Is WebM to MP4 free? Is there a watermark?

Yes — WebM to MP4 is completely free, with no sign-up, no watermark, and no limit on how many files you process.

Do my files get uploaded to a server?

No. WebM to MP4 runs entirely in your browser with WebAssembly, so your WebM file never leaves your device and nothing is stored or seen by us.

What can I put in, and what do I get out?

WebM to MP4 accepts WebM and gives you back a MP4 file.

Will I lose quality converting to MP4?

No noticeable loss for most files — WebM to MP4 uses high-quality settings (a two-pass colour palette for GIFs, H.264 at a visually-lossless quality for video), so the result stays crisp.

Free tools · Convert

WebM to MP4

Convert a WebM video into a standard H.264 MP4 that works in every editor, messenger, and social platform. Everything runs locally in your browser — nothing is uploaded.

Runs entirely in your browser. Your file is never uploaded — no watermark, no account.

Drop a file or click to chooseWebM

How to use WebM to MP4

1
Choose your file. Drop a file into the tool, or click to select one. It stays on your device — nothing is uploaded.
2
Pick your settings. Adjust the options if you like, then press Run. The first run downloads a ~32 MB engine once; after that it's instant.
3
Download. Everything is processed right in your browser — download the finished file instantly, with no watermark.

Frequently asked questions

Is WebM to MP4 free? Is there a watermark?: Yes — WebM to MP4 is completely free, with no sign-up, no watermark, and no limit on how many files you process.
Do my files get uploaded to a server?: No. WebM to MP4 runs entirely in your browser with WebAssembly, so your WebM file never leaves your device and nothing is stored or seen by us.
What can I put in, and what do I get out?: WebM to MP4 accepts WebM and gives you back a MP4 file.
Will I lose quality converting to MP4?: No noticeable loss for most files — WebM to MP4 uses high-quality settings (a two-pass colour palette for GIFs, H.264 at a visually-lossless quality for video), so the result stays crisp.