Binary Alphabet Chart (A to Z)

The binary alphabet uses ASCII codes: A to Z are 01000001 to 01011010, and a to z are 01100001 to 01111010. Each letter is one byte, and the lowercase code is the uppercase code plus 32.

By Matt Dean · Last updated November 8, 2026 · How we test our converters

Find any letter in binary below. Copy the codes to write your name or a message by hand, or type it into the text to binary converter to do it instantly.

Letters A to Z in binary

Upper	Binary	Lower	Binary
A	01000001	a	01100001
B	01000010	b	01100010
C	01000011	c	01100011
D	01000100	d	01100100
E	01000101	e	01100101
F	01000110	f	01100110
G	01000111	g	01100111
H	01001000	h	01101000
I	01001001	i	01101001
J	01001010	j	01101010
K	01001011	k	01101011
L	01001100	l	01101100
M	01001101	m	01101101
N	01001110	n	01101110
O	01001111	o	01101111
P	01010000	p	01110000
Q	01010001	q	01110001
R	01010010	r	01110010
S	01010011	s	01110011
T	01010100	t	01110100
U	01010101	u	01110101
V	01010110	v	01110110
W	01010111	w	01110111
X	01011000	x	01111000
Y	01011001	y	01111001
Z	01011010	z	01111010

Digits 0 to 9 in binary text

When a digit is typed as a character, it uses its ASCII code, not its value. This is different from the number 5 written as 101.

Character	8-bit code
0	00110000
1	00110001
2	00110010
3	00110011
4	00110100
5	00110101
6	00110110
7	00110111
8	00111000
9	00111001

Spell your name in binary

1. Look up each letter above.
2. Write the 8-bit codes in order, separated by spaces.
3. Check the result with the binary to text converter.

Example: Sam is 01010011 01100001 01101101.

Binary alphabet FAQ

Why do capital and small letters have different codes?

They are different characters. The codes differ by 32, which flips one bit (the third from the left).

Is there a binary alphabet shorter than 8 bits?

Classic 5-bit Baudot code and 7-bit ASCII exist, but modern computers use 8-bit bytes.

How do I write a space?

A space is 00100000.

What about punctuation?

See the full ASCII binary table.