Compress PNG online.
Up to 80% smaller.

Three steps. Under 10 seconds.

Why is PNG so large — and how do you fix it?

PNG uses lossless compression, meaning every pixel is preserved exactly. A 4000 × 3000 px photo saved as PNG can easily be 8–15 MB versus 1–3 MB as JPEG at equivalent quality.

The standard way to compress a PNG without converting it is colour quantisation — reducing unique colours from 16.7 million (24-bit) down to 256 (8-bit indexed). For logos, icons, screenshots, and flat-colour graphics, this reduction is nearly invisible to the human eye.

• Compress the PNG when your image has transparency, is a logo, icon, illustration, or screenshot, or when you specifically need PNG format.
• Convert to JPEG when the image is a photograph with no transparency — JPEG achieves far smaller files than PNG compression for photos.
• Convert to WebP when the image is for a website — WebP outperforms both PNG and JPEG while supporting transparency.

How the compressor works.

This tool runs pngquant as a WebAssembly module directly in your browser — the same open-source algorithm used by TinyPNG, Squoosh, and professional image optimisation pipelines.

It uses a modified median-cut algorithm to find the optimal 256-colour palette for each image, minimising visible quality loss. The entire process is local — no PNG data is ever sent to any server.

• Website performance. Large PNGs slow page load times and hurt Core Web Vitals scores. Compressing reduces bytes the browser must download.
• App and game development. Sprite sheets, UI assets, and texture atlases must be as small as possible to minimise bundle size and load times.
• Email logos and signatures. Large embedded PNGs can cause emails to load slowly. A compressed PNG logo under 100 KB loads instantly.
• Docs and presentations. Screenshots saved as PNG are often oversized. Compressing before embedding reduces the document file size significantly.

Frequently asked questions

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