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Online-Convert vs Zamzar: catalog facts
Online-Convert	Zamzar
Free Conversions can be done for free in the browser.	Freemium Free for files up to 50 MB; larger files need a paid account.
Web, Browser extension	Web
Handles audio, video, image and document formats in one place Presets for social and messaging services	Over 1100 supported formats No account needed for small files
Files must be 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, Browser extension	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.