Compress MKV video
Make MKV files smaller so they fit email attachments, upload forms and messaging apps. Choose how strong the compression should be, upload the file and download the result — it never comes back bigger than the original.
Drag & drop your MKV file here, or
Compress MKV video: how it works in 3 steps
- 1
Pick a level
Balanced suits most files; light keeps the most quality, strong gives the smallest file.
- 2
Upload your MKV
Drag and drop the MKV file or choose it from your device.
- 3
Download the smaller file
You see how much smaller it got, then download it with one click.
Compression levels
- Light
- High quality (H.264, CRF 23) at the original resolution.
- Balanced
- Up to 1080p with very good quality — a good fit for sharing and uploading.
- Strong
- Up to 720p for the smallest file, ideal for WhatsApp or email.
Why compress a MKV video?
- Messaging apps and email limit the size of videos you can send.
- Smaller videos upload faster and use less mobile data.
- They take far less space on your phone and in cloud storage.
Tips for compressing MKV video files
- Longer and higher-resolution videos take longer to process.
- If only the sound matters, converting to MP3 gives a much smaller file.
- Keep the original if you plan to edit the video later.
What is MKV?
MKV (Matroska) is an open, royalty-free container that can hold any number of video, audio and subtitle tracks plus chapters in a single file. It is popular for films and archives, but many phones, TVs and editors do not open it natively.
Frequently asked questions
- Is it free to compress MKV video files?
- Yes. Free accounts can process files up to 50MB, 10 times every 24 hours; Pro raises that to 1.5GB with no daily limit.
- Will the quality drop?
- It depends on the level: light is visually almost identical, strong trades some quality for the smallest file.
- How much smaller will my file get?
- It depends on the content: files with large photos or high-resolution video shrink the most. If a file cannot be made smaller, you get the original back unchanged — never a bigger file.
- Is my file safe?
- Files travel over an encrypted connection, are scanned for malware (files up to 200 MB) and are deleted automatically: after 1 hour without an account, 24 hours with a free account, or 7 days with Pro.
- Can I compress files on my phone?
- Yes. It works in any modern browser on Android, iPhone, tablets and computers.
- Does the compressed file get a watermark?
- No. The MKV you download has no watermark, logo or added page.
- Which compression level should I choose?
- Start with balanced. If the file is still too big, try strong; if you notice quality loss, use light.