WebM to MP4 Converter
Convert WebM videos and screen recordings to MP4.
Browser RAM • 0 Uploads
Engine: FFmpeg WebAssemblyFormats: WEBMMax Guide: 150MB RAM
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Zero-Upload In-Browser Execution GuaranteeVerified Local RAM
Processed directly on your device. Nothing is uploaded. This tool uses native Web APIs, Canvas, and client-side WebAssembly to process your files inside local browser RAM. No server receives your file, no telemetry logs your data, and no account is required.
Key Capabilities
- Perfect for converting browser screen recordings (OBS / Chrome recordings)
- Transcodes VP8/VP9 and Opus to standard H.264 and AAC
- Integrated video player preview
How To Use
1
Select WebM
Drop your .webm video or screen recording.
2
Transcode
Click Convert to run client-side FFmpeg.
3
Save MP4
Download the converted MP4.
Frequently Asked Questions
Why do screen recordings save as WebM?
Many browser recording APIs output WebM by default. Converting to MP4 makes them easy to edit in Premiere, Final Cut, or share on mobile.