nomacs is a cross-platform image viewer application used for viewing and managing a wide variety of standard and specialized image file formats. It functions as an image processing utility, a metadata inspector, and an annotation tool.
The application enables side-by-side image comparison by synchronizing zooming and panning across multiple open windows. It also provides the ability to browse and view images embedded within compressed archives or document files without manual extraction.
The software includes capabilities for image metadata analysis using histograms, the addition of visual marks through annotation tools, and the refinement of image properties. Users can also filter file lists using strings or regular expressions to narrow their current view.