Orion Viewer - Pdf & Djvu

Orion Viewer - Pdf & Djvu is a ebook reader application developed by Michael Bogdanov, packaged as a single Android APK of version 1.0 weighing in at 10.56 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

1. Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
2. File size is a light 10.56 MB, so it installs quickly even on modest connections.
3. This build is signed by "Michael Bogdanov" — always verify the developer name matches what's listed on the app's official store page before installing an update.
4. After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
5. We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

Orion Viewer is pdf, djvu, xps, cbz and tiff file viewer for Android devices based on mupdf and DjVuLibre libraries.

Application features:

• 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

Is Orion Viewer - Pdf & Djvu free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does Orion Viewer - Pdf & Djvu require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is Orion Viewer - Pdf & Djvu safe to install?
We link to the exact APK published by Michael Bogdanov. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update Orion Viewer - Pdf & Djvu?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

1. Tap the Download APK button above and save the file to your device.
2. Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
3. Open the downloaded universe.constellation.orion.viewer.apk file from your Downloads folder.
4. Tap Install and wait for Android to finish.
5. Open «Orion Viewer - Pdf & Djvu» by Michael Bogdanov and grant only the permissions it actually needs.
6. Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.