Convert MP4 to WebM
Produce open, royalty-free WebM video for the web from any MP4 source.
- Your MP4 file never leaves your device
- No sign-up, no watermark, no daily quota
- Handles files up to about 900 MB — your browser's memory ceiling
What happens when you convert MP4 to WebM
Produces a royalty-free WebM using VP8 video at a 1 Mbps target with Vorbis audio. WebM is the format of choice for embedding video directly in a web page with codecs free of known patent licensing requirements, and it is supported natively by every current browser.
Good for
- Embedding video on a website with a royalty-free format
- Serving a modern alternative alongside an MP4 source
- Open-source projects that need a royalty-free format
Worth knowing
- Encoding uses a fixed 1 Mbps target, so quality on busy or high-resolution footage will be lower than the MP4 source.
- VP8 encoding is slow compared with H.264 — expect this to take a while.
- Safari's WebM support is newer and less complete than other browsers'; keep an MP4 fallback.
MP4 to WebM, answered
How do I convert MP4 to WebM?
Drop your MP4 file into the box above (or click to browse), make sure WebM is selected as the target format, press Convert, then download the result.
Is this MP4 to WebM converter really private?
Yes. The conversion runs entirely in your browser — your MP4 file is never uploaded to any server, so nobody but you ever sees it.
Is converting MP4 to WebM free?
Completely free — no watermarks, no sign-up and no daily quota. Processing happens on your own device, so there are no server costs to pass on to you.
Can I convert multiple MP4 files at once?
Yes — drop as many files as you like. Convert them individually or use "Convert all", then download everything as a single ZIP.