WebM to MP4
Convert a WEBM video to MP4 format in your browser by re-recording it into a browser-supported container — free, fast and private.
How to use WebM to MP4
- Choose a WEBM video file.
- Click Process Video — it is re-recorded into the browser-supported container.
- Wait while it plays through.
- Download the converted video.
Honest limit: a browser cannot do a native codec conversion from WEBM to MP4. This tool plays your video and re-records it into the browser-supported WebM container, and downloads it as a .webm file — it plays everywhere modern browsers do, but it is NOT a native .mp4 file. Do not use it where a true mp4 codec file is required.
Frequently Asked Questions
Is the WebM to MP4 free?
Yes, it is 100% free with no sign-up. Your files and data stay in your browser.
Is this a real WEBM to MP4 conversion?
Not a native codec conversion — browsers cannot encode %s. The video is re-recorded to WebM, which plays in all modern browsers and players.
Is my file uploaded to a server?
No. This tool runs entirely in your browser — your file is never uploaded.
Will the quality stay the same?
The picture is re-recorded at full resolution, so quality stays very close to the original.