MKV to MP4 Converter
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Supports: MKV
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
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Need help?How to Convert MKV to MP4 Online
- Upload Your MKV File: Click "+ Add Files" to select MKV files from your computer, Google Drive, or Dropbox. Large files supported.
- Adjust Settings (Optional): Choose video quality in Advanced Options. Default preserves original quality with H.264 encoding.
- Convert and Download: Click "Convert" and download your MP4 file.
Why Convert MKV to MP4?
Play on Any Device
MKV is popular for high-quality video (movies, TV shows, anime) but many devices can't play it — smart TVs, game consoles (PlayStation, Xbox), Chromecast, Roku, and many phones lack native MKV support. MP4 plays on everything.
macOS Compatibility
macOS cannot preview MKV files with Quick Look, play them in QuickTime, use them in iMovie, or share via AirDrop. Converting to MP4 makes your videos work natively with every macOS application and sharing method.
Social Media and Streaming
YouTube, Instagram, TikTok, Twitter/X, Facebook, and Vimeo all accept MP4 but not MKV. Converting ensures smooth uploading and processing.
Subtitle Handling
MKV files often contain multiple embedded subtitle tracks. When converting to MP4, subtitles can be burned into the video (hardcoded) or carried as a separate track, depending on your settings.
MKV vs MP4
| MKV | MP4 | |
|---|---|---|
| Container type | Open-source (Matroska) | ISO standard (MPEG-4) |
| Video codecs | H.264, H.265, VP9, AV1, etc. | H.264, H.265, AV1 |
| Multiple audio tracks | Yes (common) | Limited support |
| Multiple subtitle tracks | Yes (common) | Limited support |
| Chapter markers | Yes | Limited |
| Device support | PC, VLC, some smart TVs | Universal (all devices) |
| macOS support | VLC only | Native (QuickTime, Finder) |
| Streaming | Poor | Excellent |
| Best for | Archival, media servers | Playback, sharing, streaming |
Frequently Asked Questions
Does converting MKV to MP4 lose quality?
If the MKV uses H.264 video and AAC audio (common), conversion can be nearly lossless — just repackaging from one container to another. If re-encoding is needed, quality at default settings is imperceptible from the original.
What about multiple audio tracks?
MKV files often contain multiple audio tracks (e.g., English + Japanese for anime). MP4 has limited multi-track support — typically the primary audio track is preserved.
What about subtitles?
Embedded subtitles can be burned into the video (always visible) or may be lost depending on the subtitle format. For subtitle preservation, consider keeping the MKV for archival.
Can I convert large MKV files (1GB+)?
Yes. XConvert handles large files. Upload time depends on your internet connection.
Is it free?
Yes. Completely free with no watermarks, no sign-up required, and no file count limits.
Does it work on mobile?
Yes. Works in any modern browser on all devices — no app installation required.