Convert MP4 to MKV Free Online
Transform your MP4 videos into MKV format with advanced multi-track and subtitle support. Private, instant, and free.
Drag & drop MP4 files here
or click to browse · up to 10 files at once
About This Conversion
MP4 (MPEG-4 Part 14) is the standard video container used across devices and streaming platforms worldwide. MKV (Matroska Video) is an open, flexible container format that can hold an unlimited number of video, audio, subtitle, and metadata tracks in a single file. An MP4 to MKV converter is essential for users who need the advanced capabilities that Matroska provides, such as embedding multiple subtitle languages, alternate audio tracks, or chapter markers. MKV is the preferred format for archiving high-quality video because it supports virtually every codec ever created, including H.264, H.265, VP9, and AV1. The format is widely supported by popular media players like VLC, MPC-HC, and Kodi. Our free MP4 to MKV converter operates entirely within your browser, keeping your video files private and secure throughout the conversion process.
Why Use This Converter?
- Multiple subtitle tracks — MKV can embed numerous subtitle files in different languages directly within the video file, eliminating the need for separate subtitle files.
- Multiple audio tracks — Store commentary, different language dubs, or alternate audio mixes all within a single MKV file for a complete viewing experience.
- Chapter support — MKV natively supports chapter markers, allowing viewers to easily navigate to specific sections of longer videos or presentations.
- Open format — Matroska is an open standard with no licensing fees, ensuring your video files remain accessible and playable well into the future.
- Codec flexibility — MKV supports virtually every video and audio codec in existence, giving you maximum flexibility in how your content is encoded and stored.
How to Convert
Converting MP4 to MKV takes just three simple steps:
- Upload your MP4 files — Drag and drop your MP4 videos into the converter above, or click to browse your files. You can convert up to 10 files at once.
- Adjust settings — Review the output options for your conversion. Your files are processed entirely in your browser for maximum privacy.
- Download your MKV files — Click download on individual files or grab all converted videos as a single ZIP file.