ASCII Table.
All 128 ASCII codes in one place — decimal, hexadecimal, octal, binary, the printable character, and the names of the control codes. Search by number (65, 0x41), by character (A), or by name (ESC). It's a reference; nothing is sent anywhere.
| Char | Dec | Hex | Oct | Binary | Name |
|---|
What ASCII is.
ASCII (American Standard Code for Information Interchange) maps the numbers 0–127 to characters. 0–31 and 127 are control codes — non-printing instructions like LF (line feed, 10), CR (carriage return, 13), TAB (9), and ESC (27). 32 is space, and 33–126 are the printable letters, digits, and punctuation.
Handy patterns fall out of the layout: uppercase A is 65 and lowercase a is 97 — exactly 32 apart, which is a single bit, so flipping bit 5 toggles case. Digits 0–9 start at 48, so subtracting 48 ('0') turns a digit character into its value.
ASCII is the 7-bit foundation that UTF-8 is backward-compatible with: every ASCII byte is a valid, identical UTF-8 character, which is why these codes still matter decades later.