pngcheck
Verify PNG file integrity and structure
TLDR
Check PNG file for integrity
$ pngcheck [image.png]
Verbose output (per-chunk details)$ pngcheck -v [image.png]
Check multiple files$ pngcheck [*.png]
Colorized output$ pngcheck -c [image.png]
Print text chunks (titles, comments, etc.)$ pngcheck -t [image.png]
Quiet mode - only show errors$ pngcheck -q [image.png]
Search for embedded PNGs in a file$ pngcheck -s [file]
SYNOPSIS
pngcheck [-cfpqstvx7] file...
DESCRIPTION
pngcheck verifies the integrity and structure of PNG, JNG, and MNG image files. It validates CRC checksums, checks chunk ordering, and reports structural errors or corruption.In verbose mode it lists each chunk with dimensions, color type, bit depth, compression method, and filter type. With -t it prints embedded text metadata (tEXt, zTXt, iTXt). With -s it can locate PNG/MNG images embedded in other files, and -x can extract them.
PARAMETERS
FILE
PNG, JNG, or MNG file(s) to check.-v
Verbose mode; show details of each chunk.-c
Colorize text output.-f
Force continuation after major errors.-p
Print contents of PLTE, tRNS, hIST, sPLT, and PPLT chunks.-q
Quiet mode; only show errors and warnings.-s
Search for sub-images (embedded PNGs/MNGs) in a file.-t
Print contents of tEXt, zTXt, and iTXt text chunks.-x
Search for and extract sub-images (use with -s).-7
Print tEXt chunks in 7-bit clean ASCII (escape high bytes).--help
Display help.
INSTALL
sudo apt install pngcheck
sudo dnf install pngcheck
sudo zypper install pngcheck
brew install pngcheck
nix profile install nixpkgs#pngcheck
CAVEATS
PNG/JNG/MNG formats. Read-only analysis.
HISTORY
pngcheck was created for PNG file validation and inspection.