Convert WebM to MP4
Drop a WebM file below and press Convert. Wemute re-encodes the VP8/VP9 video to H.264 and the audio to AAC inside your browser, producing an MP4 that iPhone, Premiere, Final Cut and social sites accept.
- No upload
- No sign-up
- Many files download as one ZIP
Convert to MP4
How it works
Three steps
Drop WebM recordings.
Press Convert.
Download the MP4.
Good for
- Edit browser screen recordings
- Play WebM on iPhone
- Upload recordings to social platforms
Questions
About WebM to MP4
Why don't some apps open WebM?
WebM uses Google's VP8/VP9 codecs, which Apple devices and many editors don't support natively. MP4 with H.264 is the universal alternative.
Why is video slower than a desktop app?
Browser video encoding runs on the CPU without hardware acceleration. Wemute avoids re-encoding whenever the video stream can simply be moved into the new container, which makes most MOV and MKV to MP4 jobs finish in seconds.
Are my files uploaded?
No. Wemute converts files inside your browser tab with your device's own processor. The file contents and names never reach our servers, and nothing is kept after you close the page.
Format comparison
How WebM and MP4 differ
| WebM | MP4 | |
|---|---|---|
| Compression | Lossy (VP8, VP9 or AV1) | Lossy (usually H.264) |
| Best for | Video on web pages, screen recordings | Sharing and uploading video anywhere |
| Compatibility | Browsers; limited on iPhone and editors | Universal |
WebM: Common from browser screen recorders, but many apps won't import it. MP4: H.264 in MP4 plays on virtually every phone, browser, TV and editor.
Related tools
Wemute for Mac
Word, Excel, PDF, e-books and 100 more conversions, OCR, background removal and subtitles — all on your Mac. Free and open source.
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