Convert MP4 to WEBM online in seconds — free, with no sign-up. WEBM is lossy and ideal for efficient web video in Chrome, Firefox and Edge. Your files are encrypted and deleted automatically after 24 hours.
MP4
MPEG-4 (H.264) — The universal video container — plays on virtually every device, browser and platform.
WEBM
WebM — A royalty-free web video format (VP8/VP9) that's smaller than H.264 at equal quality.
How to convert MP4 to WEBM
- 1Upload your MP4 file
Click “Choose a file” or drag and drop your MP4 file onto the page — no sign-up or email needed.
- 2Convert to WEBM
WEBM is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your WEBM file
Your WEBM file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
MP4 vs WEBM
| MP4 | WEBM | |
|---|---|---|
| Full name | MPEG-4 (H.264) | WebM |
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Best for | sharing and publishing video anywhere | efficient web video in Chrome, Firefox and Edge |
Frequently asked questions
Does converting MP4 to WEBM lose quality?
Both MP4 and WEBM use compression, so re-encoding discards a little more data. For a single conversion the change is virtually invisible; just avoid repeatedly re-converting the same file.
What's the difference between MP4 and WEBM?
MPEG-4 (H.264) (MP4) is lossy and best for sharing and publishing video anywhere. WebM (WEBM) is lossy and best for efficient web video in Chrome, Firefox and Edge. Convert MP4 to WEBM when you need a video for efficient web video in Chrome.
Is the MP4 to WEBM converter free?
Yes — converting MP4 to WEBM is completely free. There's no watermark, no sign-up and no email required, and you can convert as many files as you like.
Are my MP4 files private and secure?
Yes. Your uploads are encrypted in transit, processed privately, and automatically deleted within 24 hours. We never share, sell or look at your files.
Can I convert MP4 to WEBM on iPhone, Android, Mac or Windows?
Yes. The converter runs entirely in your browser, so it works on any device — iPhone, iPad, Android, Mac, Windows or Linux — with nothing to download or install.
How long does it take to convert MP4 to WEBM?
Most files convert in a few seconds. Larger files take a little longer, and your upload speed is usually the limiting factor. There's no queue and no waiting for an email.
What else can I convert MP4 files to?
Besides WEBM, you can convert MP4 to AAC, AVI, FLAC, FLV, GIF, JPG and more — see the full list of MP4 conversions below.
Other conversions
Last updated July 2026