pngcheck can check PNG files integrity with the help of this tool. pngcheck is a simple, easy to use application designed to verify the integrity of PNG, JNG and MNG files by checking the internal 32-bit CRCs [checksums] and decompressing the image data.
It can optionally dump almost all of the chunk-level information in the image in human-readable form. For example, it can be used to print the basic statistics about an image (dimensions, bit depth, etc.); to list the color and transparency info in its palette (assuming it has one); or to extract the embedded text annotations.

PNG (Portable Network Graphics image format) and MNG (Multiple-image Network Graphics image and animation format) home sites.

The license of this software is Free, you can free download and free use this file compare software.