Convert MP4 videos to MKV format for multiple audio tracks and subtitles.
Convert MKV to MP4
Convert MKV videos to MP4 format. Better compatibility with devices and platforms.
Select your files
or drag and drop your file here
* Files deleted after 24 hoursConvert files up to 100 MB for free
How to convert MKV to MP4 online
1
Drag and drop your MKV file, or click to select a file. Works with MKV files from various sources.
2
The tool converts your MKV to MP4. It checks codecs and converts if needed. If codecs are compatible, it uses direct stream copy to keep quality.
3
Wait for the conversion to finish. Large files may take several minutes. A progress bar shows the status.
4
When conversion finishes, you can preview the MP4 file. Check the video quality, audio tracks, and subtitles before downloading.
5
Click Download to save the MP4 file to your device. Files are deleted after 24 hours.
About MKV Format
MKV (Matroska Video) is an open-source container format that can hold video, audio, subtitles, and metadata in one file. It's flexible and supports many codecs, making it popular for high-quality video storage and archiving. However, MKV has limited native support on many devices and platforms.
History and Development
MKV was developed by the Matroska project starting in 2002. It was designed as an open alternative to proprietary formats, with support for multiple audio tracks, subtitles, and chapters. The format became popular among video enthusiasts and content creators because of its flexibility and support for various codecs. However, many consumer devices and platforms don't have built-in MKV support, which is why conversion to MP4 is often needed.
Technical Specifications
MKV is a container format, meaning it can hold different types of media. It supports multiple video codecs (H.264, H.265, VP9, AV1), multiple audio tracks, multiple subtitle streams, chapters, and attachments like fonts. The format is open-source and extensible, allowing for advanced features. However, this flexibility means that not all MKV files are compatible with all players, especially on mobile devices and smart TVs.
Advantages
- Supports multiple audio tracks
- Supports multiple subtitle streams
- Supports chapters
- Open-source format
- Flexible codec support
- Good for archiving
- Supports attachments
Limitations
- Limited device support
- Not supported on many Apple devices
- Limited browser support
- May require extra apps
- Not ideal for sharing
- Some codecs may not be compatible
Device Compatibility
MKV has limited native support on many devices. While it works well on desktop media players like VLC, many mobile devices, smart TVs, game consoles, and browsers don't support MKV natively. Converting to MP4 improves compatibility across devices and platforms, making videos easier to share and play without extra software.
Use Cases for MKV to MP4 Conversion
Converting MKV to MP4 is useful for anyone who wants better device compatibility. Common uses:
Device Compatibility
Convert MKV files to MP4 for better support on Apple devices, game consoles, smart TVs, and other devices that don't support MKV natively.
Web Sharing
Convert MKV to MP4 to share videos on websites or social media. MP4 has better browser support and works on more platforms.
Mobile Viewing
Convert MKV files to MP4 for mobile devices. Many mobile devices don't support MKV, so conversion makes videos playable on phones and tablets.
Media Server Compatibility
Convert MKV to MP4 for better compatibility with media servers like Plex or Emby. MP4 files are more widely supported and stream better.
Video Editing
Convert MKV to MP4 for video editing software. Many editing programs work better with MP4 files, especially on Mac and Windows.
Streaming
Convert MKV to MP4 for streaming platforms. MP4 is the standard format for most streaming services and video platforms.
Archiving and Backup
Convert MKV to MP4 for long-term storage. MP4 files are more compatible and will work on more devices in the future.
Technical Details
Video and Audio Codecs
MKV is a container format that can hold various codecs. Common video codecs in MKV include H.264, H.265, VP9, and AV1. Audio codecs include AAC, MP3, FLAC, and DTS. When converting to MP4, compatible codecs (like H.264 and AAC) can be copied directly without re-encoding, preserving quality. Incompatible codecs (like VP9) need to be re-encoded, which may affect quality and file size.
Format Limitations
MKV has limited native support on many devices, especially mobile devices and smart TVs. While MKV is flexible and supports advanced features, this flexibility can cause compatibility issues. Some MKV files may not play on certain devices even with codec support, because the container format itself isn't recognized. Converting to MP4 solves these compatibility issues while maintaining video and audio quality when possible.
MKV vs MP4
Here's how MKV compares to MP4:
Feature
MKV to MP4
MP4
Device Support
Limited (requires extra apps)
Wide support (native on most devices)
Codec Support
Very flexible (many codecs)
Limited (H.264, H.265, AAC)
Multiple Audio Tracks
Yes (full support)
Yes (limited support)
Subtitles
Multiple streams supported
Limited support
Best For
Archiving, high-quality storage
Sharing, device compatibility, web
MKV to MP4 conversion FAQ
Why convert MKV files to MP4 format?
MKV is flexible and good for archiving, but MP4 has better support on devices and platforms. Many Apple devices, game consoles, browsers, and smart TVs have limited MKV support. Converting to MP4 lets you play videos without extra apps, and makes it easier to share, upload to social networks, or embed on websites.
Can I maintain multiple audio tracks and subtitles from my MKV files?
Yes. When possible, the converter keeps multiple audio tracks with language tags and selectable subtitle streams. You can also burn subtitles into the video. For formats that are not MP4-compatible, they are converted to compatible alternatives while keeping as much functionality as possible.
What about video and audio quality when converting from MKV to MP4?
If your MKV codecs are MP4-compatible, the converter uses direct stream copy (no re-encode) so quality stays the same and conversion is fast. If re-encoding is needed (for unsupported codecs like VP9 or some profiles), it uses high-quality settings to keep detail while balancing file size and compatibility.
How are MKV’s advanced features handled?
For features like chapters, multiple subtitles, and attachments (like fonts), the converter embeds them in a way that works with MP4. Complex subtitle styling can be converted to supported formats or burned in. Where MP4 has no direct equivalent, it provides alternatives to keep the viewing experience consistent.
What’s the best approach for converting a large media library?
Use batch conversion to queue many files and apply consistent settings across your library. You can maintain folder structures and naming conventions. For media servers like Plex or Emby, metadata is preserved when possible.
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