Show contents of the Windows clipboard

NirSoft offers a free “Inside Clipboard” utility which allows you to see the raw clipboard contents and different formats. It’s close to what you would see with a programmatic API but with a nice GUI. Its GUI includes hex view. It also allows data to be exported and allows saving a snapshot to a .clp file which it can open and allow you to examine later.

If you need to see things at the level of the programmatic API to quick check things without writing a program yourself, I recommend this tool.

There is a list of clipboard manager tools at Wikipedia: Clipboard manager

ClipX allows you to view a log of previous clipboard entries by pressing Ctrl + Shift + V.

If using .NET you can query the Clipboard object.