How to convert MP4 to WEBM
To convert MP4 to WEBM, upload your MP4 file, choose WEBM as the output format and press Convert. The finished WEBM file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns MP4 videos into WEBM files in your browser, with no software to install and no watermark. When the video and audio inside your MP4 file can be placed in WEBM as they are, the streams are copied without re-encoding, which is faster and keeps the original quality. Otherwise the video is re-encoded as VP9 video with Opus audio.
Why convert MP4 to WEBM?
- Designed for the web and royalty-free
- Plays natively in Chrome, Firefox, Edge and Android
- Efficient VP9 compression
- Plays on: Chrome, Firefox, Edge, Opera, Android and VLC; partial on Safari and iOS
What to expect from this conversion
- Expect a file of similar size to the MP4 original.
- WebM uses VP9, which compresses very well but takes longer to encode than H.264, so large videos need patience.
- The first audio track is kept. Subtitle tracks, extra audio tracks and chapters are not included in the converted file.
MP4 vs WEBM
| Property | MP4 | WEBM |
|---|---|---|
| Full name | MPEG-4 Part 14 | WebM |
| Released | 2001, ISO/IEC (MPEG) | 2010, Google |
| Generation | Modern | Modern |
| Typical file size | Small | Small |
| Plays on | Windows, macOS, Android, iOS, smart TVs, game consoles and every major browser | Chrome, Firefox, Edge, Opera, Android and VLC; partial on Safari and iOS |
| Best for | uploading to YouTube, Instagram, TikTok and WhatsApp; sharing a video that has to play everywhere | embedding video on your own website; short looping clips and web animations |
Steps to convert MP4 to WEBM
- Drop your MP4 video file onto the converter, or click to choose it.
- Check that WEBM is selected as the target and adjust the options if you want.
- Press Convert, then download your new WEBM file when it finishes.
Tips for the best result
- Leave Fast mode on to keep the original quality whenever the streams can be copied.
- Pick a lower resolution if the file is for a phone or messaging app.
- Use Mute if you only need the picture.
Frequently asked questions
How do I convert MP4 to WEBM?
Upload your MP4 file, make sure WEBM is the selected target and press Convert. When the progress bar finishes, download the WEBM file. No account or software is needed.
Is the MP4 to WEBM converter free?
Yes. It is free, with no watermark, no sign-up and no daily limit on how many files you convert. The site is supported by ads.
Will I lose quality when converting MP4 to WEBM?
Not necessarily. If the video and audio streams already fit inside WEBM, they are copied without re-encoding, so quality stays identical. If the file has to be re-encoded, the High setting keeps almost all visible detail, while Small trades some detail for a smaller file.
Will the WEBM file be a similar size to my MP4?
Expect a file of similar size to the MP4 original. Choosing a lower quality or resolution reduces the size further.
Which devices can play WEBM files?
WEBM files play on Chrome, Firefox, Edge, Opera, Android and VLC; partial on Safari and iOS.
How large a file can I upload?
You can upload videos up to 500 MB. Files are deleted from the server about 30 minutes after conversion.