Image Compressor Online
Compress images by adjusting quality and dimensions. Side-by-side comparison with file size savings. Supports JPG, PNG, and WebP.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the Image Compressor work?
Your image is loaded onto an HTML Canvas and optionally downscaled to a maximum dimension while preserving aspect ratio. The canvas is then exported using toBlob() with the chosen output format (JPEG or WebP) and a quality parameter between 1-100 that controls lossy compression aggressiveness. The browser's native encoder handles the actual compression. A debounced live preview re-compresses on every settings change.
How much can I compress an image?
Typical compression reduces file size by 50-80% with minimal visible quality loss. Photos from cameras are often 3-10 MB and can be compressed to under 500 KB while still looking good on screen.
Will compression ruin my image quality?
At moderate quality settings (60-80%), compression is nearly invisible to the human eye. The side-by-side comparison lets you see exactly how the compressed version looks before downloading.