Developer Reference

ASCII table

128 results

Control codes

Dec	Hex	Oct	Binary	Char	HTML
0	00	000	00000000	NUL	null
1	01	001	00000001	SOH	start of heading
2	02	002	00000010	STX	start of text
3	03	003	00000011	ETX	end of text
4	04	004	00000100	EOT	end of transmission
5	05	005	00000101	ENQ	enquiry
6	06	006	00000110	ACK	acknowledge
7	07	007	00000111	BEL	bell
8	08	010	00001000	BS	backspace
9	09	011	00001001	HT	horizontal tab
10	0A	012	00001010	LF	line feed
11	0B	013	00001011	VT	vertical tab
12	0C	014	00001100	FF	form feed
13	0D	015	00001101	CR	carriage return
14	0E	016	00001110	SO	shift out
15	0F	017	00001111	SI	shift in
16	10	020	00010000	DLE	data link escape
17	11	021	00010001	DC1	device control 1
18	12	022	00010010	DC2	device control 2
19	13	023	00010011	DC3	device control 3
20	14	024	00010100	DC4	device control 4
21	15	025	00010101	NAK	negative acknowledge
22	16	026	00010110	SYN	synchronous idle
23	17	027	00010111	ETB	end of block
24	18	030	00011000	CAN	cancel
25	19	031	00011001	EM	end of medium
26	1A	032	00011010	SUB	substitute
27	1B	033	00011011	ESC	escape
28	1C	034	00011100	FS	file separator
29	1D	035	00011101	GS	group separator
30	1E	036	00011110	RS	record separator
31	1F	037	00011111	US	unit separator

Punctuation

Dec	Hex	Oct	Binary	Char	HTML
32	20	040	00100000	SP	space
33	21	041	00100001	!	!
34	22	042	00100010	"	"
35	23	043	00100011	#	#
36	24	044	00100100	$	$
37	25	045	00100101	%	%
38	26	046	00100110	&	&
39	27	047	00100111	'	'
40	28	050	00101000	(	(
41	29	051	00101001	)	)
42	2A	052	00101010	*	*
43	2B	053	00101011	+	+
44	2C	054	00101100	,	,
45	2D	055	00101101	-	-
46	2E	056	00101110	.	.
47	2F	057	00101111	/	/

Digits

Dec	Hex	Oct	Binary	Char	HTML
48	30	060	00110000	0	0
49	31	061	00110001	1	1
50	32	062	00110010	2	2
51	33	063	00110011	3	3
52	34	064	00110100	4	4
53	35	065	00110101	5	5
54	36	066	00110110	6	6
55	37	067	00110111	7	7
56	38	070	00111000	8	8
57	39	071	00111001	9	9

Punctuation

Dec	Hex	Oct	Binary	Char	HTML
58	3A	072	00111010	:	:
59	3B	073	00111011	;	;
60	3C	074	00111100	<	<
61	3D	075	00111101	=	=
62	3E	076	00111110	>	>
63	3F	077	00111111	?	?
64	40	100	01000000	@	@

Uppercase

Dec	Hex	Oct	Binary	Char	HTML
65	41	101	01000001	A	A
66	42	102	01000010	B	B
67	43	103	01000011	C	C
68	44	104	01000100	D	D
69	45	105	01000101	E	E
70	46	106	01000110	F	F
71	47	107	01000111	G	G
72	48	110	01001000	H	H
73	49	111	01001001	I	I
74	4A	112	01001010	J	J
75	4B	113	01001011	K	K
76	4C	114	01001100	L	L
77	4D	115	01001101	M	M
78	4E	116	01001110	N	N
79	4F	117	01001111	O	O
80	50	120	01010000	P	P
81	51	121	01010001	Q	Q
82	52	122	01010010	R	R
83	53	123	01010011	S	S
84	54	124	01010100	T	T
85	55	125	01010101	U	U
86	56	126	01010110	V	V
87	57	127	01010111	W	W
88	58	130	01011000	X	X
89	59	131	01011001	Y	Y
90	5A	132	01011010	Z	Z

Punctuation

Dec	Hex	Oct	Binary	Char	HTML
91	5B	133	01011011	[	[
92	5C	134	01011100	\	\
93	5D	135	01011101	]	]
94	5E	136	01011110	^	^
95	5F	137	01011111	_	_
96	60	140	01100000	`	`

Lowercase

Dec	Hex	Oct	Binary	Char	HTML
97	61	141	01100001	a	a
98	62	142	01100010	b	b
99	63	143	01100011	c	c
100	64	144	01100100	d	d
101	65	145	01100101	e	e
102	66	146	01100110	f	f
103	67	147	01100111	g	g
104	68	150	01101000	h	h
105	69	151	01101001	i	i
106	6A	152	01101010	j	j
107	6B	153	01101011	k	k
108	6C	154	01101100	l	l
109	6D	155	01101101	m	m
110	6E	156	01101110	n	n
111	6F	157	01101111	o	o
112	70	160	01110000	p	p
113	71	161	01110001	q	q
114	72	162	01110010	r	r
115	73	163	01110011	s	s
116	74	164	01110100	t	t
117	75	165	01110101	u	u
118	76	166	01110110	v	v
119	77	167	01110111	w	w
120	78	170	01111000	x	x
121	79	171	01111001	y	y
122	7A	172	01111010	z	z

Punctuation

Dec	Hex	Oct	Binary	Char	HTML
123	7B	173	01111011	{	{
124	7C	174	01111100	\|	\|
125	7D	175	01111101	}	}
126	7E	176	01111110	~	~

Control codes

Dec	Hex	Oct	Binary	Char	HTML	Copy
127	7F	177	01111111	DEL	delete

A static table · nothing is uploaded

Static reference · 128 codes

All 128 ASCII codes with their decimal, hexadecimal, octal and binary values, the printable character and its HTML entity. The 33 control codes are named rather than printed, since most of them have no glyph. Search by number, character or name.

How to use the ASCII table

1 Type what you know; 65, 41, A, or "line feed".

2 Read across for the other three bases.

3 Copy the character with the button at the end of the row.

ASCII fixes 128 codes, which is 7 bits, and that number is the reason for a great deal of later trouble. The eighth bit was free, so every country filled it differently: code 233 was é in one encoding and Ω in another, and a file gave no way to tell which. UTF-8 resolved that by keeping codes 0–127 exactly as ASCII and using the high bit to start a multi-byte sequence, which is why ASCII text is valid UTF-8 unchanged and why this table still matters.

The layout is not arbitrary. Uppercase A is 65 and lowercase a is 97. A difference of exactly 32, one bit, so changing case is a single bitwise operation, which is how it was done for decades. The digits start at 48, so subtracting 48 from a digit character gives its value. And the control codes at the bottom are terminal instructions rather than characters: 7 rings a bell, 8 backspaces, 27 begins the escape sequences that still colour your terminal output today.

Two of them cause more confusion than the rest. Code 10 is line feed and code 13 is carriage return, and the split is mechanical: a teletype needed one instruction to advance the paper and another to return the carriage. Unix kept only the line feed, Windows kept both, and that is the whole of the CRLF problem.

Questions

Why does ASCII stop at 127? −

It defines 7 bits. The eighth bit was left free, and every region filled it differently, which is exactly the mess UTF-8 was designed to end.

What is the difference between LF and CR? +

Why is A 65 and a 97? +

Is extended ASCII in this table? +

Is ASCII still relevant with Unicode? +

Sources

RFC 20: ASCII format for network interchange Unicode Standard — the ASCII range

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