is there a site like https://float.exposed for utf-8? Like where you paste in a UTF-8 string and see how it's broken up into Unicode code points?
Float Exposed

Floating point format explorer – binary representations of common floating point formats.

@b0rk https://r12a.github.io/app-analysestring/ by @ri! (Includes Unicode properties & links to the UCD)
Analyse string tool

Tool to analyse what characters are in a string and list information about them.