Why PNG Files Are So Large
PNG is a lossless format: it stores every pixel exactly, which makes it perfect for screenshots, logos, and graphics with sharp edges and text — and also makes it heavy. A full-color PNG stores up to 16.7 million possible colors at 3–4 bytes per pixel, even when the actual image uses only a few hundred distinct colors.
That gap is the opportunity. This PNG compressor analyzes your image, builds an optimized palette of the colors actually present, and repacks the file in indexed mode — the same "quantization" technique behind the most famous PNG optimizers. The visual difference is essentially imperceptible; the size difference is typically 50–80%.
What Compresses Best
- Screenshots & UI captures — flat colors and text quantize almost losslessly. Expect 60–80% savings.
- Logos, icons & illustrations — limited palettes by design; huge reductions with zero visible change.
- Graphics with transparency — alpha is preserved through 8-bit palette transparency.
- Photographs — PNGs of photos compress less dramatically; consider converting to JPG (often 90% smaller) if transparency isn't needed.
PNG vs JPG vs WebP — Quick Guide
Keep PNG for anything with text, sharp edges or transparency. Switch photos to JPG for the smallest universally compatible files. For the modern web, WebP beats both — around 30% smaller than equivalent PNGs with alpha support. Whatever you keep as PNG, compress it here first: it's free performance for your website and faster uploads everywhere else.