TweakPNG

TweakPNG examines different chunks in a PNG file and decode the information contained in each of these.
Homepage:	https://entropymine.com/jason/tweakpng/
Source Code:	https://github.com/jsummers/tweakpng
License:	GPL-3.0 license
Platforms:	Windows XP and higher
Language:	English
Input Formats:	PNG
Function:	Forensic,Metadata Extraction,Validation
Content type:	Image

Description

TweakPNG reveals the internal structure of PNGs by showing every chunk it contains, its length, type, CRC, and attribute. It decodes the content of metadata chunks. It can also check the validity of the file, edit and add new chunks and import an ICC profile.

User Experience

Ange Albertini demonstrates the use of the tool in his video on PNG basics.