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ASCII Table — Complete Character Code Reference

Full ASCII table with all 128 characters showing decimal, hexadecimal, octal, binary values and descriptions for control characters and printable characters.

Updated Reference

ASCII (American Standard Code for Information Interchange) assigns numeric values to 128 characters. These include control characters (0-31, 127), printable characters (32-126), and the standard Latin alphabet. ASCII is the foundation of virtually all modern character encoding systems including UTF-8.

Control Characters (0-31, 127)

These non-printable characters were originally designed to control hardware devices like printers and telephones. Many still serve purposes in modern computing.

Dec Hex Oct Char Name Description
0 00 000 NUL Null String terminator in C
1 01 001 SOH Start of Heading Start of header
2 02 002 STX Start of Text Start of text body
3 03 003 ETX End of Text Often used as Ctrl+C (interrupt)
4 04 004 EOT End of Transmission Ctrl+D (end of input)
5 05 005 ENQ Enquiry Request for response
6 06 006 ACK Acknowledge Positive acknowledgement
7 07 007 BEL Bell Terminal bell/beep (\a)
8 08 010 BS Backspace Move cursor back (\b)
9 09 011 HT Horizontal Tab Tab character (\t)
10 0A 012 LF Line Feed Newline on Unix/macOS (\n)
11 0B 013 VT Vertical Tab Vertical tab (\v)
12 0C 014 FF Form Feed Page break (\f)
13 0D 015 CR Carriage Return Newline on old Mac; \r\n on Windows (\r)
14 0E 016 SO Shift Out Switch to alternate character set
15 0F 017 SI Shift In Return to default character set
16 10 020 DLE Data Link Escape Control character for data links
17 11 021 DC1 Device Control 1 XON — resume transmission
18 12 022 DC2 Device Control 2
19 13 023 DC3 Device Control 3 XOFF — pause transmission
20 14 024 DC4 Device Control 4
21 15 025 NAK Negative Acknowledge Negative acknowledgement
22 16 026 SYN Synchronous Idle Synchronization
23 17 027 ETB End of Transmission Block End of data block
24 18 030 CAN Cancel Cancel previous data
25 19 031 EM End of Medium End of storage medium
26 1A 032 SUB Substitute Ctrl+Z (EOF on Windows)
27 1B 033 ESC Escape Start of escape sequences
28 1C 034 FS File Separator Delimiter
29 1D 035 GS Group Separator Delimiter
30 1E 036 RS Record Separator Delimiter
31 1F 037 US Unit Separator Delimiter
127 7F 177 DEL Delete Delete character

Printable Characters (32-126)

Dec Hex Oct Char Dec Hex Oct Char Dec Hex Oct Char
32 20 040 (space) 64 40 100 @ 96 60 140 `
33 21 041 ! 65 41 101 A 97 61 141 a
34 22 042 " 66 42 102 B 98 62 142 b
35 23 043 # 67 43 103 C 99 63 143 c
36 24 044 $ 68 44 104 D 100 64 144 d
37 25 045 % 69 45 105 E 101 65 145 e
38 26 046 & 70 46 106 F 102 66 146 f
39 27 047 ' 71 47 107 G 103 67 147 g
40 28 050 ( 72 48 110 H 104 68 150 h
41 29 051 ) 73 49 111 I 105 69 151 i
42 2A 052 * 74 4A 112 J 106 6A 152 j
43 2B 053 + 75 4B 113 K 107 6B 153 k
44 2C 054 , 76 4C 114 L 108 6C 154 l
45 2D 055 - 77 4D 115 M 109 6D 155 m
46 2E 056 . 78 4E 116 N 110 6E 156 n
47 2F 057 / 79 4F 117 O 111 6F 157 o
48 30 060 0 80 50 120 P 112 70 160 p
49 31 061 1 81 51 121 Q 113 71 161 q
50 32 062 2 82 52 122 R 114 72 162 r
51 33 063 3 83 53 123 S 115 73 163 s
52 34 064 4 84 54 124 T 116 74 164 t
53 35 065 5 85 55 125 U 117 75 165 u
54 36 066 6 86 56 126 V 118 76 166 v
55 37 067 7 87 57 127 W 119 77 167 w
56 38 070 8 88 58 130 X 120 78 170 x
57 39 071 9 89 59 131 Y 121 79 171 y
58 3A 072 : 90 5A 132 Z 122 7A 172 z
59 3B 073 ; 91 5B 133 [ 123 7B 173 {
60 3C 074 < 92 5C 134 \ 124 7C 174 |
61 3D 075 = 93 5D 135 ] 125 7D 175 }
62 3E 076 > 94 5E 136 ^ 126 7E 176 ~
63 3F 077 ? 95 5F 137 _

Key Ranges

Range Dec Hex Contents
Control chars 0-31 00-1F Non-printable control codes
Space 32 20 The space character
Digits 0-9 48-57 30-39 Numeric characters
Uppercase A-Z 65-90 41-5A Capital letters
Lowercase a-z 97-122 61-7A Lowercase letters
DEL 127 7F Delete control character

Useful Conversions

# Uppercase to lowercase: add 32
'A' (65) + 32 = 'a' (97)

# Lowercase to uppercase: subtract 32
'a' (97) - 32 = 'A' (65)

# Digit char to number: subtract 48
'7' (55) - 48 = 7

# Number to digit char: add 48
7 + 48 = '7' (55)

# Check if printable: 32 <= code <= 126

ASCII vs Unicode

ASCII covers only 128 characters (7 bits). Unicode extends this to over 149,000 characters across all writing systems. UTF-8, the dominant encoding on the web, is backward-compatible with ASCII: the first 128 UTF-8 code points are identical to ASCII.

Explore the full table interactively with the ASCII Table tool, or convert between formats with ASCII to Hex and Hex to Text.

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More guides

CheatsheetASCII Table — Complete Character Code ReferenceGlossaryWhat is ASCII?GlossaryWhat is Hexadecimal?