Convert MP4 to MKV - Video Converter
Free online tool to convert MP4 to MKV video format. Fast, private, browser-based conversion.
Drop video files here or click to browse
Supports MP4, WebM, AVI, MOV, MKV, FLV, 3GP, MPEG, M4V, TS
Supported Formats
Most compatible video format
Open web video format
Classic Windows video format
Apple QuickTime format
Flexible Matroska container
Flash video format
Mobile video format
Classic digital video format
Apple video container
Transport stream format
Features
Privacy First
All conversions happen in your browser. Videos never leave your device.
Multiple Formats
Support for all major video formats.
Batch Conversion
Convert multiple videos at once.
No Size Limit
Convert videos of any size (limited by browser memory).
Why Convert MP4 to MKV?
Converting MP4 to MKV helps ensure your video plays correctly across different devices, platforms, and media players.
MPEG-4 Part 14 (MP4)
Container
The most widely supported video format across all devices and platforms.
Matroska Video (MKV)
Container
Flexible open format supporting multiple audio/subtitle tracks.
How to Convert MP4 to MKV
- Click the upload area or drag and drop your video file.
- Select the output format from the dropdown.
- Optionally adjust the resolution setting.
- Click "Convert All" to start processing.
- Download your converted video file.
MP4 vs MKV — Format Comparison
| Format | Type | Quality | File Size | Compatibility | Best For |
|---|---|---|---|---|---|
| MP4 | Container | High (H.264/H.265) | Small to Medium | Universal | General use, streaming, mobile |
| MKV | Container | High (any codec) | Medium | Moderate (desktop players) | Media collections, multiple tracks |
Frequently Asked Questions
Is converting MP4 to MKV free?
Yes, our MP4 to MKV converter is completely free. All processing happens in your browser.
Will I lose video quality converting MP4 to MKV?
There may be minimal quality loss during re-encoding. Using higher quality settings helps preserve the original quality.
How long does MP4 to MKV conversion take?
Conversion time depends on file size, duration, and your device's processing power. Most short videos convert in under a minute.
Is my video file safe during MP4 to MKV conversion?
Absolutely. All processing happens locally in your browser. Your video files are never uploaded to any server.
Can I batch convert multiple MP4 files to MKV?
Yes, you can upload and convert multiple MP4 files to MKV format simultaneously.