Encoding

ASCII Table

Complete ASCII character table with decimal, hexadecimal, octal, and binary values. Includes control characters, printable characters, and extended descriptions.

Quick Reference

The complete ASCII (American Standard Code for Information Interchange) character set. ASCII uses 7 bits to represent 128 characters (0-127).

Control Characters (0-31, 127)

Dec	Hex	Oct	Char	Name	Description
0	00	000	NUL	Null	Null character
1	01	001	SOH	Start of Heading	Start of header
2	02	002	STX	Start of Text	Start of text
3	03	003	ETX	End of Text	End of text
4	04	004	EOT	End of Transmission	End of transmission
5	05	005	ENQ	Enquiry	Enquiry
6	06	006	ACK	Acknowledge	Acknowledge
7	07	007	BEL	Bell	Bell/alert
8	08	010	BS	Backspace	Backspace
9	09	011	HT	Horizontal Tab	Tab character
10	0A	012	LF	Line Feed	Newline
11	0B	013	VT	Vertical Tab	Vertical tab
12	0C	014	FF	Form Feed	Form feed/page break
13	0D	015	CR	Carriage Return	Carriage return
14	0E	016	SO	Shift Out	Shift out
15	0F	017	SI	Shift In	Shift in
16	10	020	DLE	Data Link Escape	Data link escape
17	11	021	DC1	Device Control 1	XON
18	12	022	DC2	Device Control 2
19	13	023	DC3	Device Control 3	XOFF
20	14	024	DC4	Device Control 4
21	15	025	NAK	Negative Acknowledge
22	16	026	SYN	Synchronous Idle
23	17	027	ETB	End of Trans. Block
24	18	030	CAN	Cancel
25	19	031	EM	End of Medium
26	1A	032	SUB	Substitute
27	1B	033	ESC	Escape	Escape character
28	1C	034	FS	File Separator
29	1D	035	GS	Group Separator
30	1E	036	RS	Record Separator
31	1F	037	US	Unit Separator
127	7F	177	DEL	Delete	Delete character

Printable Characters (32-126)

Space and Punctuation (32-47)

Dec	Hex	Char	Name
32	20	(space)	Space
33	21	!	Exclamation mark
34	22	"	Quotation mark
35	23	#	Number sign / Hash
36	24	$	Dollar sign
37	25	%	Percent sign
38	26	&	Ampersand
39	27	'	Apostrophe
40	28	(	Left parenthesis
41	29	)	Right parenthesis
42	2A	*	Asterisk
43	2B	+	Plus sign
44	2C	,	Comma
45	2D	-	Hyphen-minus
46	2E	.	Period / Full stop
47	2F	/	Slash / Solidus

Digits (48-57)

Dec	Hex	Char
48	30	0
49	31	1
50	32	2
51	33	3
52	34	4
53	35	5
54	36	6
55	37	7
56	38	8
57	39	9

More Punctuation (58-64)

Dec	Hex	Char	Name
58	3A	:	Colon
59	3B	;	Semicolon
60	3C	<	Less-than sign
61	3D	=	Equals sign
62	3E	>	Greater-than sign
63	3F	?	Question mark
64	40	@	At sign

Uppercase Letters (65-90)

Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
65	41	A	74	4A	J	83	53	S
66	42	B	75	4B	K	84	54	T
67	43	C	76	4C	L	85	55	U
68	44	D	77	4D	M	86	56	V
69	45	E	78	4E	N	87	57	W
70	46	F	79	4F	O	88	58	X
71	47	G	80	50	P	89	59	Y
72	48	H	81	51	Q	90	5A	Z
73	49	I	82	52	R

Brackets and Symbols (91-96)

Dec	Hex	Char	Name
91	5B	[	Left square bracket
92	5C	\	Backslash
93	5D	]	Right square bracket
94	5E	^	Caret / Circumflex
95	5F	_	Underscore
96	60	`	Grave accent / Backtick

Lowercase Letters (97-122)

Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
97	61	a	106	6A	j	115	73	s
98	62	b	107	6B	k	116	74	t
99	63	c	108	6C	l	117	75	u
100	64	d	109	6D	m	118	76	v
101	65	e	110	6E	n	119	77	w
102	66	f	111	6F	o	120	78	x
103	67	g	112	70	p	121	79	y
104	68	h	113	71	q	122	7A	z
105	69	i	114	72	r

Remaining Symbols (123-126)

Dec	Hex	Char	Name
123	7B	{	Left curly bracket
124	7C	\|	Vertical bar / Pipe
125	7D	}	Right curly bracket
126	7E	~	Tilde

Quick Reference

Common Codes to Remember

Character	Decimal	Hex	Notes
Space	32	20	First printable character
0-9	48-57	30-39	Subtract 48 to get numeric value
A-Z	65-90	41-5A	Add 32 to get lowercase
a-z	97-122	61-7A	Subtract 32 to get uppercase
Newline (LF)	10	0A	Unix line ending
Carriage Return (CR)	13	0D	Windows uses CR+LF
Tab	9	09	Horizontal tab
Null	0	00	String terminator in C

Case Conversion

To convert uppercase to lowercase: add 32 (or set bit 5)

'A' (65) + 32 = 'a' (97)
0x41 | 0x20 = 0x61

To convert lowercase to uppercase: subtract 32 (or clear bit 5)

'a' (97) - 32 = 'A' (65)
0x61 & 0xDF = 0x41

Character Type Checks

Check	Range
Is digit?	48 ≤ c ≤ 57
Is uppercase?	65 ≤ c ≤ 90
Is lowercase?	97 ≤ c ≤ 122
Is letter?	(65 ≤ c ≤ 90) OR (97 ≤ c ≤ 122)
Is alphanumeric?	Is digit OR is letter
Is printable?	32 ≤ c ≤ 126
Is control?	c < 32 OR c = 127

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Encoding

Unicode Character Tables

Quick reference for Unicode characters including arrows, math symbols, currency, Greek letters, box drawing, and special characters with their code points.

Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
65	41	A	74	4A	J	83	53	S
66	42	B	75	4B	K	84	54	T
67	43	C	76	4C	L	85	55	U
68	44	D	77	4D	M	86	56	V
69	45	E	78	4E	N	87	57	W
70	46	F	79	4F	O	88	58	X
71	47	G	80	50	P	89	59	Y
72	48	H	81	51	Q	90	5A	Z
73	49	I	82	52	R

Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
97	61	a	106	6A	j	115	73	s
98	62	b	107	6B	k	116	74	t
99	63	c	108	6C	l	117	75	u
100	64	d	109	6D	m	118	76	v
101	65	e	110	6E	n	119	77	w
102	66	f	111	6F	o	120	78	x
103	67	g	112	70	p	121	79	y
104	68	h	113	71	q	122	7A	z
105	69	i	114	72	r

Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
65	41	A	74	4A	J	83	53	S
66	42	B	75	4B	K	84	54	T
67	43	C	76	4C	L	85	55	U
68	44	D	77	4D	M	86	56	V
69	45	E	78	4E	N	87	57	W
70	46	F	79	4F	O	88	58	X
71	47	G	80	50	P	89	59	Y
72	48	H	81	51	Q	90	5A	Z
73	49	I	82	52	R

Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
97	61	a	106	6A	j	115	73	s
98	62	b	107	6B	k	116	74	t
99	63	c	108	6C	l	117	75	u
100	64	d	109	6D	m	118	76	v
101	65	e	110	6E	n	119	77	w
102	66	f	111	6F	o	120	78	x
103	67	g	112	70	p	121	79	y
104	68	h	113	71	q	122	7A	z
105	69	i	114	72	r

ASCII Table

Control Characters (0-31, 127)

Printable Characters (32-126)

Space and Punctuation (32-47)

Digits (48-57)

More Punctuation (58-64)

Uppercase Letters (65-90)

Brackets and Symbols (91-96)

Lowercase Letters (97-122)

Remaining Symbols (123-126)

Quick Reference

Common Codes to Remember

Case Conversion

Character Type Checks

Related Topics

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Related References

More References

Unicode Character Tables

Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
65	41	A	74	4A	J	83	53	S
66	42	B	75	4B	K	84	54	T
67	43	C	76	4C	L	85	55	U
68	44	D	77	4D	M	86	56	V
69	45	E	78	4E	N	87	57	W
70	46	F	79	4F	O	88	58	X
71	47	G	80	50	P	89	59	Y
72	48	H	81	51	Q	90	5A	Z
73	49	I	82	52	R

Dec	Hex	Char	Dec	Hex	Char	Dec	Hex	Char
97	61	a	106	6A	j	115	73	s
98	62	b	107	6B	k	116	74	t
99	63	c	108	6C	l	117	75	u
100	64	d	109	6D	m	118	76	v
101	65	e	110	6E	n	119	77	w
102	66	f	111	6F	o	120	78	x
103	67	g	112	70	p	121	79	y
104	68	h	113	71	q	122	7A	z
105	69	i	114	72	r