RTranslator provides real-time translation on Android through an open source mobile application.
Open source
24 alternativesOffline Translator
Offline Translator uses Firefox translation models for on-device translation, processing supported text locally on Android.
About Offline Translator
Offline Translator is an open-source Android app that translates text, PDF/ODT documents and images using on-device models. It uses Firefox translation models for translation, PaddleOCR for image text, and cld2 for automatic language detection, with transliteration for non-Latin scripts and a built-in dictionary based on Wiktionary data. Language packs containing the full models are downloaded once, after which translation happens on the device and, per the project, is processed without requests to external servers. Roughly 60 languages are listed, including Arabic, Chinese, Japanese, Korean, Hindi and most European languages.
Key features
- Translate shared text, links, images or documents from other apps
- Mini popup translation via long-press on text in other apps
- Automatic language detection and transliteration for non-Latin scripts
- Built-in word dictionary; a separate kanji dictionary for Japanese
- Text-to-speech with selectable voices and adjustable speed
- Exposes an API so other apps can request translations
Best for: Android users who want text, document and image translation processed on the device rather than sent to a translation service.
Good for
- Open source, with the repository mirrored to Codeberg
- Language packs are downloaded once and translation then runs offline
- Published SHA-256 hash of the signing certificate for APK verification
Watch out for
- Android only
- Language packs must be obtained first; manual file placement is needed on devices without internet access
- Pricing is not stated on the repository page
Offline Translator at a glance
- Category
- Mobile Apps › Android Apps
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Android
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Offline Translator FAQ
How do I use the app on a device with no internet access?
Place the language files in Documents/dev.davidv.translator on the device; the repository's OFFLINE_SETUP.md gives the details.
Can other apps use it for translation?
Yes. The app exposes an API, documented in ITranslationService.aidl, that other apps can call to request translations.
Does translation require an internet connection?
No, once the language packs are downloaded. The models are stored locally and translation runs on the device.
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