MP4 to MKV Converter

Convert MP4 to MKV online, free and secure.

How to Convert MP4 to MKV (Step-by-Step)

  1. 1

    Select or Drag your File

    Click the "Choose Files" button to browse your folders, or simply drag and drop your MP4 file directly onto this page.

  2. 2

    Choose MKV as Output

    Verify that your target format is set to MKV.

  3. 3

    Local Conversion

    Click "Convert." Your file is processed entirely in your browser's memory—no data is uploaded to our servers.

  4. 4

    Instant Save

    Once finished, your MKV file will be ready for immediate save.

Pro-Tip: You can drag multiple files at once if you are doing a batch conversion!

MP4

MP4 is the world's most popular digital multimedia container format. It is used to store video, audio, and subtitles, offering universal compatibility across almost all devices and platforms.

MKV

MKV is an open-standard, free container format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is highly valued for its versatility.