Optimize a PNG losslessly
Same pixels, verified identical, in a smaller file: compression tightened with nothing traded away.
Runs in your browser. Your file never leaves your computer.
- PixelsBit-identical, provably
- Graphics saveOften 20 to 60 percent
- DecisionsNone; it is lossless
- CostA moment of local compute
PNG compression has depths most tools never plumb: filter choices and packing strategies that a patient optimizer explores and an export dialog does not. Optimizing here re-packs the file losslessly, the pixels stay bit-for-bit identical, verifiable by any comparison, while screenshots, logos and UI graphics commonly drop 20 to 60 percent. There is no quality decision because nothing is lost; the only cost is a moment of computation, spent in your browser.
Questions
How can it shrink without losing anything?
PNG allows many valid encodings of the same pixels; the optimizer searches for tighter ones that quick exports never try.
Do photos benefit as much as graphics?
Less; photographic noise resists lossless packing. Flat-colour work saves most. Photos wanting real savings should consider WebP.
Is transparency preserved?
Perfectly, along with every other pixel; lossless means lossless.
Related conversions
- PNG to JPGScreenshots and exports that ballooned as PNG drop to a fraction as quality-85 JPG. Transparency becomes white.
- PNG to WebPLossless WebP beats PNG at its own game by about a third; lossy WebP crushes photographic PNGs entirely.
- PNG to AVIFAVIF pushes past WebP for photographic content, at the cost of slower encoding and older-software support.
- PNG to ICOA proper favicon file: 16, 32, 48 and 256 pixel versions packed together, from one square-ish PNG.
- PNG to PDFGraphics embedded losslessly, photos as JPEG, page sized to the image or fitted to A4 or Letter.
Part of convert images in your browser. Every other conversion is on the conversions index.