Compress MKV

1. Upload your MKV file (up to 500 MB).
2. Choose a compression level.
3. Click 'Compress MKV' — takes 30 seconds to 5 minutes.
4. Download the smaller MKV.

MKV is a container that holds any video codec — often H.264 at high bitrates. Re-encoding at screen-appropriate bitrates reduces size by 50-70% with no visible difference.

MKV (Matroska) files — especially Blu-ray rips, anime, and web downloads — are often saved at very high bitrates. Re-encoding to screen-appropriate bitrates reduces size by 50-70% with no visible difference on phones, laptops, or TVs.

The compressor decodes the MKV video and re-encodes it at a lower bitrate using H.264. Resolution is preserved (or downsampled). Audio is preserved at AAC 128 kbps. Output is a smaller MKV.

• Shrinking Blu-ray MKV rips for storage.
• Reducing MKV size for sharing.
• Fitting more videos on a phone or SD card.
• Optimizing anime MKV collections.
• Reducing cloud storage costs for MKV archives.
• Preparing MKV for email or messaging.
• Optimizing MKV for VLC playback.

At Medium (720p, 2 Mbps), most MKV videos look identical to the original on phones and laptops. Higher compression levels reduce resolution visibly on large screens.

• Multiple audio tracks are reduced to the first track.
• Subtitles and chapters are not preserved.
• Re-encoding takes time — large videos take minutes.
• Very high compression reduces resolution visibly.
• HDR metadata may be lost in re-encoding.

• Output MKV plays on VLC, most modern players.
• Works with mpv, PotPlayer, phones (some), streaming devices.
• Standard MKV — no special software needed.
• Not natively supported on all devices.
• Ideal for archival playback and anime collections.

• Medium (720p, 2 Mbps) is the sweet spot — 60-70% smaller.
• MKV is best for VLC and modern players.
• For universal playback, convert to MP4 after compression.
• Videos with a lot of motion compress less efficiently.
• Batch-compress up to 500 MB at once.

Only one audio track in the output

Multiple audio tracks are reduced to the first track. Extract other tracks separately if needed.

Subtitles are missing

Embedded subtitles aren't preserved. Extract them separately with MKVToolNix.

Compression is slow

Video re-encoding is CPU-intensive. Expect 30 seconds to 5 minutes.

• Matroska — MKV Format