Reduce video file size while maintaining quality
Drag & drop video file here
Supports MP4, MKV, AVI, MOV, WebM and more
Drag & drop your MKV file
Select quality level and target size
Get your smaller MKV file instantly
Matroska Video
MKV is a flexible, open-standard container format that can hold an unlimited number of video, audio, subtitle, and metadata tracks. It's the preferred format for high-quality video archival and media collections.
Common reasons to reduce MKV file size
Compress MKV videos to fit email attachment limits and messaging apps.
Reduce MKV file sizes by up to 80% while maintaining visual quality.
Optimize MKV for faster upload to YouTube, Vimeo, and social platforms.
Create lightweight MKV files that stream smoothly on mobile networks.
Your videos never leave your device. All compression happens locally in your browser.
Hardware-accelerated compression powered by WebCodecs and WebAssembly.
Compress MP4, MOV, AVI, MKV, WebM and more video formats.