ASCII to Binary Table

All 128 ASCII codes with their decimal number, hex value and 8-bit binary byte. Use the search box to find one character.

Sources last checked October 12, 2026

What this table shows

ASCII is a 7-bit code, so it has 128 positions, numbered 0 to 127. The first 32 codes and the last one are control codes that do not print. The rest are the space, the digits, the letters and the symbols you can type.[1][2]

Each row gives the character, its decimal code, the same code in hex, and the code as an 8-bit byte. ASCII is sent in 8-bit bytes with the top bit set to 0, which is why every binary value in the table starts with 0.[3]

ASCII codes 0 to 127

Find a row128 rows

ASCII codes 0 to 127 with decimal, hex and binary[4]
Char	Dec	Hex	Binary	Description
NUL	0	00	00000000	Null
SOH	1	01	00000001	Start of Heading
STX	2	02	00000010	Start of Text
ETX	3	03	00000011	End of Text
EOT	4	04	00000100	End of Transmission
ENQ	5	05	00000101	Enquiry
ACK	6	06	00000110	Acknowledge
BEL	7	07	00000111	Bell
BS	8	08	00001000	Backspace
HT	9	09	00001001	Horizontal Tabulation
LF	10	0A	00001010	Line Feed
VT	11	0B	00001011	Vertical Tabulation
FF	12	0C	00001100	Form Feed
CR	13	0D	00001101	Carriage Return
SO	14	0E	00001110	Shift Out
SI	15	0F	00001111	Shift In
DLE	16	10	00010000	Data Link Escape
DC1	17	11	00010001	Device Control 1
DC2	18	12	00010010	Device Control 2
DC3	19	13	00010011	Device Control 3
DC4	20	14	00010100	Device Control 4
NAK	21	15	00010101	Negative Acknowledge
SYN	22	16	00010110	Synchronous Idle
ETB	23	17	00010111	End of Transmission Block
CAN	24	18	00011000	Cancel
EM	25	19	00011001	End of Medium
SUB	26	1A	00011010	Substitute
ESC	27	1B	00011011	Escape
FS	28	1C	00011100	File Separator
GS	29	1D	00011101	Group Separator
RS	30	1E	00011110	Record Separator
US	31	1F	00011111	Unit Separator
SP	32	20	00100000	Space
!	33	21	00100001	Symbol
"	34	22	00100010	Symbol
#	35	23	00100011	Symbol
$	36	24	00100100	Symbol
%	37	25	00100101	Symbol
&	38	26	00100110	Symbol
'	39	27	00100111	Symbol
(	40	28	00101000	Symbol
)	41	29	00101001	Symbol
*	42	2A	00101010	Symbol
+	43	2B	00101011	Symbol
,	44	2C	00101100	Symbol
-	45	2D	00101101	Symbol
.	46	2E	00101110	Symbol
/	47	2F	00101111	Symbol
0	48	30	00110000	Digit 0
1	49	31	00110001	Digit 1
2	50	32	00110010	Digit 2
3	51	33	00110011	Digit 3
4	52	34	00110100	Digit 4
5	53	35	00110101	Digit 5
6	54	36	00110110	Digit 6
7	55	37	00110111	Digit 7
8	56	38	00111000	Digit 8
9	57	39	00111001	Digit 9
:	58	3A	00111010	Symbol
;	59	3B	00111011	Symbol
<	60	3C	00111100	Symbol
=	61	3D	00111101	Symbol
>	62	3E	00111110	Symbol
?	63	3F	00111111	Symbol
@	64	40	01000000	Symbol
A	65	41	01000001	Capital letter A
B	66	42	01000010	Capital letter B
C	67	43	01000011	Capital letter C
D	68	44	01000100	Capital letter D
E	69	45	01000101	Capital letter E
F	70	46	01000110	Capital letter F
G	71	47	01000111	Capital letter G
H	72	48	01001000	Capital letter H
I	73	49	01001001	Capital letter I
J	74	4A	01001010	Capital letter J
K	75	4B	01001011	Capital letter K
L	76	4C	01001100	Capital letter L
M	77	4D	01001101	Capital letter M
N	78	4E	01001110	Capital letter N
O	79	4F	01001111	Capital letter O
P	80	50	01010000	Capital letter P
Q	81	51	01010001	Capital letter Q
R	82	52	01010010	Capital letter R
S	83	53	01010011	Capital letter S
T	84	54	01010100	Capital letter T
U	85	55	01010101	Capital letter U
V	86	56	01010110	Capital letter V
W	87	57	01010111	Capital letter W
X	88	58	01011000	Capital letter X
Y	89	59	01011001	Capital letter Y
Z	90	5A	01011010	Capital letter Z
[	91	5B	01011011	Symbol
\	92	5C	01011100	Symbol
]	93	5D	01011101	Symbol
^	94	5E	01011110	Symbol
_	95	5F	01011111	Symbol
`	96	60	01100000	Symbol
a	97	61	01100001	Small letter a
b	98	62	01100010	Small letter b
c	99	63	01100011	Small letter c
d	100	64	01100100	Small letter d
e	101	65	01100101	Small letter e
f	102	66	01100110	Small letter f
g	103	67	01100111	Small letter g
h	104	68	01101000	Small letter h
i	105	69	01101001	Small letter i
j	106	6A	01101010	Small letter j
k	107	6B	01101011	Small letter k
l	108	6C	01101100	Small letter l
m	109	6D	01101101	Small letter m
n	110	6E	01101110	Small letter n
o	111	6F	01101111	Small letter o
p	112	70	01110000	Small letter p
q	113	71	01110001	Small letter q
r	114	72	01110010	Small letter r
s	115	73	01110011	Small letter s
t	116	74	01110100	Small letter t
u	117	75	01110101	Small letter u
v	118	76	01110110	Small letter v
w	119	77	01110111	Small letter w
x	120	78	01111000	Small letter x
y	121	79	01111001	Small letter y
z	122	7A	01111010	Small letter z
{	123	7B	01111011	Symbol
\|	124	7C	01111100	Symbol
}	125	7D	01111101	Symbol
~	126	7E	01111110	Symbol
DEL	127	7F	01111111	Delete

How to read a row

Find the character in the first column, or type it into the search box.
Read across to the decimal code. Capital K is 75.
The binary column shows the same number in base 2. For K that is 01001011.
Drop the leading 0 and split the last seven bits the way RFC 20 does. The first three give the column of its code chart and the last four give the row.[5]

Worked row: capital K

Text to binary: K[6][5]

Character: K
Binary: 01001011

Char	Dec	Hex	Binary
K	75	4B	01001011

Without the leading 0, the seven bits are 1001011, the same bits RFC 20 prints for K.
The first three bits, 100, make 4: the column. The last four, 1011, make 11: the row. RFC 20 puts K at column 4, row 11.

Control codes

Codes 0 to 31 were made to control printers and data links rather than to show a symbol. Line Feed, code 10, moves to the next line, and Carriage Return, code 13, moves back to the start of the same line.[7][8]

Code 127, DEL, is listed with them because it does not print, although RFC 20 notes that in the strict sense it is not a control character.[9]

Sources, last checked October 12, 2026

Glossary of Unicode Terms (Unicode Consortium)
1. The American Standard Code for Information Interchange, a 7-bit coded character set for information interchange.
2. The set of 128 Unicode characters from U+0000 to U+007F, including control codes as well as graphic characters.
RFC 20: ASCII format for Network Interchange (IETF, 1969)
1. For concreteness, we suggest the use of standard 7-bit ASCII embedded in an 8 bit byte whose high order bit is always 0.
2. NUL (Null): The all-zeros character which may serve to accomplish time fill and media fill.
3. The decimal equivalent of the binary number formed by bits b7, b6, and b5, collectively, forms the column number, and the decimal equivalent of the binary number formed by bits b4, b3, b2, and b1, collectively, forms the row number.
4. EXAMPLE: The bit representation for the character "K," positioned in column 4, row 11, is
5. LF (Line Feed): A format effector which controls the movement of the printing position to the next printing line.
6. CR (Carriage Return): A format effector which controls the movement of the printing position to the first printing position on the same printing line.
7. In the strict sense, DEL is not a control character.