Transmute – Open-source, self-hosted file converter

Summary: Transmute is a free, open-source file converter that runs on your own hardware, supporting images, video, audio, documents, fonts, and more without file size limits or watermarks. It uses FFmpeg, Pillow, Pandoc, and other tools to enable broad format conversions while maintaining privacy and control.

What it does

Transmute converts various file types including images, video, audio, documents, spreadsheets, subtitles, and fonts using self-hosted software powered by FFmpeg, Pillow, and Pandoc. It offers API access alongside a web UI and is Docker-friendly.

Who it's for

It is designed for users who require full control over file conversions and workflows without relying on third-party services.

Why it matters

It eliminates file size limits, watermarks, and privacy concerns common in online converters by enabling local, extensible file conversion.