Free browser tool
WebM to MP4
Turn a WebM recording into an MP4 for a gallery, presentation or website. The conversion runs on your device; hosting the result is optional.
No sign-up to edit or download · Optional one-click hosting
WebM to MP4
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How to use webm to mp4
- Select your WebM file, such as a browser recording or downloaded web clip.
- Choose an output width and convert. Keep the tab open while the browser loads the video engine and processes the file.
- Preview the MP4, checking movement and sound. Download it, or upload the generated MP4 using Host on FooPixel.
Why convert WebM to MP4?
WebM is useful for browser recordings and web delivery. MP4 is often required by an editor, presentation app or publishing workflow. This tool re-encodes the video into an MP4; it does not simply rename the source.
Check transparency before converting
Some WebM files carry an alpha channel. The MP4 output from this tool is not a transparent-video format. If transparent areas are important to your design, retain the WebM and test an appropriate playback workflow instead.
Troubleshoot a WebM recording
If conversion fails, first make sure the source plays and the recording finished saving. A truncated recording may be missing essential data. Try a shorter recording when memory is limited. After conversion, use the MP4 compressor if you need a specific interval or tighter quality controls.
References
Common questions
Will the MP4 be smaller than the WebM?
Not necessarily. The codecs, source quality, dimensions and scene content affect the result. Check the measured output size.
Will a WebM with no sound gain an audio track?
No sound is invented. A silent source remains silent; supported source audio is retained when available.
Does this work offline?
The video engine must first be downloaded. Treat this as an online tool with local processing, rather than a guaranteed offline application.
Is it free and private to use?
You can process and download files for free without an account. The browser may download processing software, but your source media stays on your device. Only choosing Host on FooPixel uploads the generated output, which becomes publicly accessible after validation.