WebM to MP4

Convert WebM videos to MP4 format online for free. MP4 plays on every device and platform. No account needed.

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File is too large. The limit is 100 MB.

Supported: .webm (Max 100 MB)

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info About this tool
Convert WebM videos to MP4 format for universal playback. WebM is an open-source format used by browsers (Chrome, Firefox) for web video — but it's often not playable on iPhones, older Android devices, Windows Media Player, or most smart TVs. MP4 (H.264) is the most universally supported video format. Converting your WebM to MP4 ensures it plays everywhere without any special codec installation.

File size: MP4 output size is typically similar to the WebM source, depending on codec efficiency.

Quality: Video re-encoded to H.264. Some quality loss from transcoding is expected but minimal at high bitrates.

format_list_numbered How to convert
  • 1
    Upload your WebM video — up to 100 MB.
  • 2
    Our converter re-encodes the video to H.264 MP4 with AAC audio.
  • 3
    Download your MP4 — plays on any device or platform.
help FAQ

Will there be quality loss?

A small amount. WebM uses VP8/VP9 codec and MP4 uses H.264 — transcoding between codecs always involves some re-encoding. At high quality settings, the difference is minimal.

Why doesn't WebM play on my iPhone?

iOS does not support VP8/VP9 video codecs natively. Converting to MP4 (H.264) is the solution for iPhone and iPad playback.

Does it preserve the audio?

Yes. Audio is re-encoded from WebM's Opus/Vorbis track to AAC, which is standard for MP4 containers.
lightbulb Common use cases
  • check_circle Playing a WebM video downloaded from a browser on an iPhone or smart TV
  • check_circle Uploading a WebM recording to a platform that requires MP4
  • check_circle Converting browser screen recordings to a universally playable format
  • check_circle Sharing a WebM clip with someone who can't play it
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