Radar check
What we found when we opened it. Every bar is one fact, with its date.
Last code pushed 25 Oct 2026, 3 days before this check.
Latest release v0.2.4 on 6 Oct 2026.
Public since July 2026, 3 months.
1,793 stars and 64 forks.
115 commits and 29 new issues in the last 90 days.
4 contributors. 8 pull requests merged in 90 days. A small team carries it.
No security policy file says how to report a problem. No published security advisories.
How the bars are scored
- Alive. Days since the last code push: a week or less 100, a month 90, three months 70, six months 50, a year 30, eighteen months 15, older 0.
- Releases. Age of the latest GitHub release, on a similar scale; no bar when the project publishes no releases.
- Maturity. Age of the project: eight years 100, five 90, three 70, two 55, one 40, six months 25, younger 10.
- Adoption. Stars on a log scale: 100,000 stars is 100, 10,000 is 80, 1,000 is 60, 100 is 40.
- Activity. Commits in the last 90 days: 300 or more 100, 100 85, 30 65, 10 45, any 25.
- Community. People who have contributed: 100 or more 100, 30 80, 10 60, 5 40, 2 25, one 10.
- Security. A published security policy 80, none 40; published advisories are listed, not scored.
Checked by Repo Radar on 28 Oct 2026 from the repository on GitHub.
In simple English
This app lets you convert files right on your Android phone. You do not need to upload your photos, videos, or documents to an unknown website. It contains no advertisements, annoying popups, or accounts to sign up for. All the conversion work happens offline on your own device. The app is free and open source.
What it is
ZenConverter is a native Android application built with Kotlin and Jetpack Compose (a modern toolkit for building native Android user interfaces). It handles local file conversions for media, documents, fonts, and subtitles using built-in engines like FFmpeg and NCNN.
What it is good for
This is for anyone who wants to convert media or documents on their phone without paying for a subscription or trusting a sketchy web converter. It removes the privacy risk of sending personal files to third-party servers.
Summary (Key Points)from the README
Key features
- Local conversion: Files are converted on the phone, with no network transfer for conversion work.
- Broad video support: MP4, MKV, and MOV outputs use FFmpeg re-encoding, with merge, trimming, splitting, and compression presets.
- Contact sheets: Video overviews use 3×3, 3×4, 4×4, or 5×5 sample grids, exported as JPG or PNG.
- Animated GIF export: Uses at most the first 30 seconds, 30 fps, and 900 frames, with a default 480 px short-side cap.
- Image super-resolution: Offers bilinear 2×, 3×, or 4× upscaling, plus Real-ESRGAN 4× models run with Vulkan GPU acceleration.
- Frame interpolation: Provides 2× RIFE frame multiplication with on-demand model download and SHA-256 verification.
- PDF tools: Covers image-to-PDF, PDF merge, compression presets (High Quality, Balanced, Small File), text export, and password encryption and decryption.
- Font and subtitle conversion: Converts between TTF, OTF, WOFF, and WOFF2, and between SRT, VTT, LRC, and ASS.
- Metadata cleaning: Removes metadata from JPG, JPEG, and JFIF files in place, with a backup for same-image restore.
Ways to install
| Platform or method | What it needs | Effort |
|---|---|---|
| Google Play | Not stated in README | Not stated in README |
| GitHub Releases | Not stated in README | Not stated in README |
Important
- Large media: Very large media files need enough free storage, memory, and power, and the device should stay available during long foreground conversions.
- Experimental features: Video frame interpolation is experimental because mobile GPU drivers and memory vary across chipsets.
- Office limits: Office conversion is Beta, with limited layout fidelity and a 64 MiB source file cap.
- HEIC/HEIF: HEIC and HEIF decoding depends on the device's decoder.
- Dropped data: Image metadata and animation timing are not copied during image conversion.
- Not included: PDF tools do not include OCR or password cracking.
- WOFF2 platform: The bundled native Google woff2 engine is listed for arm64 only.
- Network access: The app uses the internet only for manual update checks and on-demand model or font downloads.
Written by an AI model from the project’s README; not part of the review, and it can be wrong.
- No ads, tracking accounts, or hidden paywalls.
- Performs all file conversions locally on your device without internet uploads.
- Supports a wide range of formats including video, audio, images, PDF, and fonts.
- Requires an Android phone, so it will not help desktop users.
- Large video conversions and AI upscaling can drain battery and need decent phone memory.
- AGPL-3.0 licence (a strict open-source licence that requires you to share source code if you modify and host it as a network service).
Online file conversion websites that upload your files and show ads
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Get the app from Google Play or download the APK file from the GitHub releases page to install it on your Android device.