There are many tools for viewing/editing metadata inside image files. In my opinion, ExifTool by Phil Harvey, is the best I've found so far. Here's why:
The only downside for many potential users is the fact, that ExifTool is a "command-line" utility. That means, there's no Graphic User Interface (GUI), so all work must be done by typing commands inside "Command Prompt" window. Such approach gives ExifTool great flexibility, but is somehow difficult to use -especially for those, who don't use ExifTool regulary.
Full information here: https://exiftool.org/gui/