ASCII Table — Decimal, Hex, Binary, Octal & Character Chart

Browse all 128 ASCII codes (0–127) with their decimal, hexadecimal, octal, and binary representations. Control characters (0–31, 127) are highlighted and labeled with their standard abbreviations and full names. Filter to show only printable characters or only control codes, and search by decimal number, hex value, or character.

Dec	Hex	Oct	Binary	Char	Description
0	0x00	000	00000000	NUL	NUL — Null
1	0x01	001	00000001	SOH	SOH — Start of Heading
2	0x02	002	00000010	STX	STX — Start of Text
3	0x03	003	00000011	ETX	ETX — End of Text
4	0x04	004	00000100	EOT	EOT — End of Transmission
5	0x05	005	00000101	ENQ	ENQ — Enquiry
6	0x06	006	00000110	ACK	ACK — Acknowledge
7	0x07	007	00000111	BEL	BEL — Bell
8	0x08	010	00001000	BS	BS — Backspace
9	0x09	011	00001001	HT	HT — Horizontal Tab
10	0x0A	012	00001010	LF	LF — Line Feed
11	0x0B	013	00001011	VT	VT — Vertical Tab
12	0x0C	014	00001100	FF	FF — Form Feed
13	0x0D	015	00001101	CR	CR — Carriage Return
14	0x0E	016	00001110	SO	SO — Shift Out
15	0x0F	017	00001111	SI	SI — Shift In
16	0x10	020	00010000	DLE	DLE — Data Link Escape
17	0x11	021	00010001	DC1	DC1 — Device Control 1 (XON)
18	0x12	022	00010010	DC2	DC2 — Device Control 2
19	0x13	023	00010011	DC3	DC3 — Device Control 3 (XOFF)
20	0x14	024	00010100	DC4	DC4 — Device Control 4
21	0x15	025	00010101	NAK	NAK — Negative Acknowledge
22	0x16	026	00010110	SYN	SYN — Synchronous Idle
23	0x17	027	00010111	ETB	ETB — End of Transmission Block
24	0x18	030	00011000	CAN	CAN — Cancel
25	0x19	031	00011001	EM	EM — End of Medium
26	0x1A	032	00011010	SUB	SUB — Substitute
27	0x1B	033	00011011	ESC	ESC — Escape
28	0x1C	034	00011100	FS	FS — File Separator
29	0x1D	035	00011101	GS	GS — Group Separator
30	0x1E	036	00011110	RS	RS — Record Separator
31	0x1F	037	00011111	US	US — Unit Separator
32	0x20	040	00100000		SP — Space
33	0x21	041	00100001	!
34	0x22	042	00100010	"
35	0x23	043	00100011	#
36	0x24	044	00100100	$
37	0x25	045	00100101	%
38	0x26	046	00100110	&
39	0x27	047	00100111	'
40	0x28	050	00101000	(
41	0x29	051	00101001	)
42	0x2A	052	00101010	*
43	0x2B	053	00101011	+
44	0x2C	054	00101100	,
45	0x2D	055	00101101	-
46	0x2E	056	00101110	.
47	0x2F	057	00101111	/
48	0x30	060	00110000	0
49	0x31	061	00110001	1
50	0x32	062	00110010	2
51	0x33	063	00110011	3
52	0x34	064	00110100	4
53	0x35	065	00110101	5
54	0x36	066	00110110	6
55	0x37	067	00110111	7
56	0x38	070	00111000	8
57	0x39	071	00111001	9
58	0x3A	072	00111010	:
59	0x3B	073	00111011	;
60	0x3C	074	00111100	<
61	0x3D	075	00111101	=
62	0x3E	076	00111110	>
63	0x3F	077	00111111	?
64	0x40	100	01000000	@
65	0x41	101	01000001	A
66	0x42	102	01000010	B
67	0x43	103	01000011	C
68	0x44	104	01000100	D
69	0x45	105	01000101	E
70	0x46	106	01000110	F
71	0x47	107	01000111	G
72	0x48	110	01001000	H
73	0x49	111	01001001	I
74	0x4A	112	01001010	J
75	0x4B	113	01001011	K
76	0x4C	114	01001100	L
77	0x4D	115	01001101	M
78	0x4E	116	01001110	N
79	0x4F	117	01001111	O
80	0x50	120	01010000	P
81	0x51	121	01010001	Q
82	0x52	122	01010010	R
83	0x53	123	01010011	S
84	0x54	124	01010100	T
85	0x55	125	01010101	U
86	0x56	126	01010110	V
87	0x57	127	01010111	W
88	0x58	130	01011000	X
89	0x59	131	01011001	Y
90	0x5A	132	01011010	Z
91	0x5B	133	01011011	[
92	0x5C	134	01011100	\
93	0x5D	135	01011101	]
94	0x5E	136	01011110	^
95	0x5F	137	01011111	_
96	0x60	140	01100000	`
97	0x61	141	01100001	a
98	0x62	142	01100010	b
99	0x63	143	01100011	c
100	0x64	144	01100100	d
101	0x65	145	01100101	e
102	0x66	146	01100110	f
103	0x67	147	01100111	g
104	0x68	150	01101000	h
105	0x69	151	01101001	i
106	0x6A	152	01101010	j
107	0x6B	153	01101011	k
108	0x6C	154	01101100	l
109	0x6D	155	01101101	m
110	0x6E	156	01101110	n
111	0x6F	157	01101111	o
112	0x70	160	01110000	p
113	0x71	161	01110001	q
114	0x72	162	01110010	r
115	0x73	163	01110011	s
116	0x74	164	01110100	t
117	0x75	165	01110101	u
118	0x76	166	01110110	v
119	0x77	167	01110111	w
120	0x78	170	01111000	x
121	0x79	171	01111001	y
122	0x7A	172	01111010	z
123	0x7B	173	01111011	{
124	0x7C	174	01111100	\|
125	0x7D	175	01111101	}
126	0x7E	176	01111110	~
127	0x7F	177	01111111	DEL	DEL — Delete

Showing 128 of 128 ASCII codes

How it works

What is ASCII?

ASCII (American Standard Code for Information Interchange) is a character encoding standard originally published in 1963. It defines 128 characters: 33 non-printing control characters (codes 0–31 and 127) and 95 printable characters (codes 32–126), including uppercase and lowercase English letters, digits 0–9, and common punctuation marks. ASCII became the foundation for virtually every modern text encoding, including UTF-8, which is backward-compatible with ASCII for the first 128 code points.

Each ASCII character is assigned a 7-bit integer value, which is why the table stops at 127 (2⁷ − 1). When stored in an 8-bit byte, the leading bit is typically 0 for standard ASCII. The extended ASCII range (128–255) is not standardized by the original spec and varies by code page — ISO 8859-1, Windows-1252, and similar encodings each define a different set of characters for the upper half of the byte.

Control characters (0–31 and 127)

The first 32 ASCII codes and code 127 are non-printing control characters inherited from teletype machine conventions. Most are obsolete in modern computing, but several remain important: code 9 (HT, horizontal tab), code 10 (LF, line feed or newline on Unix/Linux), code 13 (CR, carriage return, used in Windows line endings as CR+LF), code 27 (ESC, Escape, used in terminal escape sequences), and code 127 (DEL). These characters are not rendered as visible glyphs.

On Unix-like systems, you can generate control characters in a terminal by holding Ctrl and pressing the corresponding letter: Ctrl+A = SOH (1), Ctrl+C = ETX (3, sends interrupt signal), Ctrl+D = EOT (4, signals end of input), Ctrl+J = LF (10), Ctrl+M = CR (13), Ctrl+Z = SUB (26, suspends a process on Unix). Understanding these codes is essential for low-level I/O, terminal control sequences, and network protocol implementation.

ASCII in programming and web development

In JavaScript, you can get the ASCII code of a character using charCodeAt(0): 'A'.charCodeAt(0) returns 65. To convert back, use String.fromCharCode(65) to get 'A'. In Python, ord('A') returns 65 and chr(65) returns 'A'. In C, char values are integers and can be used directly in arithmetic: 'A' + 1 equals 'B'.

ASCII values are the basis for many common programming patterns. The difference between uppercase and lowercase letters is always 32: 'a' (97) = 'A' (65) + 32. Digits 0–9 occupy codes 48–57, so subtracting 48 from a digit character's ASCII value gives its numeric value. URL encoding represents non-URL-safe characters as %XX where XX is the hex ASCII code, making this table essential for debugging URL-encoded strings and HTTP headers.

Frequently asked questions

›What is the ASCII code for Enter / newline?

The newline (line feed) character is ASCII code 10 (0x0A, LF). On Unix/Linux/macOS, a newline is represented by LF alone. On Windows, a newline is CR+LF (codes 13 and 10, or 0x0D 0x0A). The carriage return character is code 13 (0x0D, CR). When writing cross-platform text processing code, always handle both LF and CR+LF line endings.

›What is the ASCII code for the space character?

The space character is ASCII code 32 (0x20, SP). It is the first printable ASCII character. The non-breaking space (used in HTML as  ) is not part of standard 7-bit ASCII — it is code 160 (0xA0) in ISO 8859-1 and UTF-8 (encoded as 0xC2 0xA0 in UTF-8).

›What is the difference between ASCII, UTF-8, and Unicode?

ASCII defines 128 characters with 7-bit codes. Unicode is a universal standard that defines over 140,000 characters with code points up to U+10FFFF. UTF-8 is a variable-width encoding of Unicode: it encodes ASCII characters (0–127) in a single byte, making it backward-compatible with ASCII. Characters beyond 127 use 2–4 bytes in UTF-8. Modern text systems use UTF-8 or UTF-16, but ASCII remains important for protocol headers, file formats, and legacy systems.

›How do I find the ASCII code of a character in JavaScript?

Use charCodeAt(0): 'A'.charCodeAt(0) returns 65. For Unicode code points beyond 65535, use codePointAt(0) instead. To convert a code back to a character: String.fromCharCode(65) returns 'A'. For full Unicode support: String.fromCodePoint(128512) returns the 😀 emoji.

›What does ASCII code 0 (NUL) do?

NUL (code 0) is the null character. In C and many other languages, it is used as a string terminator — a string 'Hello' is stored in memory as the bytes 72, 101, 108, 108, 111, 0. In databases and file formats, NUL can appear as a field separator or padding byte. In most text editors and terminals, NUL is invisible and ignored, but it can cause problems when reading binary files as text.

›What is the Escape character (ASCII 27)?

ESC (code 27, 0x1B) is the Escape character. It is the start of ANSI/VT100 escape sequences, which control terminal colors and cursor movement. For example, the sequence ESC[31m changes the terminal text color to red. In many applications, pressing the Escape key sends this character. It is also used in various data formats and communication protocols.

›Why does uppercase A have ASCII code 65 and lowercase a have 97?

The ASCII table was designed so that uppercase letters (A=65, B=66, ..., Z=90) and lowercase letters (a=97, b=98, ..., z=122) differ by exactly 32. This allows converting between cases with a single addition or subtraction. To convert uppercase to lowercase in ASCII: add 32 (or set bit 5). To convert lowercase to uppercase: subtract 32 (or clear bit 5). This is why bitwise case conversion works in C: char lower = upper | 0x20.

›What is the difference between CR, LF, and CRLF?

CR (Carriage Return, code 13) and LF (Line Feed, code 10) originated from typewriter/teletype conventions. CR moves the print head to the beginning of the line; LF advances to the next line. Unix/Linux uses LF alone for newlines. Windows uses CR+LF (both together). Classic Mac OS (before OS X) used CR alone. Most modern parsers handle all three, but mixing line endings in source files causes problems with version control diffs and some text processors.

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Last updated: 2026-05-18

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