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WebM to MP4

Convert a WebM video to MP4 for phones, editors, and social apps. It’s free, with no watermark.

Files stay on your device

Drop files to convert

See their format, then choose an output.

MP4, MOV, MKV, WebM, MPEG-TS, and 3GP videos. You can also drag in a whole folder.

How to convert WebM to MP4 online

Open a WebM, such as a screen recording or a downloaded clip, and export an MP4 that iPhones, editors, and social apps open. The WebM to MP4 converter re-encodes the VP8, VP9, or AV1 video to H.264 and the audio to AAC in your browser, without uploading the file.

  1. Step 1

    Choose your WebM
    Pick a file or drop it into the converter above.

  2. Step 2

    Keep MP4
    MP4 is selected; choose another format if you need one.

  3. Step 3

    Download the MP4
    Save the H.264 MP4 when it is ready.

What to expect

Supported inputs
WebM videos, including browser screen recordings, and other readable video files.
What happens
Video is re-encoded to H.264 and Opus or Vorbis audio to AAC, the codecs MP4 players expect. H.264 video and AAC audio already in the file are copied.
Limits
Re-encoding takes longer than copying and depends on your device. Firefox can't encode AAC, so its MP4s carry Opus audio instead.

Your files stay on your device

Your computer does the work, so the file never has to be uploaded, and that’s also why it’s free: there’s no server time for us to pay for. You don’t need an account, and nothing you make gets a watermark.

“Thanks a ton, man. Your tool was perfect for what I needed.”
Mr. Cerulean, a supporter

Questions

WebM uses codecs that iPhones, QuickTime, and many editors don't support. The MP4 from this page uses H.264 video, which they all open.

No. The video is re-encoded to H.264 at a high quality, so the picture changes slightly and the file can be larger than the WebM.

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