Convert WebM to MP4
Upload any WebM video and convert it to a ready MP4 file that works on every device and program — all processing happens inside your browser.
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🔒 All processing happens inside your browser — your files are never uploaded to any server. First use loads a processing library (~25 MB) which may take a minute depending on your connection speed.
Frequently Asked Questions
Does the quality change during conversion?
The conversion keeps quality very close to the original using standard H.264 encoding, compatible with every player.
Are my files uploaded to any server?
Not at all — the entire conversion happens inside your browser using WebAssembly technology, and your file never leaves your device.
Why is the first use slow?
The first time you use the tool, your browser loads a video-processing library (around 25 MB) — subsequent uses are faster since it's cached by your browser.