Your private universe of reading.
A peaceful digital reader for your PDF and EPUB files, paired with a minimalist social circle to share reading milestones with friends.
100% Private Files
Your book files stay on your device. Only public metadata is shared.
PDF & EPUB Engine
Dark mode, sepia paper, automatic cloud progress saving.
Mutual Friends Feed
Follow friends, celebrate milestones and share book recommendations.
How Librarius Works
Three core principles that keep your reading quiet, private, and yours.
1. Upload & Pair by Title
Drop your PDF or EPUB. Librarius searches public book archives (Open Library & Google Books) so you can pair it with genuine cover art, author names, and ratings with one tap.
2. Privacy by Design (Local Files)
Your books are never uploaded to our servers. Files reside safely in your device's browser database (IndexedDB). Your reading material is strictly yours.
3. Seamless Multi-Device Sync
Because files stay private to each machine, reading on a new laptop or phone takes one instant step: select your local file once to reconnect, and your cloud reading progress picks up exactly where you left off.