Convert MP4 to WebM
Drop a file here or choose one
Supports files up to 100 MiB each.
Drop in a file, click convert, and you're done. Everything runs directly in your browser with no upload to wait for, and the result is ready to download right away.
Things to know
- WebM encoding is computationally heavy, so it takes longer than other conversions.
- A media engine (about 32MB) is downloaded once on first use and cached afterwards.
- Subtitles, data tracks, and original metadata are not preserved.
How to use
Select a video
Choose an MP4 or MOV file up to 100 MiB.
Pick a quality
Choose the standard, high, or maximum quality setting.
Convert to WebM
Start the conversion and download the verified WebM file.
Frequently asked questions
What kind of WebM file is produced?
The output is a WebM with VP8 video and the first audio track encoded as Opus. Videos without an audio track can still be converted video-only.
Why does the conversion take so long?
The video is fully re-encoded inside your browser. Even for a video of the same length, it takes longer than an MP4 conversion, and it can take even longer depending on your device's performance.
What is the difference between the quality settings?
Standard, high, and maximum quality use progressively lower CRF values and higher bitrate caps, so quality improves and file size grows in that order.
Where can WebM files be played?
Most modern browsers, including Chrome, Firefox, and Edge, can play WebM. Some older devices and apps may not support it.
Is my video sent anywhere?
No. Your file never leaves your device. The conversion runs inside your browser and nothing is uploaded.