Convert MP4 to MKV Online
Free, easy-to-use MP4 to MKV converter. Transform your videos to the versatile MKV container format with no quality loss.
MP4 to MKV Converter
Convert your MP4 files to MKV format quickly and easily. Upload your file and download the result.
Max file size: 50MB
Why Convert MP4 to MKV?
MKV (Matroska Video) is a versatile container format that can store multiple video, audio, and subtitle tracks in a single file. Converting MP4 to MKV offers several advantages, particularly for those who need advanced multimedia capabilities or want to store content with multiple languages or subtitle options.
Benefits of Converting MP4 to MKV
- Multiple audio tracks - Store various language tracks or commentary in a single file.
- Multiple subtitle support - Include subtitles in different languages within the same file.
- Chapter markers - Add chapter information for easier navigation of long videos.
- Open standard - MKV is an open-source format with no licensing restrictions.
- Lossless conversion - Convert from MP4 to MKV without re-encoding or losing quality.
How to Convert MP4 to MKV Using Our Tool
- Upload your MP4 video file using the upload button or drag and drop functionality.
- Our converter will automatically select MKV as the output format.
- Solve the simple captcha to verify you're human.
- Click "Convert MP4 to MKV" to start the conversion process.
- Once conversion is complete, download your new MKV file.
About MP4 and MKV Format Differences
| Feature | MP4 | MKV |
|---|---|---|
| Multiple Audio Tracks | Limited support | Extensive support |
| Multiple Subtitles | Limited support | Extensive support |
| Codec Support | Limited range | Almost unlimited |
| Chapter Support | Basic | Advanced |
| Device Compatibility | Excellent | Good (requires player support) |
When you convert MP4 to MKV, you're essentially changing the container format while keeping the underlying video and audio content intact. This is typically a "remuxing" process rather than a full re-encoding, which means the conversion is fast and doesn't degrade the quality of your video or audio.
MKV containers can hold virtually any type of video or audio codec, making them incredibly versatile. This means your MP4 video's H.264 video stream and AAC audio stream can be moved to an MKV container without transcoding, preserving 100% of the original quality while gaining MKV's benefits like better subtitle support and chapter markers.
Other Video Conversion Options
Frequently Asked Questions
Is quality lost when converting MP4 to MKV?
No, converting from MP4 to MKV is typically a lossless process. Rather than re-encoding the video and audio streams (which would cause quality loss), our converter simply transfers the original streams into a new MKV container. This process, known as "remuxing," maintains 100% of the original quality while changing only the container format.
Will MKV files play on all my devices?
MKV files have excellent compatibility with most modern media players on computers, including VLC, Media Player Classic, and MPV. However, some mobile devices, smart TVs, and older media players may not support MKV natively. In these cases, you might need to use a compatible player app or convert the file back to a more widely supported format like MP4 for those specific devices.
Can I add subtitles when converting to MKV?
Our basic converter doesn't currently support adding external subtitle files during conversion. However, if your MP4 already contains subtitles, they will be preserved in the MKV file. If you need to add subtitles, you can use a media editing tool like HandBrake or MKVToolNix after converting your file to MKV, as the MKV format is ideal for storing multiple subtitle tracks.