Convert MP4 to WEBM Online
MP4 and WebM serve different purposes. Convert MP4 to WebM here when you need HTML5 video, web streaming, YouTube uploads.
How to convert MP4 to WEBM
- Upload your MP4 file. Drag it onto the box above or click to browse. Files up to 200 MB are accepted.
- Choose WEBM as the output. The target format is pre-selected on this page — just press “Convert now”.
- Download the result. Conversion runs on our own server and the download starts as soon as it is ready. Your files are deleted automatically.
Why convert MP4 to WEBM?
MP4 is the universal video container, playable on virtually every device, browser, phone and smart TV. WebM is a royalty-free container designed for the web, usually carrying VP8/VP9/AV1 video with Opus audio. That difference is exactly why converting between them is so common: WebM is the better choice for HTML5 video, web streaming, YouTube uploads.
MP4 vs WEBM: key differences
| MP4 | WebM | |
|---|---|---|
| File type | lossy container | open container |
| Typical use | streaming, social media, mobile playback, archiving everyday video | HTML5 video, web streaming, YouTube uploads |
| Compatibility | Near-universal support. Typically pairs H.264/H.265 video with AAC audio. | Native in Chrome, Firefox and Edge; Safari support is limited on older versions. |
Tips for a clean MP4 to WEBM conversion
- Near-universal support. Typically pairs H.264/H.265 video with AAC audio.
- Use the highest-quality source MP4 you have — converting a compressed file again cannot restore lost detail.
- If you only need a smaller file, try a lower resolution or bitrate instead of a different format.
- Keep the original MP4 until you have checked the converted WEBM opens the way you expect.
Frequently asked questions
How do I convert MP4 to WEBM?
Upload your MP4 file to the converter on this page, make sure WEBM is selected as the output format and click “Convert now”. When the conversion finishes the download starts automatically.
Is this MP4 to WEBM converter free?
Yes — it is completely free and needs no account. Files up to 200 MB are accepted, and heavy use is rate-limited so the service stays available for everyone.
Will converting MP4 to WEBM reduce quality?
Because both formats preserve the original data, converting back and forth does not degrade quality.
What is a MP4 file?
MP4 is the universal video container, playable on virtually every device, browser, phone and smart TV. Its technical name is MPEG-4 Part 14 and it is typically used for streaming, social media, mobile playback, archiving everyday video.
What is a WEBM file?
WebM is a royalty-free container designed for the web, usually carrying VP8/VP9/AV1 video with Opus audio. Its technical name is WebM and it is typically used for HTML5 video, web streaming, YouTube uploads.
Can I convert MP4 to WEBM on my phone?
Yes. The converter runs in the browser on Android, iOS, Windows, macOS and Linux — no app installation is required.
Are my files kept on the server?
No. Uploaded files and converted results are deleted automatically a short time after the conversion finishes.