Free browser tool
Free WebM to MP4 Converter
Convert WebM to MP4 in seconds — no upload, no sign-up, no watermark. Perfect for screen recordings, OBS exports, and browser video files. Everything runs privately in your browser.
- No upload
- No sign-up
- No watermark
- No quality loss
Drop a video here or click to browse
MOV, MKV, AVI, WebM → MP4 — converted locally in your browser
Sponsored by the makers
Tired of boring screen recordings?
Try Screen Charm.
Auto-zoom, motion blur, camera overlay, and background music. All built in. Record once, export a polished video.
See what it doesHow to convert WebM to MP4 online
Drop your WebM file
Select or drag in your WebM file. Processing is local — nothing is sent to a server.
Auto-convert
FFmpeg remuxes or re-encodes the file. Stream copy is tried first for zero quality loss.
Download MP4
Click Download. The MP4 is ready for any player, editor, or social media upload.
Why convert WebM to MP4?
Play on any device
MP4 works everywhere — Windows, macOS, iPhone, Android, smart TVs. WebM is only natively supported in Chrome and Firefox.
Upload to social media
YouTube, Twitter/X, LinkedIn, Instagram, and TikTok all accept MP4. WebM often triggers re-encoding or upload errors.
Open in any video editor
Final Cut Pro, Premiere, DaVinci Resolve, and iMovie all support MP4 natively. WebM support varies and often requires plugins.
Share easily
MP4 files can be attached to emails, embedded in documents, and shared via Slack or Notion without compatibility warnings.
Frequently Asked Questions
How do I convert WebM to MP4 online for free?
Drop your WebM file into the converter or click to browse. Conversion runs locally in your browser — no upload, no sign-up, no watermark. Click Download when done.
What is a WebM file?
WebM is Google's open video format used for web video, browser-based screen recordings, and video conferencing exports. It works in Chrome and Firefox but not in QuickTime, most editors, or social media upload tools.
Will I lose quality when converting WebM to MP4?
The converter tries stream copy first — no re-encoding, no quality loss. If needed it falls back to H.264 + AAC, which is visually lossless.
Is my video uploaded to a server?
No. Everything runs locally in your browser using FFmpeg compiled to WebAssembly. Your file never leaves your device.
Why does my screen recorder save WebM instead of MP4?
Browser-based recorders use the MediaRecorder API, which defaults to WebM. This converter turns that WebM into a universally compatible MP4 in seconds.
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Sponsored by the makers
Tired of boring screen recordings?
Try Screen Charm.
Auto-zoom, motion blur, camera overlay, and background music. All built in. Record once, export a polished video.
See what it does