MKV (Matroska Video) is an open-source container format that can hold multiple video, audio, and subtitle tracks in a single file. MKV files tend to be large because they often contain high-bitrate video, multiple audio tracks (like different languages), and embedded subtitles. This makes them excellent for archival but oversized for sharing.

Our compressor focuses on reducing the video bitrate, which is what makes MKV files large. However, since our output is optimized for web sharing, the result will contain the primary video and audio track. If you need to preserve multiple audio tracks or embedded subtitles, consider using desktop software like HandBrake for more granular control.

Typically 50-85% depending on the original encoding. MKV files ripped from Blu-ray or recorded at very high bitrates compress the most. A 2 GB MKV file often shrinks to 300-600 MB while maintaining good visual quality for normal viewing.

If you plan to share the video or play it on mobile devices, converting to compressed MP4 is usually the better option. MP4 is universally compatible with all devices and platforms, while MKV requires specific players like VLC. If you are keeping the file for personal use on a computer, compressing the MKV directly works fine.

Yes. Blu-ray MKV files are often 20-50 GB and use very high bitrates. These are ideal candidates for compression because there is substantial room to reduce bitrate without visible quality loss. Expect 70-90% size reduction for typical Blu-ray rips.

Yes. All files are transferred over encrypted HTTPS and automatically deleted after compression. We do not store or view your content.