Binary Translator

Translate text to binary and back (UTF-8, 8-bit groups), plus decimal, hex, and octal converters — all in your browser.

Paste text and get its UTF-8 binary — "Hi" becomes 01001000 01101001 — or paste binary and get the text back. Three more converters sit alongside for binary ↔ decimal, hex, and octal.Every character becomes 8 bits (more for emoji and CJK, which use multiple UTF-8 bytes), so a tweet-sized message runs to a few thousand bits. The number converters use BigInt, so binary values past 9 quadrillion convert exactly.

Binary code

Text

Binary ↔ Decimal

Binary ↔ Hexadecimal

Binary ↔ Octal

Printable ASCII reference

32	20	00100000
33	21	00100001	!
34	22	00100010	"
35	23	00100011	#
36	24	00100100	$
37	25	00100101	%
38	26	00100110	&
39	27	00100111	'
40	28	00101000	(
41	29	00101001	)
42	2A	00101010	*
43	2B	00101011	+
44	2C	00101100	,
45	2D	00101101	-
46	2E	00101110	.
47	2F	00101111	/
48	30	00110000	0
49	31	00110001	1
50	32	00110010	2
51	33	00110011	3
52	34	00110100	4
53	35	00110101	5
54	36	00110110	6
55	37	00110111	7
56	38	00111000	8
57	39	00111001	9
58	3A	00111010	:
59	3B	00111011	;
60	3C	00111100	<
61	3D	00111101	=
62	3E	00111110	>
63	3F	00111111	?
64	40	01000000	@
65	41	01000001	A
66	42	01000010	B
67	43	01000011	C
68	44	01000100	D
69	45	01000101	E
70	46	01000110	F
71	47	01000111	G
72	48	01001000	H
73	49	01001001	I
74	4A	01001010	J
75	4B	01001011	K
76	4C	01001100	L
77	4D	01001101	M
78	4E	01001110	N
79	4F	01001111	O
80	50	01010000	P
81	51	01010001	Q
82	52	01010010	R
83	53	01010011	S
84	54	01010100	T
85	55	01010101	U
86	56	01010110	V
87	57	01010111	W
88	58	01011000	X
89	59	01011001	Y
90	5A	01011010	Z
91	5B	01011011	[
92	5C	01011100	\
93	5D	01011101	]
94	5E	01011110	^
95	5F	01011111	_
96	60	01100000	`
97	61	01100001	a
98	62	01100010	b
99	63	01100011	c
100	64	01100100	d
101	65	01100101	e
102	66	01100110	f
103	67	01100111	g
104	68	01101000	h
105	69	01101001	i
106	6A	01101010	j
107	6B	01101011	k
108	6C	01101100	l
109	6D	01101101	m
110	6E	01101110	n
111	6F	01101111	o
112	70	01110000	p
113	71	01110001	q
114	72	01110010	r
115	73	01110011	s
116	74	01110100	t
117	75	01110101	u
118	76	01110110	v
119	77	01110111	w
120	78	01111000	x
121	79	01111001	y
122	7A	01111010	z
123	7B	01111011	{
124	7C	01111100	\|
125	7D	01111101	}
126	7E	01111110	~

Written by Nan Liang · Updated November 2026

Frequently asked questions

Is this binary ASCII or UTF-8?

UTF-8, which extends ASCII: English letters, digits, and standard punctuation give the same 8-bit groups ASCII would, while accented characters, CJK, and emoji encode as multiple bytes.

Why does my binary decode to garbage?

Three common causes: the bit string is not a multiple of 8 (check for missing digits), it was encoded in a legacy code page like Windows-1252, or it is actually hexadecimal digits mislabeled as binary.

How do I read the ASCII column?

The printable ASCII table (32–126) is shown below the converters for reference: 01001000 is 72, which is H. Codes below 32 are control characters like tab (9) and newline (10).

Can I convert binary to a decimal number larger than a calculator shows?

Yes. The binary ↔ decimal converter uses BigInt arithmetic, so a 100-bit binary number converts to its exact 30-digit decimal value with no rounding.

Next steps

Working with byte values in hex instead? The Hex Translator does the same round trips in base 16.

Open the Hex Translator →