Turn WebM into universal MP4 — free, no watermark, and
100% in your browser. Your file is never uploaded.
How to convert WebM to MP4
Drop your .webm file above — it's processed locally.
For a near-lossless convert, enter a large custom MB; to shrink it too, pick a smaller target.
Click Compress video. The output is MP4 (H.264) — download it.
Why WebM → MP4?
WebM (VP8/VP9) is common for web video and screen recordings, but many phones, editors and chat apps don't
accept it. MP4/H.264 is the most compatible format available. SumoSquash re-encodes locally, so nothing is
uploaded and there's no watermark.
Why convert WebM to MP4?
MP4 plays everywhere; WebM doesn't. Same video, wider compatibility.
Is my WebM uploaded?
No — conversion runs entirely in your browser.
Can I keep full quality?
Yes — choose a large custom target size to keep the bitrate high.