Choose a WebM
Select a WebM video stored on your computer.
Convert WebM to MP4
Convert a WebM video to MP4 locally. Compatible streams are repackaged quickly; incompatible video or audio is converted to H.264 and AAC.
How to Convert WebM to MP4
Repackage or convert
The browser tries a quality-preserving fast path before encoding for compatibility.
Download the MP4
Save the finished MP4 directly to your device.
Frequently asked questions
Are subtitles included?
The first version converts the primary video and optional audio track. Embedded subtitles are not included.
Which audio track is used?
The first usable audio track is included in the MP4.
Will quality change?
Compatible streams keep their original quality. Incompatible streams are re-encoded for MP4 playback.
Is the WebM uploaded?
No. Conversion runs entirely in your desktop browser.