WebM to MP4 converter
Convert WebM (open web video format) into MP4, which plays on every browser, phone, and device. Everything happens locally in your browser — no uploads, no servers, and no waiting in a queue.
WebM to MP4 — common questions
Is the WebM to MP4 converter free?
Yes — it's completely free, with no sign-up, no watermark, and no limit on how many files you convert.
Are my WebM files uploaded to a server?
No. The conversion runs entirely in your browser, so your WebM file never leaves your device and is never uploaded.
How do I convert WebM to MP4?
Drop your WebM file into the tool above, then click the convert button. The MP4 file is generated locally and ready to download in moments.
Will I lose quality converting WebM to MP4?
Quality is preserved as closely as the MP4 format allows. For most web video the result is visually identical to the source.
Does this work on mobile?
Yes — it runs in any modern browser on desktop or mobile, with nothing to install.