TweakPNG is a low-level utility for examining and modifying PNG image files. As it works with detailed file internals, a familiarity with the PNG format is useful.
A 64-bit version is included (within the x64 subfolder).
|System Requirements:||WinXP / Vista / Win7 / Win8|
|Writes settings to:||Windows registry. But given the nature of the application and the small number of settings it exposes, I think it can be accepted as portable.|
|How to extract:||Download the ZIP package and extract to a folder of your choice. Launch tweakpng.exe.|