How to losslessly shrink a PNG's file size

1. Upload the PNG

   Drop a `.png` file into the "Image" field. The image's pixels, transparency, and dimensions are preserved — only the encoding bytes get tighter. Output is still a fully valid PNG playable in every browser/viewer.

2. Press Run

   Result returns `bytesIn`, `bytesOut`, `savedPercent`, and the optimised file. Savings vary wildly: large photo-like PNGs barely shrink (you should be using JPG/WebP), but icons and screenshots can drop 30–60%.

3. When PNG is the wrong format

   PNG is lossless and best for sharp-edged graphics, screenshots, and icons. If your image is a photograph, switch to WebP (smaller AND mostly indistinguishable) or JPG. Compressing a photo as PNG is fighting the format.

4. If savings disappoint

   PNGs from pngcrush/pngquant/oxipng already squeeze hard. If `savedPercent` is < 5%, your source is already near optimal. For deeper savings consider quantising to palette PNG (loses subtle colour gradients) or converting to WebP.