Mobile app · Office & notes

Orion Viewer - Pdf & Djvu

Fast PDF, DjVu, XPS, TIFF and comic book (CBZ, CBR, CB7, CBT) viewer.

Completely free
Android
Open source

Ad-supported exit link (Clictune): an intermediate page may show for a few seconds before the official website. Direct link to the website, no intermediate page

Download from the official source

Link to the official download page, ad-supported (Clictune): an intermediate page may show for a few seconds. Direct link to the download

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by F-Droid
License: GPL-3.0+ — Open source (copyleft)confirmed by F-Droid
Open source: Yes
Commercial use: Yesconfirmed by F-Droid
Account required: not documented
Credit card required: Noconfirmed by F-Droid
Watermark: Not applicable
Ads: No
Platforms: AndroidEstablished by Android: F-Droid
Publisher: Michael Bogdanov
Latest version: 0.97.6 (4 November 2026)
Latest activity: 4 November 2026
Source code: github.com/max-kammerer/orion-viewer

Overview

Features described in its F-Droid listing: Markdown support, data import and export.

File formats mentioned: PDF, CBZ, CBR, DJVU, TIFF and WEBP.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“It also opens WebP images and Markdown files.” — F-Droid, 10 November 2026
“Bookmarks with export and import” — F-Droid, 10 November 2026

At a glance

Orion Viewer - Pdf & Djvu is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No advertising
Commercial use allowed

Sources and checks

Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 7 November 2026
Last technical check: 7 November 2026
Description from F-Droid — F-Droid (citation courte)

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