Clipboard viewer for OS X that allows extracting the data in any available format
You can see the different types by running the clipboard as record in AppleScript Editor.
the clipboard, the clipboard as text, or Unicode text of (the clipboard as record) will return a plain text version. AppleScript still converts line endings to CR though.
The MacOSX developer tools come with an example app called "ClipboardViewer.app" and its source for Xcode. This is by far the most explicit clipboard exploration tool I've found for MacOSX: it shows the string of the clipboard flavour (called UTI on MacOSX) and a hex dump of the content.
Here is an example screenshot made with this app (using a Mathematica source). It would be cool if such a project could be made into an open-source project for MacOSX instead of being a dev-tool-thing. However, there's a public web-page of Apple dev support, where you can download the sample project and compile it using XCode; as of today (late 2018), one needs to let the suggested be applied such as chaning architecture from 32 to 64 bits; after this all compiles well.
https://langui.net/clipboard-viewer/ as suggested by Paul Libbrecht works perfectly!
If you just want to see what types are available, you can run
osascript -e 'clipboard info'
Example output:
«class weba», 974, «class RTF », 425, «class HTML», 604, «class utf8», 16, «class ut16», 34, string, 16, Unicode text, 32
Compare this with
osascript -e 'the clipboard as record'
which might output a mess that doesn’t let you easily see just the types.
«class weba»:«data weba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», «class RTF »:«data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», «class HTML»:«data HTML3C7370616E207374796C653D2263617265742D636F6C6F723A207267622833352C2033382C203431293B20636F6C6F723A207267622833352C2033382C203431293B20666F6E742D66616D696C793A202D6170706C652D73797374656D2C20426C696E6B4D616353797374656D466F6E742C202671756F743B5365676F652055492671756F743B2C202671756F743B4C696265726174696F6E2053616E732671756F743B2C2073616E732D73657269663B20666F6E742D73697A653A20313370783B20666F6E742D7374796C653A206E6F726D616C3B20666F6E742D76617269616E742D636170733A206E6F726D616C3B20666F6E742D7765696768743A206E6F726D616C3B206C65747465722D73706163696E673A206E6F726D616C3B206F727068616E733A206175746F3B20746578742D616C69676E3A206C6566743B20746578742D696E64656E743A203070783B20746578742D7472616E73666F726D3A206E6F6E653B2077686974652D73706163653A206E6F726D616C3B207769646F77733A206175746F3B20776F72642D73706163696E673A203070783B202D7765626B69742D746578742D73697A652D61646A7573743A206175746F3B202D7765626B69742D746578742D7374726F6B652D77696474683A203070783B206261636B67726F756E642D636F6C6F723A20726762283235352C203235352C20323535293B20746578742D6465636F726174696F6E3A206E6F6E653B20646973706C61793A20696E6C696E652021696D706F7274616E743B20666C6F61743A206E6F6E653B223E436C6970626F617264205669657765723C2F7370616E3E», «class utf8»:Clipboard Viewer, «class ut16»:Clipboard Viewer, string:Clipboard Viewer, Unicode text:Clipboard Viewer