Convert MP4 to WebM
Upload any MP4 video and convert it to a smaller WebM file that's ideal for websites — 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
Why convert video to WebM?
WebM is smaller than MP4 at close to the same quality, making it ideal for faster-loading video on websites.
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 converting to WebM a bit slower?
WebM (VP8) video encoding takes more processing than MP4, so it may take a bit longer depending on the video length and your device.