How to convert MP4 to WebM
- Select your MP4 file (or drag & drop it) — the file never leaves your device.
- Adjust the conversion options if you need to — the defaults work great for most files.
- Click the convert button and let your browser process the file locally.
- Download your new WebM file. Done — in four quick steps.
Why convert MP4 to WebM?
There are plenty of good reasons to convert MP4 to WebM — here are the ones that matter most:
Video conversion runs entirely on your device, so large files may take a while and need some memory — we'll warn you before starting.
Because all processing happens on your device, converted files are ready to download in seconds — even on slower connections.
MP4 vs WebM: what changes?
Here's how MP4 and WebM differ at a glance — this is exactly what the conversion changes for your file:
| Property | MP4 | WebM |
|---|---|---|
| Compression | Lossy | Lossy |
| Transparency | — | — |
| Animation | No | No |
| Vector graphics | — | — |
| Compatibility | Excellent | Good |
Format information
About MP4
- Compression
- Lossy
- Transparency
- —
- Compatibility
- Excellent
About WebM
- Compression
- Lossy
- Transparency
- —
- Compatibility
- Good
Frequently asked questions
Is the MP4 to WebM converter really free?
Yes. Every tool on converteren.com is free, with no sign-up, no watermarks and no hidden limits on the number of files you can convert.
Is my file uploaded to a server?
No. The conversion runs entirely in your browser using modern web technology. Your MP4 file never leaves your device — you could even disconnect from the internet after loading the page.
Will the quality be affected?
That depends on the formats involved. Video conversion runs entirely on your device, so large files may take a while and need some memory — we'll warn you before starting.
How large can my file be?
You can convert files up to 500.0 MB in this tool. Because processing happens locally, the practical limit also depends on your device's memory — modern laptops and phones handle large files comfortably.
Do I need to install anything?
No. Converteren.com works in any modern browser — Chrome, Firefox, Safari or Edge — on desktop and mobile. There's nothing to download or install.