Convert MP4 to WebM
Free, private MP4 to WebM conversion - processed entirely in your browser, nothing is uploaded.
WebM with VP8/VP9 is the open, royalty-free video format the web standardized on - it's what you want for HTML5 video embeds where bandwidth matters, and for platforms that prefer open codecs. At comparable quality WebM files often come out smaller than H.264 MP4s, which speeds up page loads. Conversion happens entirely in your browser.
Drop a video here
or click to browse. Convert between MP4, WebM, MOV, MKV, and AVI.
Frequently asked questions
When should I use WebM instead of MP4?
Use WebM for videos embedded on web pages you control - it's smaller and every modern browser plays it. Stick with MP4 when the file needs to work in email, iMessage, editing software, or on older devices.
Does WebM support transparency?
VP9 WebM can carry an alpha channel, which MP4/H.264 cannot - that's why animated overlays for streaming are usually WebM. This converter targets standard opaque video; transparency workflows need a dedicated pipeline.
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Convert Video
All formats - MP4, WebM, MOV, MKV, and AVI