📖 Guide

ASCII Table — Complete Reference

Full ASCII character table with decimal, hex, and character values for control characters, printable characters, and escape sequences.

112 commands across 6 categories

Control Characters (0-31)Digits (48-57)Uppercase Letters (65-90)Lowercase Letters (97-122)Special CharactersCommon Escape Sequences

Control Characters (0-31)

CommandDescription
0 (0x00) NUL
Null character — string terminator in C/C++
1 (0x01) SOH
Start of Heading
2 (0x02) STX
Start of Text
3 (0x03) ETX
End of Text — Ctrl+C interrupt signal
4 (0x04) EOT
End of Transmission — Ctrl+D EOF signal
5 (0x05) ENQ
Enquiry
6 (0x06) ACK
Acknowledge
7 (0x07) BEL
Bell — triggers audible alert (\a)
8 (0x08) BS
Backspace (\b)
9 (0x09) HT
Horizontal Tab (\t)
10 (0x0A) LF
Line Feed (\n) — Unix newline
11 (0x0B) VT
Vertical Tab (\v)
12 (0x0C) FF
Form Feed (\f) — page break
13 (0x0D) CR
Carriage Return (\r) — Windows newline is CR+LF
14 (0x0E) SO
Shift Out
15 (0x0F) SI
Shift In
16 (0x10) DLE
Data Link Escape
17 (0x11) DC1
Device Control 1 (XON — resume transmission)
18 (0x12) DC2
Device Control 2
19 (0x13) DC3
Device Control 3 (XOFF — pause transmission)
20 (0x14) DC4
Device Control 4
21 (0x15) NAK
Negative Acknowledge
22 (0x16) SYN
Synchronous Idle
23 (0x17) ETB
End of Transmission Block
24 (0x18) CAN
Cancel
25 (0x19) EM
End of Medium
26 (0x1A) SUB
Substitute — Ctrl+Z (EOF on Windows, suspend on Unix)
27 (0x1B) ESC
Escape — starts ANSI escape sequences
28 (0x1C) FS
File Separator
29 (0x1D) GS
Group Separator
30 (0x1E) RS
Record Separator
31 (0x1F) US
Unit Separator

Digits (48-57)

CommandDescription
48 (0x30) '0'
Digit zero. Digits span 0x30-0x39
49 (0x31) '1'
Digit one
50 (0x32) '2'
Digit two
51 (0x33) '3'
Digit three
52 (0x34) '4'
Digit four
53 (0x35) '5'
Digit five
54 (0x36) '6'
Digit six
55 (0x37) '7'
Digit seven
56 (0x38) '8'
Digit eight
57 (0x39) '9'
Digit nine. To convert char to int: charCode - 48

Uppercase Letters (65-90)

CommandDescription
65 (0x41) 'A'
Uppercase A. Letters start at 0x41
66 (0x42) 'B'
Uppercase B
67 (0x43) 'C'
Uppercase C
68 (0x44) 'D'
Uppercase D
69 (0x45) 'E'
Uppercase E
70 (0x46) 'F'
Uppercase F — last hex digit letter
71-76 (0x47-0x4C) G-L
Uppercase G through L
77-82 (0x4D-0x52) M-R
Uppercase M through R
83-88 (0x53-0x58) S-X
Uppercase S through X
89 (0x59) 'Y'
Uppercase Y
90 (0x5A) 'Z'
Uppercase Z. To lowercase: charCode + 32 (or OR 0x20)

Lowercase Letters (97-122)

CommandDescription
97 (0x61) 'a'
Lowercase a. Lowercase starts at 0x61
98 (0x62) 'b'
Lowercase b
99 (0x63) 'c'
Lowercase c
100 (0x64) 'd'
Lowercase d
101 (0x65) 'e'
Lowercase e
102 (0x66) 'f'
Lowercase f — last hex digit letter
103-108 (0x67-0x6C) g-l
Lowercase g through l
109-114 (0x6D-0x72) m-r
Lowercase m through r
115-120 (0x73-0x78) s-x
Lowercase s through x
121 (0x79) 'y'
Lowercase y
122 (0x7A) 'z'
Lowercase z. To uppercase: charCode - 32 (or AND 0xDF)

Special Characters

CommandDescription
32 (0x20) ' '
Space — first printable character
33 (0x21) '!'
Exclamation mark
34 (0x22) '"'
Double quote — string delimiter in many languages
35 (0x23) '#'
Hash / number sign / pound — comments, hex colors, markdown headings
36 (0x24) '$'
Dollar sign — variables in shell/PHP/JS template literals
37 (0x25) '%'
Percent — modulo operator, URL encoding prefix
38 (0x26) '&'
Ampersand — logical AND, HTML entities, shell background
39 (0x27) "'"
Single quote / apostrophe — string delimiter
40-41 (0x28-0x29) '(' ')'
Parentheses — function calls, grouping
42 (0x2A) '*'
Asterisk — multiplication, glob wildcard, pointer dereference
43 (0x2B) '+'
Plus sign — addition, URL space encoding
44 (0x2C) ','
Comma — separator in lists, function arguments
45 (0x2D) '-'
Hyphen/minus — subtraction, CLI flags, negative numbers
46 (0x2E) '.'
Period/dot — decimal point, object access, file extensions
47 (0x2F) '/'
Forward slash — division, URL paths, regex delimiter
58 (0x3A) ':'
Colon — key-value separator, ternary operator, slicing
59 (0x3B) ';'
Semicolon — statement terminator in C/JS/Java
60 (0x3C) '<'
Less than — comparison, HTML tags, shell redirect input
61 (0x3D) '='
Equals — assignment, comparison (==), arrow functions (=>)
62 (0x3E) '>'
Greater than — comparison, HTML tags, shell redirect output
63 (0x3F) '?'
Question mark — ternary operator, optional chaining, URL query string
64 (0x40) '@'
At sign — email addresses, decorators, scoped npm packages
91 (0x5B) '['
Left square bracket — arrays, indexing
92 (0x5C) '\'
Backslash — escape character, Windows path separator
93 (0x5D) ']'
Right square bracket — arrays, indexing
94 (0x5E) '^'
Caret — XOR, regex start-of-line, semver compatible
95 (0x5F) '_'
Underscore — variable names, numeric separator, unused variables
96 (0x60) '`'
Backtick/grave accent — template literals in JS, code in markdown
123 (0x7B) '{'
Left curly brace — blocks, objects, destructuring
124 (0x7C) '|'
Pipe — logical OR, shell pipe, union types
125 (0x7D) '}'
Right curly brace — blocks, objects
126 (0x7E) '~'
Tilde — home directory, bitwise NOT, semver approximately
127 (0x7F) DEL
Delete — last ASCII character, non-printable

Common Escape Sequences

CommandDescription
\n (0x0A)
Newline / Line Feed — Unix line ending
\r (0x0D)
Carriage Return — used with \n for Windows line endings (\r\n)
\t (0x09)
Horizontal Tab — indentation, TSV files
\0 (0x00)
Null character — C string terminator
\\ (0x5C)
Literal backslash
\' (0x27)
Literal single quote inside single-quoted strings
\" (0x22)
Literal double quote inside double-quoted strings
\a (0x07)
Bell/alert — audible beep
\b (0x08)
Backspace
\f (0x0C)
Form feed — page break in printing
\v (0x0B)
Vertical tab
\xNN
e.g. \x41 = 'A'
Hex escape — character by hex code
\uNNNN
e.g. \u0041 = 'A', \u00E9 = 'é'
Unicode escape (4 hex digits)
\u{NNNNNN}
e.g. \u{1F600} = '😀'
Unicode escape (variable length, ES6+)
\NNN
e.g. \101 = 'A'
Octal escape — character by octal code

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