What the converted MKV contains
The output is a Matroska container with H.264 video, AAC audio, and the yuv420p pixel format. The uploaded media is decoded and re-encoded into that combination.
Convert video to MKV
Upload a video and convert it to MKV.
MKV
Your converted file will appear here.
Video to MKV converter
MKV output is helpful when you want a Matroska video file for players or tools that prefer that container.
- Convert MP4, MOV, WebM, AVI, MPEG, and other videos to MKV.
- Create Matroska video files for players and tools that prefer the MKV container.
- Keep upload, conversion, preview, and download in one browser page.
When to choose MKV
MKV is useful for desktop playback, media libraries, and applications that prefer the open Matroska container. MP4 remains the safer choice when browser, phone, or presentation compatibility is the priority.
Tracks and subtitles
Although the MKV container can support multiple audio tracks and subtitles, this conversion produces the main encoded video and audio output. Do not rely on it to preserve extra tracks, chapters, attachments, or subtitle streams.
Quality expectations
Changing to MKV does not improve the source resolution or restore missing detail. Re-encoding can alter both quality and file size compared with the uploaded video.
Frequently asked questions
Does the MKV preserve subtitles and extra audio tracks?
The conversion is intended for the main video and audio output. Extra subtitle, chapter, attachment, and alternate-audio streams should not be expected to carry over.
Which codecs does the MKV use?
The output uses H.264 video, AAC audio, and the yuv420p pixel format inside a Matroska container.
Can I convert video to MKV online?
Yes. Upload a video file, choose MKV as the output format, and download the converted file when processing finishes.
Which video files are supported?
Common video uploads such as MP4, MOV, WebM, AVI, MKV, and MPEG are supported.
What happens to my uploaded file?
The converter processes the upload on the server. Temporary input and output files are deleted after the conversion request finishes.