — your privacy matters.
Configure KOReader
In KOReader, go to Progress sync and set the server to https://kosync.eu. Enter your credentials.
Read and Sync
Your reading progress syncs automatically. Open the same book on another device and continue exactly where you stopped.
Supported Devices
Kobo
Clara, Libra, Sage, Elipsa
Kindle
Paperwhite, Oasis, Basic
PocketBook
Touch, InkPad, Era
Android
Phones, tablets, Boox
Any device that runs KOReader is compatible with Kosync.eu.
Frequently Asked Questions
What is KOReader?
KOReader is a free, open-source document viewer for e-ink devices. It supports EPUB, PDF, DJVU, and many other formats. It runs on Kobo, Kindle, PocketBook, Android, and Linux devices.
Is Kosync.eu free?
Yes, completely free. Kosync.eu is a community service. There are no premium tiers, no ads, and no hidden costs.
What data does Kosync.eu store?
Only what is needed for sync: your username, a hashed password, reading progress per document, and device identifiers. No email, no personal information, no reading content.
How is this different from the official KOReader sync server?
Kosync.eu is an independent, self-hosted instance running in Europe. It is fully compatible with the KOReader sync protocol and offers a web dashboard to manage your synced documents and devices.
Can I delete my account?
Yes. After signing in, you can delete your account and all associated data from the user dashboard at any time.
Ready to Sync?
Create your free account and start syncing your reading progress across all your devices in under a minute.
Get Started