ASCII Table & Character Lookup

Full ASCII reference table with character lookup and all encoding formats.

Search (char, code, or name)

Extended (128-255)

Character Converter

Dec	Hex	Bin	Oct	Char	Name
0	00	00000000	0		NUL
1	01	00000001	1		SOH
2	02	00000010	2		STX
3	03	00000011	3		ETX
4	04	00000100	4		EOT
5	05	00000101	5		ENQ
6	06	00000110	6		ACK
7	07	00000111	7		BEL
8	08	00001000	10		BS
9	09	00001001	11		TAB
10	0A	00001010	12		LF
11	0B	00001011	13		VT
12	0C	00001100	14		FF
13	0D	00001101	15		CR
14	0E	00001110	16		SO
15	0F	00001111	17		SI
16	10	00010000	20		DLE
17	11	00010001	21		DC1
18	12	00010010	22		DC2
19	13	00010011	23		DC3
20	14	00010100	24		DC4
21	15	00010101	25		NAK
22	16	00010110	26		SYN
23	17	00010111	27		ETB
24	18	00011000	30		CAN
25	19	00011001	31		EM
26	1A	00011010	32		SUB
27	1B	00011011	33		ESC
28	1C	00011100	34		FS
29	1D	00011101	35		GS
30	1E	00011110	36		RS
31	1F	00011111	37		US
32	20	00100000	40		Space
33	21	00100001	41	!	!
34	22	00100010	42	"	"
35	23	00100011	43	#	#
36	24	00100100	44	$	$
37	25	00100101	45	%	%
38	26	00100110	46	&	&
39	27	00100111	47	'	'
40	28	00101000	50	(	(
41	29	00101001	51	)	)
42	2A	00101010	52	*	*
43	2B	00101011	53	+	+
44	2C	00101100	54	,	,
45	2D	00101101	55	-	-
46	2E	00101110	56	.	.
47	2F	00101111	57	/	/
48	30	00110000	60	0	0
49	31	00110001	61	1	1
50	32	00110010	62	2	2
51	33	00110011	63	3	3
52	34	00110100	64	4	4
53	35	00110101	65	5	5
54	36	00110110	66	6	6
55	37	00110111	67	7	7
56	38	00111000	70	8	8
57	39	00111001	71	9	9
58	3A	00111010	72	:	:
59	3B	00111011	73	;	;
60	3C	00111100	74	<	<
61	3D	00111101	75	=	=
62	3E	00111110	76	>	>
63	3F	00111111	77	?	?
64	40	01000000	100	@	@
65	41	01000001	101	A	A
66	42	01000010	102	B	B
67	43	01000011	103	C	C
68	44	01000100	104	D	D
69	45	01000101	105	E	E
70	46	01000110	106	F	F
71	47	01000111	107	G	G
72	48	01001000	110	H	H
73	49	01001001	111	I	I
74	4A	01001010	112	J	J
75	4B	01001011	113	K	K
76	4C	01001100	114	L	L
77	4D	01001101	115	M	M
78	4E	01001110	116	N	N
79	4F	01001111	117	O	O
80	50	01010000	120	P	P
81	51	01010001	121	Q	Q
82	52	01010010	122	R	R
83	53	01010011	123	S	S
84	54	01010100	124	T	T
85	55	01010101	125	U	U
86	56	01010110	126	V	V
87	57	01010111	127	W	W
88	58	01011000	130	X	X
89	59	01011001	131	Y	Y
90	5A	01011010	132	Z	Z
91	5B	01011011	133	[	[
92	5C	01011100	134	\	\
93	5D	01011101	135	]	]
94	5E	01011110	136	^	^
95	5F	01011111	137	_	_
96	60	01100000	140	`	`
97	61	01100001	141	a	a
98	62	01100010	142	b	b
99	63	01100011	143	c	c
100	64	01100100	144	d	d
101	65	01100101	145	e	e
102	66	01100110	146	f	f
103	67	01100111	147	g	g
104	68	01101000	150	h	h
105	69	01101001	151	i	i
106	6A	01101010	152	j	j
107	6B	01101011	153	k	k
108	6C	01101100	154	l	l
109	6D	01101101	155	m	m
110	6E	01101110	156	n	n
111	6F	01101111	157	o	o
112	70	01110000	160	p	p
113	71	01110001	161	q	q
114	72	01110010	162	r	r
115	73	01110011	163	s	s
116	74	01110100	164	t	t
117	75	01110101	165	u	u
118	76	01110110	166	v	v
119	77	01110111	167	w	w
120	78	01111000	170	x	x
121	79	01111001	171	y	y
122	7A	01111010	172	z	z
123	7B	01111011	173	{	{
124	7C	01111100	174	\|	\|
125	7D	01111101	175	}	}
126	7E	01111110	176	~	~
127	7F	01111111	177		DEL

Showing 128 characters. Click any row to copy.

Understanding ASCII: The Foundation of Text Encoding

ASCII (American Standard Code for Information Interchange) is a character encoding standard published in 1963 by the American Standards Association. It maps 128 characters to the numbers 0–127, covering English letters (uppercase and lowercase), digits 0–9, punctuation marks, and control characters. ASCII was designed for teleprinter communication and became the foundation for virtually all modern character encoding systems.

The 128 ASCII characters are divided into two groups. Control characters (0–31 and 127) are non-printable characters that originally controlled hardware devices: NUL (null), BEL (ring bell), BS (backspace), TAB (horizontal tab), LF (line feed), CR (carriage return), and ESC (escape). Printable characters (32–126) include space, digits, uppercase letters, lowercase letters, and punctuation.

ASCII in Programming

Programmers work with ASCII codes frequently. In JavaScript, `String.fromCharCode(65)` returns "A", and `"A".charCodeAt(0)` returns 65. In Python, `ord('A')` returns 65 and `chr(65)` returns 'A'. Understanding ASCII codes is essential for string manipulation, sorting algorithms, and data validation.

From ASCII to Unicode

ASCII's 128-character limit was insufficient for non-English languages. Extended ASCII (128–255) added characters for European languages but varied by platform and region, creating compatibility nightmares. Unicode was created to solve this by assigning a unique code point to every character in every writing system. UTF-8, the dominant encoding on the web, is backward-compatible with ASCII — the first 128 UTF-8 characters are identical to ASCII.

ASCII Art

ASCII art uses printable characters to create visual images and designs. It originated in the era of text-only terminals and continues as a creative art form. ASCII art is used in code comments, email signatures, README files, and retro-style games. The key to ASCII art is choosing characters with the right visual density: '@' and '#' appear dark, while '.' and ' ' appear light.

HTML Entities and URL Encoding

Special characters in HTML must be encoded as entities to avoid parsing conflicts. For example, '<' is `<`, '&' is `&`. URL encoding (percent-encoding) replaces unsafe characters with '%' followed by their hexadecimal ASCII code: space becomes '%20', '/' becomes '%2F'. Understanding ASCII codes is essential for working with these encoding systems.

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