FileTranslator › MP4 to WebM
Convert MP4 to WebM
WebM is the open, royalty-free video format of the web platform — preferred for HTML5 embedding and required by some open-source projects and platforms.
Drop MP4 files here
or
Output is pre-set to WebM — you can change it per file after adding.
About MP4 to WebM conversion
Your MP4 is re-encoded to VP8 WebM with Vorbis audio, entirely on your device. Encoding to WebM is slow by nature, so it is best suited to shorter clips.
Good to know: VP8 encoding in the browser is slow — significantly slower than real time. Short clips are fine; feature-length files are better done in a desktop app.
How to convert MP4 to WebM
- Drop your MP4 file onto the box above, or click Choose files.
- The output format is already set to WebM — adjust it per file if you need something else.
- Click Convert, then download your WebM file.
Free, no account, no watermarks — and because the conversion runs in your browser, your files are never uploaded to a server.
MP4 to WebM — frequently asked questions
How do I convert MP4 to WebM?
Drop your MP4 file onto the converter above (or click Choose files), make sure the output format is set to WebM — it is preselected on this page — then click Convert and download the result.
Is this MP4 to WebM converter free?
Yes. Converting MP4 to WebM on FileTranslator is completely free, with no account, no file limit and no watermarks. The site is supported by ads instead of fees.
Are my MP4 files uploaded to a server?
No. The conversion from MP4 to WebM runs entirely in your browser using WebAssembly and JavaScript — your files never leave your device, which makes it safe for private documents and photos.
What should I know before converting MP4 to WebM?
VP8 encoding in the browser is slow — significantly slower than real time. Short clips are fine; feature-length files are better done in a desktop app.