Choose your WebM file
Select WebM from your device. The file is processed locally.
ON YOUR DEVICE
WebM to MP4
Convert WebM videos to MP4 on your device. Choose settings and download the result.
Drop your file here
One file · Device-dependent capacity · Best for short clips
Files stay on your device
Three simple steps
Prepare MP4 output
MP4 output uses H.264 video and AAC audio for broad player support.
Save and check your MP4 file
The video is re-encoded. Extra audio tracks, subtitles, chapters, HDR metadata and DRM protection are not preserved or bypassed.
Common questions
What changes when I convert WebM to MP4?
WebM output uses VP8 video and Vorbis audio. Player and editing support differs from MP4. MP4 output uses H.264 video and AAC audio for broad player support. The video is re-encoded. Extra audio tracks, subtitles, chapters, HDR metadata and DRM protection are not preserved or bypassed.
Will the MP4 file be smaller?
Not necessarily. MP4 output uses H.264 video and AAC audio for broad player support. Size depends on the source and settings. The result reports file sizes and processing time.
Which WebM files work here?
The container must contain decodable media. Encrypted or DRM-protected streams are unsupported. Test a short sample if your recording uses an unusual codec.
Is there a size cap for WebM to MP4?
There is no fixed file-size quota. Process one main file at a time. Your device memory and browser determine practical capacity. Large selections show a warning that you can continue past.