/tools/ascii-unicode takes any string and lists every codepoint with its encoding details:

• Codepoint as U+XXXX and decimal.
• UTF-8 byte sequence (1 to 4 bytes per codepoint).
• UTF-16 code units (surrogate pairs decoded).
• HTML entity in decimal (😀) and hex (😀) form.
• CSS escape (\1F600 ).
• Unicode block name (Basic Latin, Latin-1 Supplement, CJK Unified Ideographs, Emoticons, etc.).

Designed for debugging weird text — a zero-width space pasted into a config file, a Cyrillic look-alike in a domain, a combining diacritic that won't normalise, or that one emoji that turns into a surrogate-pair mess in your backend log. Runs entirely in your browser.