ASCII Table & Converter

Browse all 128 ASCII characters with their decimal, hex, binary, octal, and HTML entity codes — or convert any value instantly.

Dec	Hex	Oct	Binary	Char	HTML	Description
0	00	000	00000000	none		Control NUL (Null)
1	01	001	00000001	none		Control SOH (Start of Heading)
2	02	002	00000010	none		Control STX (Start of Text)
3	03	003	00000011	none		Control ETX (End of Text)
4	04	004	00000100	none		Control EOT (End of Transmission)
5	05	005	00000101	none		Control ENQ (Enquiry)
6	06	006	00000110	none		Control ACK (Acknowledge)
7	07	007	00000111	none		Control BEL (Bell)
8	08	010	00001000	none		Control BS (Backspace)
9	09	011	00001001	none		Control TAB (Horizontal Tab)
10	0A	012	00001010	none		Control LF (Line Feed)
11	0B	013	00001011	none		Control VT (Vertical Tab)
12	0C	014	00001100	none		Control FF (Form Feed)
13	0D	015	00001101	none		Control CR (Carriage Return)
14	0E	016	00001110	none		Control SO (Shift Out)
15	0F	017	00001111	none		Control SI (Shift In)
16	10	020	00010000	none		Control DLE (Data Link Escape)
17	11	021	00010001	none		Control DC1 (Device Control 1)
18	12	022	00010010	none		Control DC2 (Device Control 2)
19	13	023	00010011	none		Control DC3 (Device Control 3)
20	14	024	00010100	none		Control DC4 (Device Control 4)
21	15	025	00010101	none		Control NAK (Negative Acknowledge)
22	16	026	00010110	none		Control SYN (Synchronous Idle)
23	17	027	00010111	none		Control ETB (End of Transmission Block)
24	18	030	00011000	none		Control CAN (Cancel)
25	19	031	00011001	none		Control EM (End of Medium)
26	1A	032	00011010	none		Control SUB (Substitute)
27	1B	033	00011011	none		Control ESC (Escape)
28	1C	034	00011100	none		Control FS (File Separator)
29	1D	035	00011101	none		Control GS (Group Separator)
30	1E	036	00011110	none		Control RS (Record Separator)
31	1F	037	00011111	none		Control US (Unit Separator)
32	20	040	00100000			Printable
33	21	041	00100001	!	!	Printable
34	22	042	00100010	"	"	Printable
35	23	043	00100011	#	#	Printable
36	24	044	00100100	$	$	Printable
37	25	045	00100101	%	%	Printable
38	26	046	00100110	&	&	Printable
39	27	047	00100111	'	'	Printable
40	28	050	00101000	(	(	Printable
41	29	051	00101001	)	)	Printable
42	2A	052	00101010	*	*	Printable
43	2B	053	00101011	+	+	Printable
44	2C	054	00101100	,	,	Printable
45	2D	055	00101101	-	-	Printable
46	2E	056	00101110	.	.	Printable
47	2F	057	00101111	/	/	Printable
48	30	060	00110000	0	0	Printable
49	31	061	00110001	1	1	Printable
50	32	062	00110010	2	2	Printable
51	33	063	00110011	3	3	Printable
52	34	064	00110100	4	4	Printable
53	35	065	00110101	5	5	Printable
54	36	066	00110110	6	6	Printable
55	37	067	00110111	7	7	Printable
56	38	070	00111000	8	8	Printable
57	39	071	00111001	9	9	Printable
58	3A	072	00111010	:	:	Printable
59	3B	073	00111011	;	;	Printable
60	3C	074	00111100	<	<	Printable
61	3D	075	00111101	=	=	Printable
62	3E	076	00111110	>	>	Printable
63	3F	077	00111111	?	?	Printable
64	40	100	01000000	@	@	Printable
65	41	101	01000001	A	A	Printable
66	42	102	01000010	B	B	Printable
67	43	103	01000011	C	C	Printable
68	44	104	01000100	D	D	Printable
69	45	105	01000101	E	E	Printable
70	46	106	01000110	F	F	Printable
71	47	107	01000111	G	G	Printable
72	48	110	01001000	H	H	Printable
73	49	111	01001001	I	I	Printable
74	4A	112	01001010	J	J	Printable
75	4B	113	01001011	K	K	Printable
76	4C	114	01001100	L	L	Printable
77	4D	115	01001101	M	M	Printable
78	4E	116	01001110	N	N	Printable
79	4F	117	01001111	O	O	Printable
80	50	120	01010000	P	P	Printable
81	51	121	01010001	Q	Q	Printable
82	52	122	01010010	R	R	Printable
83	53	123	01010011	S	S	Printable
84	54	124	01010100	T	T	Printable
85	55	125	01010101	U	U	Printable
86	56	126	01010110	V	V	Printable
87	57	127	01010111	W	W	Printable
88	58	130	01011000	X	X	Printable
89	59	131	01011001	Y	Y	Printable
90	5A	132	01011010	Z	Z	Printable
91	5B	133	01011011	[	[	Printable
92	5C	134	01011100	\	\	Printable
93	5D	135	01011101	]	]	Printable
94	5E	136	01011110	^	^	Printable
95	5F	137	01011111	_	_	Printable
96	60	140	01100000	`	`	Printable
97	61	141	01100001	a	a	Printable
98	62	142	01100010	b	b	Printable
99	63	143	01100011	c	c	Printable
100	64	144	01100100	d	d	Printable
101	65	145	01100101	e	e	Printable
102	66	146	01100110	f	f	Printable
103	67	147	01100111	g	g	Printable
104	68	150	01101000	h	h	Printable
105	69	151	01101001	i	i	Printable
106	6A	152	01101010	j	j	Printable
107	6B	153	01101011	k	k	Printable
108	6C	154	01101100	l	l	Printable
109	6D	155	01101101	m	m	Printable
110	6E	156	01101110	n	n	Printable
111	6F	157	01101111	o	o	Printable
112	70	160	01110000	p	p	Printable
113	71	161	01110001	q	q	Printable
114	72	162	01110010	r	r	Printable
115	73	163	01110011	s	s	Printable
116	74	164	01110100	t	t	Printable
117	75	165	01110101	u	u	Printable
118	76	166	01110110	v	v	Printable
119	77	167	01110111	w	w	Printable
120	78	170	01111000	x	x	Printable
121	79	171	01111001	y	y	Printable
122	7A	172	01111010	z	z	Printable
123	7B	173	01111011	{	{	Printable
124	7C	174	01111100	\|	\|	Printable
125	7D	175	01111101	}	}	Printable
126	7E	176	01111110	~	~	Printable
127	7F	177	01111111	none		Control DEL (Delete)

Control characters (0–31 and 127) are highlighted and shown with their abbreviated names. Printable characters (32–126) can be copied with the copy button.

Private by design: All ASCII lookups and conversions run entirely in your browser. No data is sent to any server.

Full ASCII table

All 128 standard ASCII characters with decimal, hex, binary, octal, and HTML entity codes. Searchable and sortable.

Bidirectional converter

Enter a character, decimal, hex, octal, or binary value and see every other representation instantly.

Private by design

All lookups and conversions run locally in your browser. No data is ever sent to a server.

What is ASCII?

ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns numeric values to 128 characters. It was first published in 1963 and became the backbone of modern text encoding. The first 32 codes (0–31) are control characters used for device management — like carriage return, line feed, and tab. Codes 32–126 are printable characters including letters, digits, punctuation, and symbols. Code 127 is the DEL (delete) control character.

Because ASCII uses only 7 bits, it is universally supported and forms the common subset of virtually every modern encoding, including UTF-8. When you type plain English text, you are using ASCII. When a web page sends JSON data, the JSON specification itself is defined in terms of ASCII. Understanding ASCII is foundational to understanding how computers represent text.

How the ASCII converter works

The converter uses JavaScript's built-in charCodeAt and fromCharCode methods to translate between representations. When you enter a character, its Unicode code point is read (which equals the ASCII value for standard ASCII characters). When you enter a decimal, hex, octal, or binary number, parseInt converts it to a numeric value and fromCharCode maps it back to the corresponding character. All of this happens locally in your browser.

Common use cases for ASCII codes

Web developers reference ASCII when writing regex for whitespace (\t, \n, \r), handling CSV parsing, or sanitizing form input. Embedded systems engineers use ASCII for serial communication protocols where bytes are sent as human-readable text. Security researchers analyze network traffic and need to recognize control characters in hex dumps. Computer science students study ASCII when learning about character encoding, bitwise operations, and data representation. No matter your field, having a quick ASCII reference at hand saves time.

Frequently asked questions

›What is an ASCII table and why do I need one?

An ASCII table lists all 128 standard ASCII characters with their decimal, hexadecimal, octal, binary, and HTML entity codes. Developers use it constantly when writing parsers, debugging protocols, handling serial communication, or working with character encodings.

›What is the difference between ASCII and Unicode?

ASCII is a 7-bit character set with 128 characters (0–127), covering basic English letters, digits, punctuation, and control codes. Unicode is a much larger standard that supports over 149,000 characters across virtually every writing system in the world, including emoji. ASCII is a strict subset of Unicode.

›How do I convert a character to its ASCII decimal value?

Use the Converter tab, select 'Character' as the input type, and type any single character. The tool instantly shows the decimal, hex, octal, binary, and HTML entity representations.

›What are control characters in ASCII?

Control characters are the first 32 codes (0–31) plus DEL (127). They are non-printable and used for device control rather than display — for example, NUL (0), TAB (9), LF (10), CR (13), and ESC (27). In the table view they are highlighted and labeled with their abbreviated names.

›Why is ASCII 7-bit and not 8-bit?

The original ASCII standard was defined as 7-bit (128 characters) because that was sufficient for English text and telecommunications equipment of the 1960s used 7-bit channels. Extended ASCII variants (like ISO-8859-1 and Windows-1252) later used the 8th bit to add 128 more characters for other Western European languages.

›Does this tool show extended ASCII (128–255)?

This tool focuses on the standard 7-bit ASCII set (0–127) because it is the only universally agreed-upon subset. Extended ASCII (128–255) varies by code page and encoding (e.g., Latin-1 vs. Windows-1252), so a single table would be misleading.

›Is my input sent to a server?

No. All table rendering and conversions happen entirely in your browser. Your characters and search queries are never transmitted, logged, or stored on any server.

›What is the HTML entity column for?

The HTML entity column shows the numeric character reference (e.g., A for 'A'). These are useful when you need to embed special characters in HTML without ambiguity, especially when the raw character might be interpreted as markup.

›How do programmers use ASCII codes in practice?

Developers use ASCII codes when parsing text files, serializing data, writing regex for control characters, debugging network protocols, working with escape sequences in strings, and handling keyboard input events where key codes map to ASCII values.

Part of our growing tool belt — all client-side, all free.

See all tools