ASCII Table — Complete Reference (Decimal, Hex, Binary, Octal)

Complete reference for all 128 standard ASCII characters with decimal, hexadecimal, binary, and octal codes. Use the text-to-ASCII tool to convert any string in real time.

Control characters (0–31)

Dec	Hex	Bin	Char	Name
0	00	0000 0000	NUL	Null
1	01	0000 0001	SOH	Start of Heading
2	02	0000 0010	STX	Start of Text
3	03	0000 0011	ETX	End of Text
4	04	0000 0100	EOT	End of Transmission
5	05	0000 0101	ENQ	Enquiry
6	06	0000 0110	ACK	Acknowledge
7	07	0000 0111	BEL	Bell (alert)
8	08	0000 1000	BS	Backspace
9	09	0000 1001	HT	Horizontal Tab (\t)
10	0A	0000 1010	LF	Line Feed (\n)
11	0B	0000 1011	VT	Vertical Tab
12	0C	0000 1100	FF	Form Feed
13	0D	0000 1101	CR	Carriage Return (\r)
14	0E	0000 1110	SO	Shift Out
15	0F	0000 1111	SI	Shift In
16	10	0001 0000	DLE	Data Link Escape
17	11	0001 0001	DC1	Device Control 1 (XON)
18	12	0001 0010	DC2	Device Control 2
19	13	0001 0011	DC3	Device Control 3 (XOFF)
20	14	0001 0100	DC4	Device Control 4
21	15	0001 0101	NAK	Negative Acknowledge
22	16	0001 0110	SYN	Synchronous Idle
23	17	0001 0111	ETB	End of Transmission Block
24	18	0001 1000	CAN	Cancel
25	19	0001 1001	EM	End of Medium
26	1A	0001 1010	SUB	Substitute
27	1B	0001 1011	ESC	Escape
28	1C	0001 1100	FS	File Separator
29	1D	0001 1101	GS	Group Separator
30	1E	0001 1110	RS	Record Separator
31	1F	0001 1111	US	Unit Separator

Printable characters (32–126)

Dec	Hex	Char	Name
32	20	(space)	Space
33	21	!	Exclamation
34	22	"	Double quote
35	23	#	Hash / pound
36	24	$	Dollar
37	25	%	Percent
38	26	&	Ampersand
39	27	'	Single quote
40	28	(	Left parenthesis
41	29	)	Right parenthesis
42	2A	*	Asterisk
43	2B	+	Plus
44	2C	,	Comma
45	2D	-	Hyphen / minus
46	2E	.	Period
47	2F	/	Forward slash
48–57	30–39	0–9	Digits
58	3A	:	Colon
59	3B	;	Semicolon
60	3C	<	Less than
61	3D	=	Equals
62	3E	>	Greater than
63	3F	?	Question mark
64	40	@	At sign
65–90	41–5A	A–Z	Uppercase letters
91	5B	[	Left bracket
92	5C	\	Backslash
93	5D	]	Right bracket
94	5E	^	Caret
95	5F	_	Underscore
96	60	`	Backtick
97–122	61–7A	a–z	Lowercase letters
123	7B	{	Left brace
124	7C	|	Pipe / vertical bar
125	7D	}	Right brace
126	7E	~	Tilde
127	7F	DEL	Delete

Quick rules

• Letter case math: uppercase + 32 = lowercase. 'A' (65) + 32 = 'a' (97).
• Digits start at 48: '0' is decimal 48, '9' is 57. To get the integer value, subtract 48.
• Highest standard ASCII: 127 (DEL). Anything above is "extended ASCII" — non-standard; use UTF-8 instead.
• UTF-8 compatibility: all 128 ASCII characters encode to identical UTF-8 bytes. Any ASCII file is also valid UTF-8.

Related tools

Convert a string to ASCII codes: text to ASCII. To binary: text to binary. To hex: text to hex. Reverse — binary back to text: binary to text.