MP4 to WEBM Converter
Convert MP4 files to WEBM. Processed inside your browser — files never leave your device.
Drop your MP4 file here
or click to choose
Choose fileHow to use
- Drop or choose the MP4 file to convert.
- The output format is preset to WEBM.
- Hit 'Convert to WEBM' — it converts inside your browser and downloads right away.
Frequently asked questions
Are my files uploaded to a server?+
No. Conversion happens entirely inside your browser and your file is never sent anywhere — personal videos stay private.
Does WebM play in Safari?+
Recent Safari versions play WebM, but older iOS devices can be limited. If compatibility is the priority, stick with MP4.
Is there a file size limit?+
No server limits, but processing uses browser memory, so it's optimized for short clips (tens to a few hundred MB). Files over 300MB show a warning.
Is it really free?+
Yes. No sign-up, no payment, no conversion limits and no watermark.
Can I pick a different output format?+
Yes — on the converter you can switch the output between MP4, WebM, MOV, MKV, AVI and GIF.
Guide
Why convert MP4 to WEBM?
WEBM (WebM) is Google's open video format built for the web: smaller files at the same quality for page embeds, native support in every modern browser, and no licensing baggage.
It's the go-to when you want background or demo videos on a website to load light.
What happens to quality and size?
Your video is re-encoded with the VP8 codec, tuned to keep web-playback quality while trimming size.
Re-encoding takes time proportional to clip length — expect tens of seconds for short clips.