How to convert WebM to MP4
Converting WebM to MP4 takes three quick steps:
- Add one or more WebM files — drag and drop them or click to browse.
- Click Convert to MP4 and let the conversion run in your browser.
- Download your new MP4 files individually or as a batch.
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.
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.
WebM vs MP4: how they compare
Both formats have their place. This table summarises the practical differences so you can pick the right one for the job.
| WebM | MP4 | |
|---|---|---|
| Format type | Video | Video |
| Compression | Lossy (VP8/VP9) | Lossy (H.264/H.265) |
| Quality | Lossy | Lossy |
| Best for | HTML5 web video | Sharing video anywhere |
Why convert WebM to MP4?
Converting WebM to MP4 gives you a file that is better suited to sharing video anywhere and web and social media, and that opens it up to far more apps, devices and websites.
What MP4 gives you: plays on virtually every device, good quality-to-size ratio and universal browser support.
Where WebM falls short: limited support on older devices, not ideal for editing software and less universal than MP4 offline. 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 WebM files as you like and download them together.
- Everything runs locally in your browser, so even large files convert quickly and nothing is uploaded.
WebM to MP4 — frequently asked questions
- How do I convert WebM to MP4?
- Add your WebM file, click Convert to MP4, and download the MP4 result. The whole process happens in your browser and takes just a few seconds.
- Is it free to convert WebM to MP4?
- Yes. This WebM to MP4 converter is completely free with no sign-up, no watermarks and no limit on the number of files you can convert.
- Are my WebM 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 WebM to MP4?
- MP4 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 WebM if you need an exact copy.
- Can I convert multiple WebM files at once?
- Yes. Add as many WebM files as you like and convert them in a single batch, then download each MP4 result.