WebM to MP4 Converter
WebM video to MP4 format.
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Click or drag and drop a .webm file here
Ctrl+Enter
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Frequently Asked Questions
What is a WebM file? +
WebM is an open video format developed by Google, commonly used for web video. It typically uses VP8 or VP9 video codecs with Vorbis or Opus audio. Many browsers support it natively, but most mobile devices and media players prefer MP4.
Does converting WebM to MP4 reduce quality? +
The video is re-encoded using H.264 and AAC codecs, so there is minor quality loss from transcoding. For most purposes the difference is imperceptible. The output uses faststart for optimized streaming.
Where do WebM files typically come from? +
WebM files are common from screen recordings, browser-based video capture, and some video download tools. Websites like Reddit and some social platforms also serve video in WebM format.
How long does the conversion take? +
It depends on file size and your device speed. A 100MB file typically takes 30-90 seconds. The WASM engine runs on your CPU, so faster processors finish sooner.
Why does the engine take a while to load? +
The video engine (FFmpeg compiled to WebAssembly) is about 24MB. It downloads once when you first click Convert, then stays cached by your browser for future visits.
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