Convert MP4 to MKV
Free, instant, and secure online converter. Upload your .mp4 file and receive a crisp .mkv result in seconds.
Need the opposite conversion? Convert MKV to MP4 →
How to convert MP4 to MKV
Upload Your File
Click the upload zone or drag and drop your .mp4 file anywhere on the area.
Start Converting
Hit Convert and our server will process your file instantly with high fidelity preservation.
Download Result
Your .mkv file is ready in seconds! Click download. Files auto-delete in 6 hours.
MP4 vs MKV: Comparison
| Attribute | MP4 (.MP4) | MKV (.MKV) |
|---|---|---|
| Category | video | video |
| MIME Type | video/mp4 | video/x-matroska |
| Description | MP4 is the most universally supported video container, ideal for streaming and sharing across all devices. | MKV (Matroska) is an open-source container that can hold virtually unlimited video, audio, and subtitle tracks... |
About These Formats
About MP4 files
MP4 is the most universally supported video container, ideal for streaming and sharing across all devices.
About MKV files
MKV (Matroska) is an open-source container that can hold virtually unlimited video, audio, and subtitle tracks.
Frequently Asked Questions
How do I convert MP4 to MKV?
Upload your .mp4 file using the box above, or drag and drop it in. We'll automatically convert it to .mkv format — just click download when it's ready.
Is it free to convert MP4 to MKV?
Yes. Converting MP4 to MKV is completely free, with no watermarks, no signup, and no limit on how many files you convert.
Is it safe to convert files here?
Yes. Files are processed securely and automatically deleted from our servers a few hours after conversion. We never share or view the contents of your files.
What is a mp4 file?
MP4 is the most universally supported video container, ideal for streaming and sharing across all devices.
What is a mkv file?
MKV (Matroska) is an open-source container that can hold virtually unlimited video, audio, and subtitle tracks.