Convert MP4 to MKV Video
Convert MPEG-4 Part 14 Video (MP4) video files into universally compatible Matroska Multimedia Container (MKV) format. Fast, private, and free with no file size limits or upload waiting times.
MP4 vs MKV: Format Comparison
| Feature | MP4 | MKV |
|---|---|---|
| Compression Algorithm | Lossy (Compact file size) | Lossy (Compact file size) |
| Alpha Transparency | Not Supported (White background) | Not Supported (White background) |
| Animation / Sequences | Supported | Supported |
| Browser Compatibility | 100% (Universal video support) | Requires conversion for browser playback |
| Ideal Application | Web video streaming, social media uploads (YouTube, Instagram, TikTok), universal playback | High-definition movie rips, multi-language subtitle tracks, lossless audio containers |
How to Convert MP4 to MKV (3 Easy Steps)
- Upload MP4: Select your MP4 file by dragging and dropping it into the conversion box, or click Browse to choose from your device.
- Select MKV Output: Configure your output parameters. The tool is pre-set to convert to MKV. Adjust quality or dimension preferences if required.
- Instant Download: Click Convert and download your finished MKV instantly. Everything processes locally in your browser memory.
Technical Specifications
About MP4
Full Name: MPEG-4 Part 14 Video
MIME Type: video/mp4
Developer / Standard: International Organization for Standardization
The most universally compatible video format in history, playing natively on all modern phones, TVs, and computers.
About MKV
Full Name: Matroska Multimedia Container
MIME Type: video/x-matroska
Developer / Standard: Matroska Project (Steve Lhomme)
Named after Russian Matryoshka nesting dolls due to its ability to hold limitless video, audio, and subtitle streams.
Frequently Asked Questions
How do I convert MP4 to MKV?
Upload your MP4 video, adjust frame size or quality if desired, and click Convert. The video is rendered directly in your browser using WebAssembly FFmpeg.
Is there a file size limit for MP4 conversions?
Because processing runs locally on your computer rather than remote cloud servers, you are not bound by typical 100MB server upload caps.
Can I play MKV on all devices?
Requires conversion for browser playback