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Convert MP4 to WebM Online — Free

Convert MP4 videos to WebM format for web optimization. Free, no upload, browser-based.

WebM is optimized for web playback and typically produces smaller files than MP4. Convert your MP4 to WebM for better web performance.

Drop your file here

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Supported: MP4, MOV, WebM, AVI, MKV

How to Convert MP4 to WebM

Drag and drop your MP4 file onto the converter.

Conversion runs locally in your browser using ffmpeg.wasm.

Download the optimized WebM file for use on websites.