Transmute
Transmute provides self-hosted file conversion and compression for images, video, audio, documents, spreadsheets, subtitles, and fonts.
About Transmute
Transmute is self-hosted software for converting and compressing files on a server you control. Its maintainers describe it as built for privacy and automation. It suits people who want files processed without being sent to a third party, and who are willing to run the server themselves.
Pricing is not clearly stated.
Key features
- Compresses supported files to make them smaller
- OIDC and SSO login through providers such as Authentik
- Built-in user accounts, role-based access and API keys
- REST API with OpenAPI documentation for automation
- One-command Docker deployment
- Seven built-in light and dark UI themes
Best for: Users who want to automate file conversions through the built-in REST API on their own server.
Good for
- No file size limits, so the practical limit is your storage
Watch out for
- Designed for trusted networks, so public internet exposure needs extra setup
- The maintainers say it is not yet up to par with the hosted services they compare it to
- You need your own server to host and run it
Transmute at a glance
- Category
- Software & Utilities › File Utilities
- Type
- App
- Pricing
- Not confirmed. Check the site
- Details verified
- Oct 22, 2026 · Official source
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for File Utilities
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Transmute FAQ
Where is the setup guide?
The Getting Started guide is on the project website at transmute.sh.
Where are the API docs?
When the app is running, the API docs are at port 3313 under /api/docs.
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