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Orion Viewer

Orion Viewer is a free, open-source reading app for Android. Orion Viewer is pdf, djvu, xps, tiff and comic books (cbr, cbz, cbt) file viewer. It has 310 GitHub stars and is released under the GPL-3.0-or-later license, and you can install it from F-Droid and Google Play.

github.com/max-kammerer/orion-viewer (opens in a new tab)

Data as of from the GitHub API and the F-Droid index; description from the project's repository or F-Droid listing. Report an error

Get it on F-Droid (opens in a new tab)Google Play (opens in a new tab)View on GitHub (opens in a new tab)

About Orion Viewer

Orion Viewer is pdf, djvu, xps, cbz and tiff file viewer for Android devices based on mupdf and DjVuLibre libraries. Outline navigation Bookmarks support Page navigation by screen taps + Tap Zones + Key binding Text selection Single word selection by double tap with translation in external dictionary Custom zoom Custom manual and auto border crop Portrait/landscape orientation Support different navigation patterns inside page (left to right, right to left) External Dictionaries support Built-in file manager with recently opened file view

Privacy and F-Droid

F-Droid builds Orion Viewer from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.

No anti-features flagged on the latest F-Droid build.

Screenshots

  • Orion Viewer screenshot 1
  • Orion Viewer screenshot 2
  • Orion Viewer screenshot 3

Screenshots from the app's F-Droid listing.

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FAQ

Orion Viewer FAQ

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Is Orion Viewer free and open source?

Yes. Orion Viewer's source code is public on GitHub under the GPL-3.0-or-later license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.

How do I install Orion Viewer?

You can install Orion Viewer from F-Droid (package universe.constellation.orion.viewer) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: 0.97.4).

Is Orion Viewer still maintained?

The repository's most recent commit was on Oct 24, 2026. Its F-Droid listing was last updated on Oct 14, 2026. appsgit only lists apps whose repository had a commit in the last six months.