Convert WebM to MP4 — free, in your browser, no watermark

No upload, ever. The conversion runs entirely inside your browser on your own device — your video is never sent to any server and nothing is stored or shared. Because the file never leaves your device, it is safe even for private or sensitive footage.

Converting WebM to MP4 is a full video transcode (re-encoding VP8/VP9 and Opus into H.264 and AAC), which needs a real video engine. The first time you use the tool it downloads that engine once — around 30 MB — and then caches it, so later conversions start immediately. It is still 100% in your browser; nothing is uploaded.

Short clips finish in a few seconds. Because the encode happens on your own device, larger or longer videos take longer — a minute-long clip may take a minute or two depending on your computer or phone. It runs in your browser tab while you wait, and nothing is ever uploaded.

WebM is a web-focused video format that many players, editors, phones, TVs and social apps still don't accept, so a downloaded .webm often refuses to open or upload. Converting it to MP4 (H.264/AAC) makes it play and import almost everywhere. Just drop your .webm file into this tool and download an MP4; it all runs in your browser, so nothing is uploaded.

Open the free EZ PDF Editor WebM to MP4 tool in your browser, drop in your .webm video, and download it as MP4. There is no paywall, no watermark, no email gate and no install — the transcode happens right on your device.

The MP4 is encoded at high visual quality (H.264, CRF 23), so it stays sharp for sharing, editing and uploading. Any transcode re-encodes the video, so it isn't pixel-for-pixel identical to the source, but the difference is hard to notice in normal use, and your original WebM is never modified.

Yes. Open the page in your phone browser and pick the .webm file. The transcode runs on the phone itself and the finished MP4 saves back to your device. Large videos use more memory, so very long clips convert best on a computer.

There is no upload, so there is no server limit — but because the whole video is processed in your browser's memory, very large files (roughly over a couple of GB) can run out of memory on some devices. For big videos, use a desktop browser for the smoothest result.

Yes. Select multiple .webm videos and they convert one after another, then download together in a single ZIP. Free no-account use handles a batch at a time; create a free account to convert more in one go.

Yes, it is 100% free with no watermark, no sign-up and no email. Your MP4 comes out clean with nothing stamped on it, and there is no daily cap or credit card, so you can convert as many WebM videos to MP4 as you need.

No. The WebM to MP4 converter runs in your browser on Windows, Mac, iPhone or Android — no app, no codec pack, no extension. Open the page, drop in your .webm video, and download a standard MP4.