How to convert MP4 to WebM
Converting MP4 to WebM takes three quick steps:
- Add one or more MP4 files — drag and drop them or click to browse.
- Click Convert to WebM and let the conversion run in your browser.
- Download your new WebM files individually or as a batch.
What is MP4?
MP4 is the most widely compatible video format in the world. Using efficient H.264 compression, it balances small file sizes with good quality and plays on virtually every device, browser and platform — making it the safe default for sharing video.
What is WebM?
WebM is a free, open video format built for the web using the VP8/VP9 codecs. It produces small files at high quality and is supported natively by modern browsers, making it ideal for HTML5 video and royalty-free distribution.
MP4 vs WebM: how they compare
Both formats have their place. This table summarises the practical differences so you can pick the right one for the job.
| MP4 | WebM | |
|---|---|---|
| Format type | Video | Video |
| Compression | Lossy (H.264/H.265) | Lossy (VP8/VP9) |
| Quality | Lossy | Lossy |
| Best for | Sharing video anywhere | HTML5 web video |
Why convert MP4 to WebM?
Converting MP4 to WebM gives you a file that is better suited to html5 web video and royalty-free streaming, and that opens it up to far more apps, devices and websites.
What WebM gives you: free and open, no royalties, small files at high quality and native browser support.
Where MP4 falls short: lossy compression, patent-encumbered codecs and less efficient than newer formats. Converting keeps your content while moving to a format that matches where the file is going.
Tips for the best results
- You can convert several files in one go — add as many MP4 files as you like and download them together.
- Everything runs locally in your browser, so even large files convert quickly and nothing is uploaded.
MP4 to WebM — frequently asked questions
- How do I convert MP4 to WebM?
- Add your MP4 file, click Convert to WebM, and download the WebM result. The whole process happens in your browser and takes just a few seconds.
- Is it free to convert MP4 to WebM?
- Yes. This MP4 to WebM converter is completely free with no sign-up, no watermarks and no limit on the number of files you can convert.
- Are my MP4 files uploaded to a server?
- No. Conversion runs entirely on your device using your browser, so your files never leave your computer or phone.
- Will I lose quality converting MP4 to WebM?
- WebM uses lossy compression, so a small amount of detail is discarded to keep the file size down. At normal quality settings the difference is hard to notice. Keep your original MP4 if you need an exact copy.
- Can I convert multiple MP4 files at once?
- Yes. Add as many MP4 files as you like and convert them in a single batch, then download each WebM result.