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Compress MKV

Reduce MKV file size up to 80% with H.264 encoding — free, no signup.

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Maximum file size: 50 MB

Your file is processed securely and deleted automatically after conversion. Your data is protected under GDPR.

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Download Compressed MKV
1 Select MKV
2 Compress MKV
3 Download Compressed MKV

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How to 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.

Quick fact about 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.

Why compress MKV?

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.

Technical details

Input format MKV (Matroska)
Output format MKV (H.264 + AAC)
Typical reduction 50-70%
Resolution Preserved or downsampled
Encoder libx264
Audio AAC at 128 kbps
Max file size 500 MB per file
File retention Auto-deleted after compression

How the conversion works

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.

When to compress MKV

Quality considerations

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.

Limitations and caveats

Compatibility

Tips for best results

Compression levels explained

Level Size reduction Best for
Light (1080p, 4 Mbps) ~40-50% Quality-preserving
Medium (720p, 2 Mbps) ~60-70% Web, sharing
High (720p, 1 Mbps) ~70-80% Mobile playback
Maximum (480p, 0.5 Mbps) ~80-85% Severe limits

Common problems and fixes

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.

Frequently asked questions

Is MKV compression free? +
Yes — completely free, no signup, no watermark.
How much smaller will my MKV be? +
Typically 50-70% smaller at Medium.
Will I notice the quality loss? +
At Medium, no on phones and laptops.
Are subtitles preserved? +
No — embedded subtitles aren't preserved.
Is my file safe? +
Yes — files are auto-deleted after compression.
Can I compress multiple MKV files at once? +
Currently one file at a time.
What's the maximum file size? +
500 MB per MKV file.

Sources and references

Last reviewed: 2026-10-01