ASCII Table

ASCII (American Standard Code for Information Interchange) is a 7-bit character encoding standard defining 128 characters: 33 non-printable control codes (0–31 and 127) and 95 printable characters (32–126). Every ASCII character maps 1:1 to the same byte value in UTF-8, Latin-1, and Windows-1252, making ASCII the safe common ground across all major encodings.

The table below shows decimal, hexadecimal, octal, and binary representations for each codepoint. Click any character to see its full Unicode encoding reference.

Control codes (0–31) Printable (32–126) DEL (127)

Control Codes (0–31)

The first 32 ASCII characters are non-printable control codes inherited from teletype machines and early terminals. Most are obsolete in modern use, but a handful — NUL, HT, LF, CR, ESC, DEL — appear constantly in programming. In C-family languages, the common ones have dedicated escape sequences shown in the Escape column.

Dec	Hex	Oct	Bin	Abbr	Escape	Name
0	0000	0	0000000	NUL	\0	Null
1	0001	1	0000001	SOH		Start of Heading
2	0002	2	0000010	STX		Start of Text
3	0003	3	0000011	ETX		End of Text
4	0004	4	0000100	EOT		End of Transmission
5	0005	5	0000101	ENQ		Enquiry
6	0006	6	0000110	ACK		Acknowledge
7	0007	7	0000111	BEL	\a	Bell
8	0008	10	0001000	BS	\b	Backspace
9	0009	11	0001001	HT	\t	Horizontal Tab
10	000A	12	0001010	LF	\n	Line Feed
11	000B	13	0001011	VT	\v	Vertical Tab
12	000C	14	0001100	FF	\f	Form Feed
13	000D	15	0001101	CR	\r	Carriage Return
14	000E	16	0001110	SO		Shift Out
15	000F	17	0001111	SI		Shift In
16	0010	20	0010000	DLE		Data Link Escape
17	0011	21	0010001	DC1		Device Control 1 (XON)
18	0012	22	0010010	DC2		Device Control 2
19	0013	23	0010011	DC3		Device Control 3 (XOFF)
20	0014	24	0010100	DC4		Device Control 4
21	0015	25	0010101	NAK		Negative Acknowledge
22	0016	26	0010110	SYN		Synchronous Idle
23	0017	27	0010111	ETB		End of Transmission Block
24	0018	30	0011000	CAN		Cancel
25	0019	31	0011001	EM		End of Medium
26	001A	32	0011010	SUB		Substitute
27	001B	33	0011011	ESC	\e	Escape
28	001C	34	0011100	FS		File Separator
29	001D	35	0011101	GS		Group Separator
30	001E	36	0011110	RS		Record Separator
31	001F	37	0011111	US		Unit Separator

Printable Characters (32–126)

Codepoints 32–126 are printable. Code 32 is the space character. Codepoints 48–57 are the decimal digits 0–9. Uppercase letters run from 65–90, lowercase from 97–122 — exactly 32 apart, which is why toggling bit 5 swaps case in ASCII.

Char	Dec	Hex	Oct	Bin	HTML Entity	Unicode Name
	32	0020	40	0100000	—	SPACE
!	33	0021	41	0100001	—	EXCLAMATION MARK
"	34	0022	42	0100010	"	QUOTATION MARK
#	35	0023	43	0100011	—	NUMBER SIGN
$	36	0024	44	0100100	—	DOLLAR SIGN
%	37	0025	45	0100101	—	PERCENT SIGN
&	38	0026	46	0100110	&	AMPERSAND
'	39	0027	47	0100111	'	APOSTROPHE
(	40	0028	50	0101000	—	LEFT PARENTHESIS
)	41	0029	51	0101001	—	RIGHT PARENTHESIS
*	42	002A	52	0101010	—	ASTERISK
+	43	002B	53	0101011	—	PLUS SIGN
,	44	002C	54	0101100	—	COMMA
-	45	002D	55	0101101	—	HYPHEN-MINUS
.	46	002E	56	0101110	—	FULL STOP
/	47	002F	57	0101111	—	SOLIDUS
0	48	0030	60	0110000	—	DIGIT ZERO
1	49	0031	61	0110001	—	DIGIT ONE
2	50	0032	62	0110010	—	DIGIT TWO
3	51	0033	63	0110011	—	DIGIT THREE
4	52	0034	64	0110100	—	DIGIT FOUR
5	53	0035	65	0110101	—	DIGIT FIVE
6	54	0036	66	0110110	—	DIGIT SIX
7	55	0037	67	0110111	—	DIGIT SEVEN
8	56	0038	70	0111000	—	DIGIT EIGHT
9	57	0039	71	0111001	—	DIGIT NINE
:	58	003A	72	0111010	—	COLON
;	59	003B	73	0111011	—	SEMICOLON
<	60	003C	74	0111100	<	LESS-THAN SIGN
=	61	003D	75	0111101	—	EQUALS SIGN
>	62	003E	76	0111110	>	GREATER-THAN SIGN
?	63	003F	77	0111111	—	QUESTION MARK
@	64	0040	100	1000000	—	COMMERCIAL AT
A	65	0041	101	1000001	—	LATIN CAPITAL LETTER A
B	66	0042	102	1000010	—	LATIN CAPITAL LETTER B
C	67	0043	103	1000011	—	LATIN CAPITAL LETTER C
D	68	0044	104	1000100	—	LATIN CAPITAL LETTER D
E	69	0045	105	1000101	—	LATIN CAPITAL LETTER E
F	70	0046	106	1000110	—	LATIN CAPITAL LETTER F
G	71	0047	107	1000111	—	LATIN CAPITAL LETTER G
H	72	0048	110	1001000	—	LATIN CAPITAL LETTER H
I	73	0049	111	1001001	—	LATIN CAPITAL LETTER I
J	74	004A	112	1001010	—	LATIN CAPITAL LETTER J
K	75	004B	113	1001011	—	LATIN CAPITAL LETTER K
L	76	004C	114	1001100	—	LATIN CAPITAL LETTER L
M	77	004D	115	1001101	—	LATIN CAPITAL LETTER M
N	78	004E	116	1001110	—	LATIN CAPITAL LETTER N
O	79	004F	117	1001111	—	LATIN CAPITAL LETTER O
P	80	0050	120	1010000	—	LATIN CAPITAL LETTER P
Q	81	0051	121	1010001	—	LATIN CAPITAL LETTER Q
R	82	0052	122	1010010	—	LATIN CAPITAL LETTER R
S	83	0053	123	1010011	—	LATIN CAPITAL LETTER S
T	84	0054	124	1010100	—	LATIN CAPITAL LETTER T
U	85	0055	125	1010101	—	LATIN CAPITAL LETTER U
V	86	0056	126	1010110	—	LATIN CAPITAL LETTER V
W	87	0057	127	1010111	—	LATIN CAPITAL LETTER W
X	88	0058	130	1011000	—	LATIN CAPITAL LETTER X
Y	89	0059	131	1011001	—	LATIN CAPITAL LETTER Y
Z	90	005A	132	1011010	—	LATIN CAPITAL LETTER Z
[	91	005B	133	1011011	—	LEFT SQUARE BRACKET
\	92	005C	134	1011100	—	REVERSE SOLIDUS
]	93	005D	135	1011101	—	RIGHT SQUARE BRACKET
^	94	005E	136	1011110	—	CIRCUMFLEX ACCENT
_	95	005F	137	1011111	—	LOW LINE
`	96	0060	140	1100000	—	GRAVE ACCENT
a	97	0061	141	1100001	—	LATIN SMALL LETTER A
b	98	0062	142	1100010	—	LATIN SMALL LETTER B
c	99	0063	143	1100011	—	LATIN SMALL LETTER C
d	100	0064	144	1100100	—	LATIN SMALL LETTER D
e	101	0065	145	1100101	—	LATIN SMALL LETTER E
f	102	0066	146	1100110	—	LATIN SMALL LETTER F
g	103	0067	147	1100111	—	LATIN SMALL LETTER G
h	104	0068	150	1101000	—	LATIN SMALL LETTER H
i	105	0069	151	1101001	—	LATIN SMALL LETTER I
j	106	006A	152	1101010	—	LATIN SMALL LETTER J
k	107	006B	153	1101011	—	LATIN SMALL LETTER K
l	108	006C	154	1101100	—	LATIN SMALL LETTER L
m	109	006D	155	1101101	—	LATIN SMALL LETTER M
n	110	006E	156	1101110	—	LATIN SMALL LETTER N
o	111	006F	157	1101111	—	LATIN SMALL LETTER O
p	112	0070	160	1110000	—	LATIN SMALL LETTER P
q	113	0071	161	1110001	—	LATIN SMALL LETTER Q
r	114	0072	162	1110010	—	LATIN SMALL LETTER R
s	115	0073	163	1110011	—	LATIN SMALL LETTER S
t	116	0074	164	1110100	—	LATIN SMALL LETTER T
u	117	0075	165	1110101	—	LATIN SMALL LETTER U
v	118	0076	166	1110110	—	LATIN SMALL LETTER V
w	119	0077	167	1110111	—	LATIN SMALL LETTER W
x	120	0078	170	1111000	—	LATIN SMALL LETTER X
y	121	0079	171	1111001	—	LATIN SMALL LETTER Y
z	122	007A	172	1111010	—	LATIN SMALL LETTER Z
{	123	007B	173	1111011	—	LEFT CURLY BRACKET
\|	124	007C	174	1111100	—	VERTICAL LINE
}	125	007D	175	1111101	—	RIGHT CURLY BRACKET
~	126	007E	176	1111110	—	TILDE

DEL (127)

Codepoint 127 is the Delete character (DEL). Like the control codes, it is non-printable. It was historically used on paper tape to delete a character by punching all seven bits — all ones in binary (1111111). On modern systems it is rarely encountered directly but appears in some terminal emulators as the backspace key code.

Dec	Hex	Oct	Bin	Abbr	Name
127	7F	177	1111111	DEL	Delete

ASCII FAQ

Is ASCII the same as UTF-8?

For the 128 ASCII characters, yes — the byte values are identical. UTF-8 was deliberately designed to be ASCII-compatible: any ASCII file is a valid UTF-8 file. The difference is that UTF-8 extends beyond 127 using multi-byte sequences, while ASCII stops at 127.

Why do uppercase and lowercase letters differ by 32?

It was intentional. Uppercase A is 65 (1000001) and lowercase a is 97 (1100001). They differ only in bit 5 (0-indexed). This means you can toggle case by XORing with 32, or convert to lowercase by ORing with 32 — a trick that worked on early hardware without conditional logic.

What is the difference between LF and CRLF?

LF (Line Feed, code 10, \n) moves the cursor down one line. CR (Carriage Return, code 13, \r) moves it to the start of the line. Unix systems use LF alone for newlines. Windows uses CRLF (both, in sequence). Classic Mac OS used CR alone. This is the source of the "line ending" differences that break text files across operating systems.

Why does ASCII only go to 127?

ASCII uses 7 bits, which allows 2⁷ = 128 values (0–127). The eighth bit was reserved for parity checking in serial transmission. When extended encodings like Latin-1 needed more characters, they used the eighth bit to reach 256 values (0–255). This is why Latin-1 is a direct superset of ASCII.