ZenConverter

ZenConverter

On-phone file conversion for Android

WHO USES ITPeople shrinking a video or turning it into a GIF on the phone · Anyone stripping photo metadata before sharing · Android media-app developers

Install to use

Android converter for video, audio, images and PDFs — runs on the phone, no uploads

★ 1.4k▲ +13 / 7dlast 14 days · stars per dayhollow = no dataAs of 09-16 21:00 UTC

1,364 stars · checked on GitHub 09-15 19:35 UTC GitHub check 30 h late · 7-day +13 observed via GH Archive (as of 09-16 21:00 UTC)

BACK CATALOG

The ZenConverter app: a Material 3 conversion queue listing each file's target format and progress

TESIGN TAKE

The point is refusing the upload-first habit and publishing what works and where it breaks in a table; the price is that large videos draw on the phone's own storage, memory and battery.

AT A GLANCE

WHY IT MATTERS

Android converter apps tend to be ad-heavy or upload your file first; this one is written in Kotlin and Jetpack Compose and does every conversion inside a foreground service on the device. Video (MP4/MKV/MOV) and audio (MP3/M4A/WAV/FLAC/OPUS) are truly re-encoded with FFmpeg; it also handles images including HEIC, PDF merge, compression and encryption, TTF/OTF/WOFF2 fonts and SRT/VTT/LRC/ASS subtitles, with Real-ESRGAN upscaling on NCNN Vulkan. The INTERNET permission is used only for manual update checks and on-demand model/font downloads, and the supported routes and their limits are written down in a public support-matrix.md (v0.2.3, 2026-09-12).

BUILD FROM THIS

As AGPL source you could cut a lightweight fork that keeps only one job (say, batch WEBP conversion of product photos plus metadata stripping), and its queue design — foreground service → engine routing → save — is a reference for other Android media apps.

WHO IT'S FOR

People shrinking a video or turning it into a GIF on the phone: without a server upload
Anyone stripping photo metadata before sharing: JPGs are cleaned without re-encoding and can be restored from the backup
Android media-app developers: a Compose + foreground service + FFmpeg pipeline to study

START IN 5 MINUTES

# 1. Install from Google Play (package org.zenconverter.app) or the APK on GitHub Releases
# 2. Add files → pick the target format and options per file → the ready queue runs in a foreground service
# # Development setup is in docs/development-setup.md — no build commands in the README [확인 필요]

CAVEATS

AGPL-3.0 — the README says 'GNU AGPL v3.0 or later', the homepage 'AGPL-3.0+' (third-party libraries, native binaries and bundled fonts keep their own licences)
Android only; minimum Android version is not stated in the README [확인 필요]
Office conversion is beta (limited layout fidelity, 64 MiB source cap) and frame interpolation is experimental; large videos need free storage, memory and power

RECEIPT

SIMILAR TOOLS

Up to five from PRODUCTIVITY by ★ total: edited entries first, then repository cards; this entry is highlighted. Drawn from the same stored snapshot as the rankings — a comparison, not a recommendation. As of 09-16 21:00 UTC

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