Convert MP4 to MKV
Free, fast and secure — convert MP4 to MKV right in your browser.
Convert MP4 to MKV for wider compatibility
Converting MP4 to MKV gives you a more widely supported file that opens cleanly across more devices, apps and platforms — handy when MP4 will not play nicely everywhere.
How to convert MP4 to MKV
- 1 Drop your MP4 file into the converter above.
- 2 It is converted to MKV automatically — no settings to fiddle with.
- 3 Download your new MKV file instantly.
MP4 vs MKV
| Feature | MP4 | MKV |
|---|---|---|
| Compression | Lossy | Lossy |
| Transparency | No | No |
| Animation | Yes | Yes |
| MIME type | video/mp4 | video/x-matroska |
| Best for | Sharing, streaming and uploading video anywhere with maximum compatibility. | Archiving high-quality video with multiple tracks — converted to MP4 for everyday playback. |
About the formats
MP4 video
MP4 (H.264) is the universal video container. It balances quality and file size beautifully and plays on virtually every device, browser and platform.
Strengths
- Plays almost everywhere
- Great quality-to-size ratio
- Ideal for streaming and social media
Limitations
- Lossy compression
- Less flexible than MKV for multiple tracks
- Older codecs can look dated
Best for: Sharing, streaming and uploading video anywhere with maximum compatibility.
Matroska video
MKV (Matroska) is a flexible open container that can bundle many video, audio and subtitle tracks in one file. It is popular for high-quality archives and media libraries.
Strengths
- Holds multiple audio/subtitle tracks
- Open and future-proof
- Great for high-quality storage
Limitations
- Not supported on many phones/browsers
- Often needs converting to play
- Larger than streaming formats
Best for: Archiving high-quality video with multiple tracks — converted to MP4 for everyday playback.