It gets a little tiny bit out of whack with Zalgo text.

e.g., https://text.makeup/#P%CC%B4%CD%82%CC%96h%CC%B4%CC%84%CC%8E%...

edit: in fact, due to all the combining marks it will only paste 14 chars of my text into the box. I originally typed: "Ph’nglui mglw’nafh Cthulhu R’lyeh wgah’nagl fhtagn." into the Zalgo generator and tried to paste that output in.

https://zalgo.org/

Great website. I've been using a similar tool a lot lately for UTF-8 work:

https://unicode.scarfboy.com/

Just in case, from the command line I recommend uni: https://github.com/arp242/uni

https://babelstone.co.uk/Unicode/whatisit.html works well for me for this purpose. It shows all the names and code points.

I never knew emoji variants and stuff worked like that.. Fantastic tool, intuitive interface.

While numerous similar tools do already exist, I think an inline annotation is a neat interface and can be leveraged much more. Font requirements, segmentation boundaries, script detection and many others.