Free Video Converter
Convert between MP4, WebM, MKV and MOV instantly in your browser. No uploads, no accounts, 100% private.
Loading converter...
Supported conversions
Convert between all major video container formats.
How it works
Select Your Video
Drag and drop or browse to choose any MP4, WebM, MKV, or MOV file from your device.
Choose Output Format
Pick your target format. The converter automatically detects the input and shows available options.
Download Instantly
Conversion happens right in your browser. Download the result immediately — no email, no account required.
Why convert in your browser?
No servers, no uploads, no waiting.
No Upload Required
Your files stay on your device. Zero bytes are sent to any server.
Lightning Fast
Remuxing, not re-encoding. Near-instant conversion for most files.
100% Private
No data leaves your browser. Processing is powered by WebCodecs.
Works Offline
Once loaded, the converter works without an internet connection.
Frequently asked questions
Want automatic conversion?
The Video Downloader Plus extension converts streams to MP4 automatically as you download them.