Video ToolsFree

WebM to MP4

Convert WebM video files to MP4 format for playback on all devices and apps. WebM is optimized for HTML5 web video but lacks support on iPhone, Apple TV, and many media players. MP4 with H.264 plays everywhere without additional software. No signup.

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MP4, MOV, AVI, MKV, WebM, FLV, WMV, VOB

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Frequently Asked Questions

What is WebM format?▼
WebM is an open-source video format developed by Google for HTML5 web video. It uses VP8, VP9, or AV1 video codecs and Vorbis or Opus audio. It is optimized for web streaming.
Why doesn't WebM play everywhere?▼
WebM is not supported natively on iPhone, iPad, Apple TV, or older Samsung/LG Smart TVs. Many media players and video editors also lack WebM support.
Does converting WebM to MP4 reduce quality?▼
The conversion re-encodes VP9/AV1 to H.264. At the default quality settings (CRF 23), visual quality is preserved. The output file may be slightly larger than the WebM.
Is the conversion done in the browser?▼
Yes. FFmpeg WebAssembly converts WebM to MP4 locally. No video is uploaded.
Are WebM files from screen recordings supported?▼
Yes. WebM files from browser screen recording, Discord, Loom, and other web tools all convert correctly.