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Online-Convert vs Transmute: catalog facts
Online-Convert	Transmute
Free Conversions can be done for free in the browser.	Free Free and open source under the MIT licence.
Web, Browser extension	Web, Self-hosted
Handles audio, video, image and document formats in one place Presets for social and messaging services	Converts many file types in one tool Files stay on your own hardware
Files must be uploaded to a third-party server Needs an internet connection	Requires running your own server A young project compared with established converters
Web application, Browser extension	Self-hosted
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.