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compresspng.org guides & articles

11 in-depth guides on Compress PNG and related topics.

Compressing on Mac

Compressing on Mac Batch Compressing PNGs on a Mac With Automator Build a macOS Quick Action that batch resizes every PNG in a folder, keeping originals intact. 8 min read Compressing on Mac How to Compress a PNG on a Mac Preview has no quality slider for PNG. Here is what macOS can and cannot do. 6 min read

How PNG compression works

How PNG compression works How PNG Compression Works Inside every PNG file, a two stage engine filters your pixels then compresses the differences. 5 min read How PNG compression works Lossless vs Lossy PNG Compression Choose the right PNG mode and save 70 percent or more without breaking your image. 6 min read How PNG compression works PNG File Size vs Image Dimensions Understand the quadratic math of PNG dimensions and know exactly when to resize before you compress. 6 min read

Compressing on Windows

Compressing on Windows How to Compress a PNG in Paint Paint has no compression slider, but two honest levers can shrink any PNG. 5 min read Compressing on Windows How to Compress a PNG on Windows Open Photos, resize, save as JPEG. Windows has no PNG quality slider. 5 min read

Photoshop and GIMP

Photoshop and GIMP How to Compress a PNG in GIMP The compression slider is lossless. The real savings are in indexed mode. 7 min read Photoshop and GIMP How to Compress a PNG in Photoshop Three Photoshop export routes compared, with the one that shrinks PNGs most. 7 min read

Choosing a format

Choosing a format PNG, JPG or WebP: Which Should You Use? Stop guessing image formats: what your picture actually is decides the answer. 7 min read Choosing a format When You Should Not Compress a PNG Palette reduction is permanent. Keep the original or lose it forever. 4 min read