ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns numbers 0-127 to characters. It was published in 1963 and became the foundation for modern text encoding. ASCII covers 95 printable characters (letters, digits, symbols, space) and 33 control characters (like newline, tab, escape). Extended ASCII (128-255) adds accented characters and symbols but is not standardized.

What are the ASCII values for A-Z and a-z?

Uppercase letters A-Z are ASCII 65-90 (hex 0x41-0x5A). Lowercase letters a-z are ASCII 97-122 (hex 0x61-0x7A). The difference between uppercase and lowercase is always 32. To convert uppercase to lowercase in code: char + 32. To convert lowercase to uppercase: char - 32. Example: A=65, a=97, B=66, b=98, Z=90, z=122.

What are ASCII control characters?

ASCII 0-31 and 127 are control characters — non-printable codes originally used to control hardware devices. Common ones: NUL (0) = null terminator, TAB (9) = horizontal tab, LF (10) = line feed (Unix newline), CR (13) = carriage return, ESC (27) = escape, DEL (127) = delete. Windows uses CR+LF (13+10) for newlines, Unix/Mac use LF (10) only.

What is the ASCII value of space?

Space is ASCII 32 (hex 0x20, binary 00100000). It is the first printable character in the ASCII table. Characters 0-31 are control characters, and 32 onwards are printable. Space is significant in programming: it separates tokens in many languages, is URL-encoded as %20 or +, and can be tricky in string comparisons.

What is the difference between ASCII and Unicode?

ASCII encodes 128 characters (English letters, digits, basic symbols). Unicode encodes over 149,000 characters covering all modern scripts, historical scripts, emoji, and symbols. ASCII is a subset of Unicode — the first 128 Unicode code points are identical to ASCII. UTF-8 is the most common Unicode encoding: ASCII characters use 1 byte, others use 2-4 bytes. All valid ASCII text is valid UTF-8.

How do I find the ASCII code of a character in programming?

JavaScript: "A".charCodeAt(0) returns 65. Python: ord("A") returns 65. C/C++: (int)'A' returns 65. Java: (int)'A' returns 65. To convert back: JavaScript: String.fromCharCode(65) returns "A". Python: chr(65) returns "A". C: (char)65 returns 'A'. These functions work for all ASCII values 0-127.

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ASCII Table & Reference

ASCII (American Standard Code for Information Interchange) assigns numbers 0-127 to characters. Printable characters are 32-126: space=32, 0-9=48-57, A-Z=65-90, a-z=97-122. Control characters 0-31 include NUL=0, TAB=9, LF=10 (newline), CR=13 (carriage return), ESC=27. DEL=127. To convert: A=65=0x41=01000001. Case conversion: lowercase = uppercase + 32 (a=97=A+32).

Complete ASCII table with all 128 characters. Search by character, decimal, hexadecimal, octal, or binary value. Interactive lookup for any ASCII code. Includes control characters (0-31), printable characters (32-126), and DEL (127). Filter by category: letters, digits, symbols, control characters.

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ASCII Table (128 characters)

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

Quick Reference — Common ASCII Values

Range	Characters	Decimal	Hex
Control chars	NUL, TAB, LF, CR...	0-31	0x00-0x1F
Space	(space)	32	0x20
Digits	0-9	48-57	0x30-0x39
Uppercase	A-Z	65-90	0x41-0x5A
Lowercase	a-z	97-122	0x61-0x7A
Common symbols	! @ # $ % & *	33-47, 58-64	0x21-0x2F
Brackets	[ ] { } ( )	40-41, 91-93, 123-125	various
DEL	(delete)	127	0x7F

How to Use

1
Browse the table
Scroll through the complete ASCII table showing all 128 characters with their decimal, hexadecimal, octal, and binary values.
2
Search for a character
Type a character, decimal number, or hex value in the search box to instantly find the matching ASCII entry.
3
Filter by category
Click filter buttons to show only control characters (0-31), printable characters (32-126), letters, digits, or symbols.
4
Copy a value
Click any row to copy the character details. Use the reference for encoding, programming, and character conversion tasks.

Frequently Asked Questions

What is ASCII?: ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns numbers 0-127 to characters. It was published in 1963 and became the foundation for modern text encoding. ASCII covers 95 printable characters (letters, digits, symbols, space) and 33 control characters (like newline, tab, escape). Extended ASCII (128-255) adds accented characters and symbols but is not standardized.
What are the ASCII values for A-Z and a-z?: Uppercase letters A-Z are ASCII 65-90 (hex 0x41-0x5A). Lowercase letters a-z are ASCII 97-122 (hex 0x61-0x7A). The difference between uppercase and lowercase is always 32. To convert uppercase to lowercase in code: char + 32. To convert lowercase to uppercase: char - 32. Example: A=65, a=97, B=66, b=98, Z=90, z=122.
What are ASCII control characters?: ASCII 0-31 and 127 are control characters — non-printable codes originally used to control hardware devices. Common ones: NUL (0) = null terminator, TAB (9) = horizontal tab, LF (10) = line feed (Unix newline), CR (13) = carriage return, ESC (27) = escape, DEL (127) = delete. Windows uses CR+LF (13+10) for newlines, Unix/Mac use LF (10) only.
What is the ASCII value of space?: Space is ASCII 32 (hex 0x20, binary 00100000). It is the first printable character in the ASCII table. Characters 0-31 are control characters, and 32 onwards are printable. Space is significant in programming: it separates tokens in many languages, is URL-encoded as %20 or +, and can be tricky in string comparisons.
What is the difference between ASCII and Unicode?: ASCII encodes 128 characters (English letters, digits, basic symbols). Unicode encodes over 149,000 characters covering all modern scripts, historical scripts, emoji, and symbols. ASCII is a subset of Unicode — the first 128 Unicode code points are identical to ASCII. UTF-8 is the most common Unicode encoding: ASCII characters use 1 byte, others use 2-4 bytes. All valid ASCII text is valid UTF-8.
How do I find the ASCII code of a character in programming?: JavaScript: "A".charCodeAt(0) returns 65. Python: ord("A") returns 65. C/C++: (int)'A' returns 65. Java: (int)'A' returns 65. To convert back: JavaScript: String.fromCharCode(65) returns "A". Python: chr(65) returns "A". C: (char)65 returns 'A'. These functions work for all ASCII values 0-127.