How It Works
Understand our compression techniques and get the most out of Compresso.
Simple 3-Step Process
Upload Your File
Drag and drop or click to browse. We support PDFs, images (JPG, PNG, WebP, GIF), and videos (MP4, MOV, WebM).
Choose Settings
Select compression level, quality, or use platform presets. Preview changes in real-time for images.
Download Result
Get your compressed file instantly. See exactly how much space you saved with our detailed results.
Compression Techniques
PDF Compression
We use pdf-lib to analyze and optimize PDF files:
- Analyzes PDF structure and identifies optimization opportunities
- Reduces embedded image quality where visual loss is minimal
- Removes duplicate embedded resources
- Optimizes font embedding and content streams
Image Compression
We use browser-image-compression and compressorjs for high-quality results:
- Reads and processes images entirely in your browser
- Smart compression based on your quality setting
- Canvas API for real-time before/after preview
- Optional format conversion (JPG, PNG, WebP)
Video Compression
Video files are compressed using FFmpeg:
- Upload your video file securely
- Select resolution (1080p, 720p, 480p, 360p)
- Platform presets for Email, WhatsApp, Instagram
- Real-time progress tracking
Compression Levels
Balanced Mode
Reduces file size by ~40% with minimal quality loss. Recommended for most use cases.
Maximum Mode
Reduces file size by ~70% with some quality tradeoffs. Best for large files or strict size limits.
Power User Tips
Keyboard Shortcuts
Press ? anytime to see all shortcuts.
Compression History
All compressions saved locally. Export as CSV anytime.
Share Settings
Generate shareable URLs with your compression settings.
Batch Processing
Mix file types and download all as ZIP archive.
Need to encode or decode files before you compress them? CodeCipher bundles essential conversion utilities for developers.