Compress Video – Reduce Video File Size Online Free
Compress MP4, AVI, MOV, and MKV videos directly in your browser using FFmpeg. Choose from quality presets and download your smaller video instantly.
Upload Video to Compress
Drag & drop or browse files
Supports MP4, AVI, MOV, MKV, WebM — up to 500MB
Max file size: 500 MB
How to Use
Upload Video
Click or drag to upload your video file (up to 500MB).
Choose Preset
Select a compression preset — High Quality, Balanced, or Smallest File.
Download
Wait for processing to complete and download your compressed MP4.
Why Use Our Tool?
3 Compression Presets
Choose between quality levels to get the right balance of size and quality.
100% Private
FFmpeg WASM runs in your browser — your video is never uploaded.
Wide Format Support
Accepts MP4, AVI, MOV, MKV, and WebM input formats.
Fast Start Output
Output MP4 is optimized for web streaming with fast-start enabled.
Frequently Asked Questions
What video formats are supported?
You can upload MP4, AVI, MOV, MKV, and WebM files. The output will always be an MP4 (H.264) file.
How much can I reduce my video size?
Compression results vary by content and preset. Choosing 'Smallest File' can reduce file size by 50–80% for most videos.
Is my video uploaded to a server?
No. Video compression runs entirely in your browser using FFmpeg WebAssembly. Your video never leaves your device.
Why does compression take a long time?
Video compression is computationally intensive. FFmpeg WASM runs in your browser, which is slower than native processing. Large files may take several minutes.