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TweakPNG is a useful and easy to use application which allows you to view PNG files' details.

TweakPNG is a low-level utility for examining and modifying PNG image files. In order to use TweakPNG you have to be at least somewhat familiar with the internal format of PNG files.

TweakPNG is an interactive PNG file editor utility that allows you to view
and modify some of the meta-information stored in PNG image files. It is not a real image editor or viewer.

TweakPNG does include a simple image viewer, but it only passively displays the current state of the file.

You can use TweakPNG:
· To remove unneeded or unwanted chunks, usually to reduce file size.
· To annotate an image file by adding or modifying text chunks.
· To change background colors and transparency settings.
· To help make test images for testing applications that read PNG files.