Character Map shows everything you need to reference or encode a character: its U+ code point, decimal value, HTML entity, hex and decimal numeric references, JavaScript and CSS escapes, and its UTF-8 bytes.
It also renders the classic ASCII table and several common Unicode blocks. It runs in your browser.
It names the ASCII control and printable set. For other characters it gives the code point and encodings but not the official Unicode name, to keep the tool small.
Use it in a content property or a selector, for example \41 for the letter A.
Handy when debugging encoding issues: a character above U+007F takes two to four bytes.
No. The tool runs entirely on this page.