MP4 to WebM Converter Online — VP8 and Vorbis
Convert MP4 to VP8 WebM locally in your browser for modern web playback.
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About this tool
This tool converts MP4 video into a WebM container using VP8 video and optional Vorbis audio, suitable for modern browsers and web publishing workflows.
How to use
- Choose a supported video smaller than 200 MB.
- Select the output option, then start local processing.
- Preview and download the new video before closing the page.
Features
- MP4 and M4V input.
- VP8 video with optional Vorbis audio.
- Browser-local processing.
Common use cases
- Create WebM media for an HTML video element.
- Prepare an alternative web video format.
- Convert an MP4 recording for a WebM workflow.
Common issues and tips
- Software video encoding is CPU intensive and may be slow.
- Older applications may support MP4 more consistently than WebM.
Privacy
The video is processed locally in your browser with FFmpeg WebAssembly and is not uploaded to Tools12345.
Frequently asked questions
Which codecs are used?
VP8 video and Vorbis audio.
Will WebM always be smaller?
Not necessarily; size depends on source content and encoding settings.
Can Safari play the result?
Current support varies by browser version and device, so test the downloaded file.