Convert MP4 to WEBM — Free & Private
Convert MP4 to WEBM online for free. MP4 is the most universally compatible video format; WEBM is an open-source video format for the web. All processing happens locally in your browser — your files never leave your device.
How to convert MP4 to WEBM
- 1
Select your MP4 file
Click or drag your MP4 file onto the converter above.
- 2
Convert to WEBM
The output format is pre-set to WEBM. Click the convert button to process your file.
- 3
Save instantly
Your converted WEBM file is ready — save it to your device, no email required.
MP4 to WEBM — FAQ
Is the MP4 to WEBM converter really free?
Yes, completely free. No hidden fees, no watermarks, no file size limits. LocalConvert is open source and free forever.
Are my MP4 files safe?
Absolutely. Your files never leave your browser. All MP4 to WEBM conversion happens using WebAssembly running locally on your device — no uploads, ever.
How long does MP4 to WEBM conversion take?
Most conversions finish in seconds. Larger files may take a little longer depending on your device's speed and memory.
What's the difference between MP4 and WEBM?
MP4 is the most universally compatible video format. WEBM is an open-source video format for the web.