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WebM to MP4 Converter

Convert WebM files to MP4 without installing software or uploading anything. The video is re-encoded to H.264, so long files take a while.

  • Free, no sign-up
  • Files never leave your device
  • Powered by FFmpeg
  • No watermark
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Your files are processed on this device and are never uploaded to a server.

What happens when you convert WebM to MP4

Inside a typical WebMVP8, VP9 or AV1 video with Opus or Vorbis audio
Copy without re-encodingRarely: the codecs are not compatible, so the video is re-encoded
When re-encodedH.264 video with AAC audio
Opens inevery phone, browser, TV, editor and social network

Sizes are typical values; your files will vary with content and settings.

WebM

WebM WebM Video

WebM is an open, royalty-free container built for the web, usually holding VP8 or VP9 video with Opus or Vorbis audio. Browser screen recorders and many web apps save WebM by default.

WebM converter
MP4

MP4 MPEG-4 Part 14

MP4 is the universal video container. With H.264 video and AAC audio it plays on every phone, browser, smart TV and social network, which makes it the safest choice for sharing.

MP4 converter

How to use the WebM to MP4 Converter

  1. 1

    Choose a WebM file or drop it onto the page.

  2. 2

    Review the video options. The defaults suit most files.

  3. 3

    Click Convert and download your MP4 when processing finishes.

Fixing screen recordings that will not play

Browser-based screen recorders and many web apps save WebM with VP8 or VP9 video, which iPhones, PowerPoint and some editors refuse to open. Converting to MP4 re-encodes the video as H.264 so it plays everywhere. Lower the resolution to 720p for a much faster conversion of long recordings.

Why convert WebM to MP4?

WebM files come from videos saved from websites and from browser-based screen recorders. iPhones, some TVs and many editors play it poorly or not at all. Choose MP4 to upload to social media, send in a chat app or play on any phone and TV.

Frequently asked questions

Will the MP4 lose quality?

Both formats are lossy, so converting re-encodes the data once more. Using a high quality setting keeps the generational loss very small. Avoid converting the same file back and forth repeatedly.

Does converting WebM to MP4 re-encode the video?

Rarely: the codecs are not compatible, so the video is re-encoded. A typical WebM contains VP8, VP9 or AV1 video with Opus or Vorbis audio. Otherwise the result is H.264 with AAC audio.

Questions about privacy, file-size limits or conversion speed are answered in the general FAQ.