How to convert MP4 to WebM
- Click the box above or drag in your MP4 files.
- Keep "WebM" selected (or pick another format) and optionally a max resolution.
- Click "Convert" and download the WebM files.
Why convert MP4 to WebM?
MP4 is the most widely supported video format. With H.264 video and AAC audio it plays on every phone, computer, TV, browser and social network.
WebM is an open video format made for the web, typically with VP9 or AV1 video and Opus audio. Browsers play it well, but many phones, editors and upload forms expect MP4.
Good to know
- Processing speed depends on your device. A modern laptop usually converts video faster than real time. Changing only the container (for example MOV with H.264 to MP4) is almost instant because the video is copied, not re-encoded.
- Set "Max resolution" to 1080p or 720p to make the file smaller at the same time.
Frequently asked questions
Is it free to convert MP4 to WebM?
Yes. You can convert MP4 to WebM for free, 3 files at a time up to 250 MB each, with no sign-up and no watermark. Pro removes the file limit, handles files up to 2 GB and downloads everything as one ZIP.
Are my files uploaded to a server?
No. Vidverter runs entirely in your browser and uses your device's own video encoders. Files never leave your computer or phone, so it is safe for private recordings, and there is no upload or download wait.
Which browsers work?
Current versions of Chrome, Edge, Safari and Firefox on Windows, Mac, iPhone and Android. Chrome and Edge are the fastest because they use hardware video encoders on most computers.
Will I lose quality?
When only the container changes, no: the video is copied as is. When re-encoding is needed, Vidverter uses a high quality setting that is visually identical for normal viewing.