turnformatMP4
MP4 is the most compatible video format: it plays on any phone, computer, TV or website, and stays small thanks to the H.264 codec.
Convert MP4 to WEBM
Upload your files and download them converted in seconds.
Drop your files here
or
Choose filesUp to 50 MB per file and 20 files at once
How to convert MP4 to WEBM
This tool converts MP4 files to WEBM right in your browser. There's nothing to install and no account to create: upload the file, pick WEBM and download it.
Upload your MP4 file: drag it onto the upload area or click “Choose files”.
Check that the target format is WEBM and click “Convert”.
Download your WEBM file as soon as it's ready.
What changes when you convert MP4 to WEBM
- The video is recompressed for the WEBM: resolution and length are kept, but it may lose some quality.
| Feature | MP4 | WEBM |
|---|---|---|
| Moving picture | Yes | Yes |
| Sound | Yes | Yes |
About the formats
WEBM
WEBM is an open video format designed for the web. Browsers play it without plugins and it's small for its quality.
Frequently asked questions
Is it free to convert MP4 to WEBM?
Yes. Conversion is free, you don't need an account and the result has no watermark. You can upload files of up to 50 MB.
Do I lose quality converting MP4 to WEBM?
Length and, for video, resolution are kept. If the WEBM uses lossy compression, a high quality setting is used so the difference is barely noticeable.
Is it safe to upload my files?
Your files are only used for the conversion and are deleted automatically after 60 minutes. They're never shared with anyone.
Can I convert several MP4 files at once?
Yes. You can upload up to 20 files at once and convert them all with “Convert all”.
Does it work on mobile, Mac and Windows?
Yes. It works in any modern browser, on desktop and mobile, with nothing to install.