Video Compressor

Our Video Compressor uses WebAssembly to compress videos directly in your browser. No uploads to any server — your files stay completely private on your device.

The tool uses the H.264 (libx264) codec with configurable CRF (Constant Rate Factor) to balance file size and visual quality. Lower CRF values preserve more quality but result in larger files.

Quality Presets

• Low (480p): Maximum compression, CRF 35. Best for sharing via messaging apps.
• Medium (720p): Balanced quality, CRF 28. Good for web and social media.
• High (1080p): Minimal compression, CRF 23. Best for archiving.
• Custom: Set your own CRF between 18 and 51.

How to Compress a Video

1. Click the upload area and select your video file.
2. Choose a quality preset or set a custom CRF value.
3. Click "Load Engine" to initialize the compressor.
4. Click "Compress Video" and wait for processing to complete.
5. Preview the result and download your compressed video.

Frequently Asked Questions

Are my videos uploaded to a server?

No. All processing happens entirely in your browser using WebAssembly. Your video files never leave your device.

What video formats are supported?

MP4, MOV, WebM, and AVI are supported. The output is always MP4 for maximum compatibility.

Why does it take time to compress?

Video compression is computationally intensive. The speed depends on your device's CPU performance and the video length.