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Zamzar vs Online-Convert: catalog facts
Zamzar	Online-Convert
Freemium Free for files up to 50 MB; larger files need a paid account.	Free Conversions can be done for free in the browser.
Web	Web, Browser extension
Over 1100 supported formats No account needed for small files	Handles audio, video, image and document formats in one place Presets for social and messaging services
50 MB limit on the free tier Files are uploaded to a third-party server	Files must be uploaded to a third-party server Needs an internet connection
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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