WebM to MP4 Converter (and MP4 to WebM)
Client-Side SecureConvert WebM ↔ MP4 and trim clips in your browser using FFmpeg.wasm. Perfect for screen recordings and quick edits.
Video Converter
Convert WebM ↔ MP4 and trim clips locally.
Drop a WebM or MP4 file
Nothing is uploaded. Processing stays in your browser.
Leave blank to keep the full video.
Quick Tips
- Convert WebM from the Screen Recorder into MP4 for editors or Slack.
- Use start/end times to cut out intros or dead air without re-uploading.
- Large files may take a minute. Keep this tab open during processing.
Is this tool broken?
Let us know if you found a bug or have a feature request.
WebM ⇄ MP4 Converter (Trim Included)
Convert screen recordings or any video between WebM and MP4 without uploading. Clip the start or end in your browser using FFmpeg.wasm.
Perfect for turning .webm recordings into MP4 for editors, or exporting MP4 to lightweight WebM. Everything runs locally for speed and privacy.
WebM ↔ MP4
Keep compatibility for editors, social apps, and browsers with a single click.
Trim Quickly
Cut the start or end with timestamps like 30, 1:20, or 00:02:15.
Private by Design
Processing happens locally on your device. No uploads, accounts, or watermarks.
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