MP4 to MKV Converter

convert MP4 files to MKV format locally in your browser.

Upload MP4

Drag and drop or click to upload

How to convert MP4 to MKV

Covertfily provides a seamless, privacy-first way to convert your MP4 files to MKV. Unlike traditional online converters, our technology performs the conversion directly in your web browser. This means your data is never sent to our servers, keeping your sensitive information 100% private.

Why Choose Local Conversion?

1. Privacy

No one else ever sees your files.

2. Speed

No wait times for uploading or downloading large files.

3. Security

Eliminate risk of data breaches on cloud servers.

Frequently Asked Questions

Is it free?

Yes, Covertfily is free and open-source.

What is the maximum file size?

Since it runs on your device, it depends on your browser's memory, but most files up to 100MB work perfectly.