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 Another option I haven't seen in your replies:

https://apps.timwhitlock.info/unicode/inspect

Unicode character inspector

Examine Unicode characters in UTF-8 encoded strings

apps.timwhitlock.info