Lumen Reader
Lumen

Library

Your library is empty
Add a PDF. We’ll handle the boring bit.

Typeface

AA

Theme

Translate highlights

Translate on select
Turn this on to translate selected text. On-device if your browser can; otherwise online. Online means internet, possible limits, and sending the passage to the service. Saved translations stay with the highlight.

Highlights

Lumen ReaderPreparing…

Backup & Restore

Take your library with you. Includes text, notes, highlights, bookmarks, settings, progress, Removed Books, and PDFs stored here.

Restore this backup?

Pick a backup. Check what’s inside. Then restore.

0 books0 original PDFs
Backups stay in your chosen file location.

Vault health

Check storage. Manage snapshots.

Checking storage…
Recovery snapshots 0 saved
No safety snapshots yet. Make one before you poke around.

Three snapshots max. Each keeps local books, notes, settings, progress, and stored PDFs. If a safe copy can’t be saved, restore is blocked. Sensible, really.

Restore updates matching books and leaves the rest alone. A safety snapshot comes first. Backup files are readable, so don’t leave them lying around.
Lumen Reader · Version 5.4

What do we call you?

Change it later. Obviously.