Convert WebM to MP4
Turn WebM screen recordings and web clips into MP4s that play everywhere — privately, in your browser.
WebM is the format browsers produce: screen recordings from Chrome extensions, MediaRecorder captures from web apps, and clips saved from the web all tend to come out as .webm. Browsers play it fine — but iPhones, PowerPoint, video editors, and most non-browser software often won't touch it.
This converter re-encodes WebM's VP8/VP9 video into standard H.264 MP4 entirely in your browser. Screen recordings convert especially well: their mostly-static content compresses efficiently, so output files stay small at high quality.
How to webm to mp4 online
- 1Drop your .webm file into the box — screen recordings and downloaded clips both work.
- 2Pick a quality level; High is right for nearly everything.
- 3Click Convert to MP4 and let the progress bar run.
- 4Download an MP4 that plays on any device or editor.
Frequently asked questions
Why won't my WebM screen recording open in my video editor?
Most desktop editors (Premiere, Final Cut, even many free ones) have limited or no support for WebM's VP8/VP9 codecs. Converting to H.264 MP4 — what this tool does — makes the footage universally editable.
Does the conversion lose quality?
The video is re-encoded, so technically yes, but at CRF 21 the difference is imperceptible — especially for screen recordings, which re-encode very cleanly.
Can I convert WebM audio-only files?
This tool outputs MP4 video. For extracting just the audio track from any video file, use our MP4 to MP3 tool instead.
Is my recording uploaded anywhere?
No — conversion runs entirely in your browser via WebAssembly. Sensitive screen recordings never leave your device, which is exactly what you want for work content.
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