DeveloperInformationEducation

ASCII Table

Full ASCII reference (0-127) with decimal, hex, octal, binary, character, and HTML entity columns. Searchable, grouped by control and printable.

ALatin Capital Letter A

Dec

Hex

0x41

Oct

101

Bin

01000001

HTML

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

What is ASCII?

ASCII — the American Standard Code for Information Interchange — was published by ANSI in 1963 to give every English letter, digit, and common symbol a single, unambiguous numeric code. It uses 7 bits per character, giving exactly 128 codepoints (0–127). The first 32 plus code 127 are control characters; the remaining 95 (codes 32–126) are printable glyphs.

ASCII underpins almost every modern text encoding. It became the base layer of ISO/IEC 646 in 1972, was extended by national variants and 8-bit code pages, and ultimately became the first 128 codepoints of Unicode. Today the codes you see in this table are bit-for-bit identical to the first byte range of UTF-8 — six decades later, the original choices still drive the web.

Control vs printable

Control characters (0–31, 127)

Non-displayable signaling codes inherited from teletype and early terminals. They drive cursor movement, line endings (LF / CR), bell, tab, escape sequences, and end-of-file markers. Most are invisible in modern text but still meaningful to shells, printers, and serial protocols.

Printable characters (32–126)

Visible glyphs starting with space (32) through tilde (126). This range covers the 10 digits, both letter cases, and a curated set of punctuation marks that became the foundation of virtually every programming language and file format.

HTML entities — when to escape

HTML reserves a handful of ASCII characters for its own syntax. If you want them to appear as literal text in the rendered page, you must replace them with an entity reference — a named token like & or a numeric form like &.

Inside HTML body text: always escape &, <, and > as &, <, >.
Inside attribute values: also escape " as ". If the attribute uses single quotes, escape ' as ' instead.
Named vs numeric: Named entities like © are easier to read but limited to a defined list. Numeric entities like © or hex © work for any Unicode codepoint.
XML & XHTML: only five entities are predefined — &, <, >, ", and '. Anything else must be numeric.

Beyond ASCII — Unicode & UTF-8

ASCII forms the first 128 codepoints (U+0000 to U+007F) of Unicode. UTF-8 was designed so that those codepoints encode to a single byte, unchanged from their ASCII value. The practical consequence: every valid ASCII file is already a valid UTF-8 file, and any tool that processes UTF-8 byte-by-byte handles ASCII text correctly without special cases. Higher codepoints — accented Latin, CJK, emoji — use two to four bytes, but the original 128 stay stable forever.