MP4 → MKV
MP4 to MKV
Convert MP4 video to MKV with control over quality, resolution, and frame rate. Free and unlimited.
Drag & drop files here, or click to choose
.mp4,.mov,.webm,.mkv,.avi,.m4v,.mpg,.wmv,.3gp · up to 3 files
Files are sent over encrypted HTTPS, processed on our servers, and permanently deleted within 2 hours.
Need a different format? Open the full Convert Video to pick any output.
About converting MP4 to MKV
MP4 is the most widely supported video format, playable on virtually every device and platform. MKV is a flexible container that can hold multiple audio, video, and subtitle tracks in one file. Converting from MP4 to MKV swaps one for the other without changing the underlying content.
Re-encoding video is lossy, so we use quality-preserving defaults — you can still tune the resolution, quality, and frame rate before you start.
How it works
- Choose your MP4 file
- Pick your options
- Download the MKV
Frequently asked questions
How do I convert MP4 to MKV?
Upload your MP4 file above, and it converts to MKV in seconds. It's free, needs no sign-up, and there are no watermarks.
Is the MP4 to MKV converter free?
Yes — completely free with no limits, no account, and no watermarks.
Will converting MP4 to MKV reduce quality?
We use high-quality conversion settings to preserve as much fidelity as possible. You can often adjust quality options before converting.
Is it safe to convert MP4 files here?
Yes. Files are deleted automatically within 2 hours and are never read or shared.