How to compress a PNG
- Drop your PNG into the box above.
- Pick the color count — 256 colors is usually invisible to the eye; try 64 for maximum savings.
- Download the optimized file.
Why are PNG files so large?
A standard PNG stores up to 16 million colors per pixel. Most logos, icons, and screenshots actually use only a handful of shades. This tool analyzes your image, builds the smallest optimal palette, and re-encodes the file — the same core technique popular desktop optimizers use, running privately inside your browser.
Frequently Asked Questions
Will 256 colors look worse?
For flat graphics, UI screenshots, and clipart — virtually never. With dithering enabled, even gradients survive surprisingly well. Photographs may benefit more from JPG compression.
Is transparency kept?
Yes, transparent areas remain fully transparent.
Are my images uploaded?
No. All processing happens locally in your browser using JavaScript.
Is it free?
Completely free, unlimited, no sign-up, no watermarks.
More free image tools
Browse all tools on our tools page: JPG compressor, compress to exact KB, WebP converter, background remover, and the vintage photo effect.