Convert MP4 to MKV Online Free
Convert MP4 to MKV instantly in your browser. No uploads needed - your files stay private on your device.
drag & drop files here
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images, videos, audio, documents - all processed locally
Why convert MP4 to MKV?
- ✓MKV may offer better compatibility with your target platform
- ✓Optimize video for web streaming or social media
- ✓Reduce file size while maintaining acceptable quality
- ✓Prepare video for specific devices or players
How to convert MP4 to MKV
Upload your file
Drag and drop your MP4 file onto the converter, or click to browse your files.
Select MKV as output
Choose MKV from the format dropdown. The converter will automatically detect your file type.
Convert instantly
Your file is processed entirely in your browser using WebAssembly. No upload needed.
Download your file
Click the download button to save your converted MKV file.
About MP4 format
MP4 is the most widely used video container format, supporting H.264/H.265 video codecs and AAC audio. It offers excellent compression while maintaining high quality, making it the standard for streaming, downloads, and video sharing. Nearly every device, platform, and media player supports MP4 playback.
Pros
- +Universal device and platform support
- +Excellent compression with H.264/H.265
- +Supports subtitles and multiple audio tracks
Cons
- -Lossy compression affects quality
- -Editing can be complex without re-encoding
- -Some advanced codecs may not play everywhere
About MKV format
MKV (Matroska) is a flexible, open-standard container format that can hold virtually unlimited video, audio, and subtitle tracks. Popular for high-definition video distribution, MKV supports modern codecs and features like chapters and metadata. It's the format of choice for video enthusiasts.
Pros
- +Supports virtually any codec
- +Multiple audio and subtitle tracks
- +Chapter and metadata support
Cons
- -Limited device playback support
- -Not suitable for streaming
- -May require codec packs on some systems