### FAST SECURE FREE

This tool uses high-performance WebAssembly technology to process MPEG-4 Video data into high-quality Matroska Video files.

Privacy: 100% PRIVATE. No data ever leaves your browser. All processing happens locally on your device.

### SECURE CONVERSION

- PRIVATE MODE  
- ALWAYS ON  
- COMPRESSION  
- LOSSLESS READY  
- CLOUD STORAGE  
- NEVER STORED

### HOW IT WORKS

Q: How to convert MP4 to MKV?  
A: Simply drag and drop your MP4 file into our converter, select the output settings, and download your MKV file instantly.

Q: Is this converter free?  
A: Yes, Drift Labs is 100% free and open source. There are no subscriptions or hidden fees.

Q: Is it safe to convert files here?  
A: Completely. Unlike other converters, your files are processed locally in your browser. Nothing is ever uploaded to a server.