Compress PNG

PNG is a lossless format: it reproduces every pixel exactly, which makes it ideal for screenshots, logos, diagrams and any graphic with sharp edges or text. The price of that precision is size — a PNG screenshot can easily be five to ten times larger than it needs to be, because it stores far more distinct colors than the image visually contains. Every screenshot you take inherits this overhead, which is why folders of UI captures and documentation images grow so quickly.

This tool shrinks PNGs through palette quantization: it analyzes the image, builds an optimized palette of the colors that actually matter, and maps every pixel to it with careful dithering. The resulting size depends on the source. Palette reduction can change colors, gradients, soft shadows and anti-aliased edges, so compare the exported image with the original. Photographic PNGs shrink too, though photos are fundamentally better served by JPG or WebP.

If the file is destined for a website, consider switching the output to WebP under Options. WebP supports the same kind of transparency as PNG at a fraction of the size, and every modern browser renders it natively. Keep PNG when you need maximum compatibility — email attachments, office documents and older software.

As with every tool on this site, compression happens locally in your browser. Screenshots often contain names, messages and account details, so it matters that nothing is uploaded: the file is processed on your device, and your original stays untouched. Batch processing works too — drop a folder’s worth of files and download each result as it finishes.