What is binary code in simple terms?

Binary code is a way of representing information using only two symbols: 0 and 1. Computers use it because their circuits have two states: on (1) and off (0). Everything you see on your screen — text, images, video — is stored and processed as long strings of 1s and 0s.

How many bits are in a byte?

A byte contains 8 bits. One byte can represent 256 different values (2^8 = 256), which is enough to encode all uppercase and lowercase English letters, numbers 0-9, punctuation, and control characters in the ASCII standard.

Can binary represent numbers other than 0 and 1?

Yes. Binary is a counting system just like decimal, but it uses base 2 instead of base 10. Any number can be written in binary. For example, the decimal number 42 is 101010 in binary. Computers perform all arithmetic using binary numbers, then convert the results back for display.

Green matrix binary code falling on screen, binary code tutorial for beginners

Binary Code for Beginners: Letters, Numbers & Symbols

If you have ever seen a string of 0s and 1s and wondered what it means, you are in the right place. Binary code is simpler than it looks. At its core, it is just a different way of writing the same numbers and letters you already know. In this guide, you will learn how binary represents text, numbers, and symbols, and how you can read it yourself.

What Is Binary Code, Really?

Binary means "two states." In computing, those two states are 0 and 1. A single 0 or 1 is called a bit (short for binary digit). String 8 bits together and you get a byte.

The reason computers use binary is physical. A transistor in a CPU is either conducting current (1) or not (0). There is no "kind of conducting." It is a clean on/off switch. Binary maps directly to how hardware works.

Key term: 8 bits = 1 byte. 1 byte = 1 character in standard text. Everything on your screen right now is stored as bytes of binary inside your computer's memory.

How Binary Represents Numbers

Counting in binary works exactly like counting in decimal. In decimal, you have ten symbols (0-9) and each position is a power of 10. In binary, you have two symbols (0-1) and each position is a power of 2.

Counting from 0 to 15 in Binary

Decimal	Binary (4-bit)	How to Read It
0	`0000`	Zero in any base
1	`0001`	1 in the 1s place
2	`0010`	1 in the 2s place
3	`0011`	2 + 1
4	`0100`	1 in the 4s place
5	`0101`	4 + 1
6	`0110`	4 + 2
7	`0111`	4 + 2 + 1
8	`1000`	1 in the 8s place
9	`1001`	8 + 1
10	`1010`	8 + 2
11	`1011`	8 + 2 + 1
12	`1100`	8 + 4
13	`1101`	8 + 4 + 1
14	`1110`	8 + 4 + 2
15	`1111`	8 + 4 + 2 + 1

Notice the pattern: after every four counts, the rightmost bit flips; after every two counts, the second bit flips. Binary counting has rhythm once you see it.

How Binary Represents Letters

Computers use a code called ASCII to map numbers to letters. The letter A is assigned the number 65, which in binary is 01000001. The letter B is 66 (01000010), and so on.

Letter	Decimal	Binary	Letter	Decimal	Binary
A	65	`01000001`	N	78	`01001110`
B	66	`01000010`	O	79	`01001111`
C	67	`01000011`	P	80	`01010000`
D	68	`01000100`	Q	81	`01010001`
E	69	`01000101`	R	82	`01010010`
F	70	`01000110`	S	83	`01010011`
G	71	`01000111`	T	84	`01010100`
H	72	`01001000`	U	85	`01010101`
I	73	`01001001`	V	86	`01010110`
J	74	`01001010`	W	87	`01010111`
K	75	`01001011`	X	88	`01011000`
L	76	`01001100`	Y	89	`01011001`
M	77	`01001101`	Z	90	`01011010`

Lowercase letters are the same but shifted by 32. Subtract 32 from the lowercase decimal to get the uppercase version, or flip the 6th bit (the 32s place) from 1 to 0.

How Binary Represents Symbols and Punctuation

ASCII reserves numbers 32-47, 58-64, 91-96, and 123-126 for symbols. Here are the most common ones:

Symbol	Decimal	Binary	Symbol	Decimal	Binary
Space	32	`00100000`	.	46	`00101110`
!	33	`00100001`	/	47	`00101111`
"	34	`00100010`	:	58	`00111010`
#	35	`00100011`	;	59	`00111011`
$	36	`00100100`	@	64	`01000000`
%	37	`00100101`	[	91	`01011011`
&	38	`00100110`	]	93	`01011101`
,	44	`00101100`	~	126	`01111110`
-	45	`00101101`	?	63	`00111111`

Can you read this binary message?
01001000 01100101 01101100 01101100 01101111 00100001

Split into 6 groups of 8:
01001000 = 72 = H
01100101 = 101 = e
01101100 = 108 = l
01101100 = 108 = l
01101111 = 111 = o
00100001 = 33 = !
Answer: "Hello!"

What About Emojis and Non-English Characters?

ASCII only covers 128 characters, which works for English but not for Chinese, Arabic, or emoji. UTF-8 solved this by using multiple bytes per character. An emoji like 😊 uses 4 bytes (32 bits): 11110000 10011111 10011000 10001010. That is why you need a binary translator that handles multi-byte sequences correctly.

When pasting binary into an online translator, the tool detects whether the input is 8-bit ASCII or variable-length UTF-8 and handles the decoding accordingly. Our BinTranslate tool supports both.

Practice: Translate These Binary Messages

Try these by hand before using the translator:

01000010 01101001 01101110 01100001 01110010 01111001
01000011 01101111 01100100 01100101
00110001 00110010 00110011

Answers (highlight to see):
1. Binary
2. Code
3. 123