Tools / ASCII Table

ASCII Table

Look up any ASCII value by typing a character, decimal number, hex code (0x41), or binary value (0b1000001). Click any row to see all representations at once. Filter by category to narrow down the table.

Quick lookup

Dec	Hex	Oct	Bin	Char	Name
0	00	000	00000000		NUL
1	01	001	00000001		SOH
2	02	002	00000010		STX
3	03	003	00000011		ETX
4	04	004	00000100		EOT
5	05	005	00000101		ENQ
6	06	006	00000110		ACK
7	07	007	00000111		BEL
8	08	010	00001000		BS
9	09	011	00001001		TAB
10	0A	012	00001010		LF
11	0B	013	00001011		VT
12	0C	014	00001100		FF
13	0D	015	00001101		CR
14	0E	016	00001110		SO
15	0F	017	00001111		SI
16	10	020	00010000		DLE
17	11	021	00010001		DC1
18	12	022	00010010		DC2
19	13	023	00010011		DC3
20	14	024	00010100		DC4
21	15	025	00010101		NAK
22	16	026	00010110		SYN
23	17	027	00010111		ETB
24	18	030	00011000		CAN
25	19	031	00011001		EM
26	1A	032	00011010		SUB
27	1B	033	00011011		ESC
28	1C	034	00011100		FS
29	1D	035	00011101		GS
30	1E	036	00011110		RS
31	1F	037	00011111		US
32	20	040	00100000		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	/	/
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
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	@	@
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
91	5B	133	01011011	[	[
92	5C	134	01011100	\	\
93	5D	135	01011101	]	]
94	5E	136	01011110	^	^
95	5F	137	01011111	_	_
96	60	140	01100000	`	`
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
123	7B	173	01111011	{	{
124	7C	174	01111100	\|	\|
125	7D	175	01111101	}	}
126	7E	176	01111110	~	~
127	7F	177	01111111		DEL

How it works

ASCII (American Standard Code for Information Interchange) maps 128 characters to the integers 0 through 127. The first 32 codes (0-31) plus 127 are control characters like NUL, TAB, LF (line feed), and CR (carriage return). Codes 32-126 are printable: digits, uppercase and lowercase letters, punctuation, and space.

In CTF challenges, you will constantly convert between decimal, hex, and characters. A common pattern is a challenge that gives you a list of decimal or hex values that decode to the flag. For example, the sequence 112 105 99 111 67 84 70 decodes to picoCTF. This tool lets you look up each value instantly.

Key ranges to memorize: uppercase letters are 65-90 (0x41-0x5A), lowercase are 97-122 (0x61-0x7A), digits are 48-57 (0x30-0x39). The difference between uppercase and lowercase is always 32 (0x20), which is a single bit flip. This shows up in XOR-based challenges and case-manipulation puzzles.

Use this alongside the Number Base Converter for multi-base arithmetic, the XOR Cipher for byte-level XOR operations, or the Endianness Converter when reading multi-byte values from memory dumps.