Reference table

ASCII Table

Every ASCII character from 0 to 127 with its decimal, hex, octal, and binary value. Search by any column and click a character to copy it.

ASCII lookup128 of 128 shown

Search by decimal, hex, character, or name

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

Click a character to copy it. Control codes copy their abbreviation.

Reading the ASCII table

ASCII is the encoding that quietly underpins almost all plain text. Fixed in the 1960s by the American National Standards Institute, it assigns a number from 0 to 127 to each letter, digit, punctuation mark, and a set of control codes. Because it needs only seven bits, any ASCII text is trivially portable, and its printable range is reproduced exactly in Unicode, so an ASCII file is already valid UTF-8 without any conversion.

The layout is deliberate. Digits sit in a contiguous block from 48 to 57, so subtracting 48 from a digit character gives its numeric value. Capital letters run 65 to 90 and lower case 97 to 122, a gap of exactly 32, which is a single bit. That structure is why case folding and simple parsing were cheap on early hardware, and it still shapes how strings are compared today.

Practical uses

Convert a character to its code point when debugging encoding issues.
Read escape sequences that start at code 27 to understand terminal color output.
Spot invisible control characters, such as a stray carriage return, that break file parsing.
Map hex bytes in a dump back to readable characters.

Frequently asked questions

FAQ

What is the ASCII table?

ASCII, the American Standard Code for Information Interchange, maps the numbers 0 through 127 to characters. Codes 0 to 31 and 127 are control codes such as tab and carriage return, 32 is the space, 48 to 57 are the digits, 65 to 90 are capital letters, and 97 to 122 are lower case letters.

What is the ASCII value of A?

The capital letter A is decimal 65, hex 0x41, and binary 01000001. Lower case a is decimal 97, exactly 32 higher, which is why flipping bit 6 switches the case of a letter.

What is the difference between ASCII and Unicode?

ASCII defines only 128 code points and fits in seven bits. Unicode is a superset whose first 128 code points are identical to ASCII, so every ASCII file is already valid UTF-8. Unicode then extends far beyond that to cover the writing systems of the world.

What are control characters used for?

Control characters are non printing codes that once drove teleprinters and terminals. A few are still everywhere: 9 is horizontal tab, 10 is line feed (the Unix newline), 13 is carriage return, and 27 is escape, which begins the sequences that color terminal output.

Reading the ASCII table

Practical uses

Frequently asked questions

Related references