MP4 to WEBM Video Converter
Drop your MP4 files — the WEBM video is generated in your browser in seconds. Multiple files at once, no upload on the fast path.
9,214+ video files converted
Need your video as WebM? Drop the files and they are re-encoded right on this page — no install, no sign-up, no queue. Typical WebM output is ~8 MB/min @1080p, and the work happens locally so your video stays on your machine.
Looking to programmatically convert MP4 to WEBM?
Same engine, available as a JSON API. Drop a file or URL via REST and get the converted video back — no browser, no UI, no rate limits on paid tiers.
Fast response on common video pairs
Webhook delivery for batch jobs
Dozens of video format pairs supported
MP4 vs WEBM: how they compare
The numbers and capabilities at a glance, so you know what you're trading.
MP4
- Year released
- 2001
- Compression
- H.264 (lossy)
- Transparency
- No
- Animation
- Yes (video)
- Browser support
- Universal
- Best for
- Sharing & streaming everywhere
WebM
- Year released
- 2010
- Compression
- VP9 (lossy)
- Transparency
- Yes (alpha)
- Animation
- Yes (video)
- Browser support
- Modern browsers
- Best for
- Web embedding, open source
Heads up before converting to WebM
What this specific conversion changes about your video.
Lossless when the codecs already fit
If your MP4 uses codecs WEBM accepts, we remux (rewrap) it losslessly and instantly. A codec change re-encodes, which recompresses slightly.
Best practices for WebM
Small choices that keep your output sounding right.
- Play the WEBM result back before deleting your original MP4.
- Pick a preset (Web, Mobile, High quality) to balance size and quality for your WEBM.
The importance of a good video conversion
Why getting MP4 → WEBM right matters more than you think.
Convert MP4 to other formats
Convert other formats to WEBM