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Convertio vs Zamzar: catalog facts
Convertio	Zamzar
Freemium Free conversions in the browser, with paid plans for heavier use.	Freemium Free for files up to 50 MB; larger files need a paid account.
Web	Web
More than 300 supported formats in one place Advanced options for many conversion types	Over 1100 supported formats No account needed for small files
Files are uploaded to a third-party server Needs an internet connection	50 MB limit on the free tier Files are uploaded to a third-party server
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account 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.