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MP4 to WebM Converter

Convert MP4 video to WebM (VP9) format for smaller file sizes and open-format compatibility. Processing happens entirely in your browser.

Drop MP4 video or click to selectOutput: WEBM, OGG, MP4

How to mP4 to WebM Converter

  1. Drop or select an MP4 video file.
  2. WebM (VP9) output is pre-selected.
  3. Click Convert and wait for encoding to finish.
  4. Download the WebM file.

Private by design — all processing happens in your browser. Your images are never uploaded to a server.

Related tools

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Frequently asked questions

Why convert MP4 to WebM?

WebM (VP9) typically produces smaller files than H.264 MP4 at the same visual quality. It is also a fully open, royalty-free format supported by all modern browsers.

Is WebM compatible with all browsers?

WebM VP9 is supported by Chrome, Firefox, Edge, and most modern browsers. Safari added support in macOS Big Sur. For maximum compatibility, MP4 is safer.

Are my files kept private?

Yes. All conversion runs locally in your browser using WebAssembly. Nothing is uploaded to any server.