MP4 to WebM
Turn MP4 files into WebM, ideal for embedding in websites with open codecs. Fast, free and completely private.
- Processed locally — your files never leave your device
- Free, no sign-up
- No file limits
How to use MP4 to WebM
- 1
Drop your MP4 file into the box above or click to choose it.
- 2
Check that WebM is selected as the output format.
- 3
Click Convert, then download your WebM file.
Features
- No uploadYour MP4 file is converted locally — nothing is sent to a server.
- Lossless when possibleWhen the codecs are compatible, streams are copied without re-encoding, so conversion is instant.
- Free, no watermarkNo sign-up, no watermark and no daily limits.
Frequently asked questions
Why convert MP4 to WebM?
MP4 is best for sharing and playback on every device, while WebM is ideal for embedding in websites with open codecs.
Is this MP4 to WebM converter safe?
Yes. The conversion runs entirely in your browser using ffmpeg compiled to WebAssembly, so your video stays private.
How long does it take?
Compatible files convert almost instantly. Files that need re-encoding take roughly as long as the media plays, depending on your device.