ExifTool is one of the best programs for editing image metadata. However, it is a command-line utility, which means that it may be difficult to use for those unfamiliar with commands/CLI. ExifToolGUI bridges the gap by providing a GUI (graphic user interface) that makes many of ExifTool’s most useful features easily accessible.
Occasionally, images may appear horizontally or vertically stretched in Windows Photo Viewer.1 One possible explanation for this is that somewhere along the way the images’ metadata for their x and y-resolutions became corrupted. In order to correct this, you need to edit the images’ metadata. ExifTool is one of the best programs for editing metadata.
How to Edit Image Metadata with ExifTool
1. Download ExifTool. If you don’t know Perl (a programming language), I recommend downloading the stand-alone Windows executable, or the Mac OS X package if you’re a Mac user. ExifTool is lightweight (3.5 MB) and portable, so you don’t need to worry about it cluttering up your system.