ASCII Table

Complete ASCII character reference table with decimal and hex values

Dec	Hex	Oct	Bin	Char	Description
0	00	000	0000000	NUL	NUL (Null)
1	01	001	0000001	SOH	SOH (Start of Heading)
2	02	002	0000010	STX	STX (Start of Text)
3	03	003	0000011	ETX	ETX (End of Text)
4	04	004	0000100	EOT	EOT (End of Transmission)
5	05	005	0000101	ENQ	ENQ (Enquiry)
6	06	006	0000110	ACK	ACK (Acknowledge)
7	07	007	0000111	BEL	BEL (Bell)
8	08	010	0001000	BS	BS (Backspace)
9	09	011	0001001	HT	HT (Horizontal Tab)
10	0A	012	0001010	LF	LF (Line Feed)
11	0B	013	0001011	VT	VT (Vertical Tab)
12	0C	014	0001100	FF	FF (Form Feed)
13	0D	015	0001101	CR	CR (Carriage Return)
14	0E	016	0001110	SO	SO (Shift Out)
15	0F	017	0001111	SI	SI (Shift In)
16	10	020	0010000	DLE	DLE (Data Link Escape)
17	11	021	0010001	DC1	DC1 (Device Control 1)
18	12	022	0010010	DC2	DC2 (Device Control 2)
19	13	023	0010011	DC3	DC3 (Device Control 3)
20	14	024	0010100	DC4	DC4 (Device Control 4)
21	15	025	0010101	NAK	NAK (Negative Acknowledge)
22	16	026	0010110	SYN	SYN (Synchronous Idle)
23	17	027	0010111	ETB	ETB (End of Trans. Block)
24	18	030	0011000	CAN	CAN (Cancel)
25	19	031	0011001	EM	EM (End of Medium)
26	1A	032	0011010	SUB	SUB (Substitute)
27	1B	033	0011011	ESC	ESC (Escape)
28	1C	034	0011100	FS	FS (File Separator)
29	1D	035	0011101	GS	GS (Group Separator)
30	1E	036	0011110	RS	RS (Record Separator)
31	1F	037	0011111	US	US (Unit Separator)
32	20	040	0100000	SP	SP (Space)
33	21	041	0100001	!	!
34	22	042	0100010	"	"
35	23	043	0100011	#	#
36	24	044	0100100	$	$
37	25	045	0100101	%	%
38	26	046	0100110	&	&
39	27	047	0100111	'	'
40	28	050	0101000	(	(
41	29	051	0101001	)	)
42	2A	052	0101010	*	*
43	2B	053	0101011	+	+
44	2C	054	0101100	,	,
45	2D	055	0101101	-	-
46	2E	056	0101110	.	.
47	2F	057	0101111	/	/
48	30	060	0110000	0	0
49	31	061	0110001	1	1
50	32	062	0110010	2	2
51	33	063	0110011	3	3
52	34	064	0110100	4	4
53	35	065	0110101	5	5
54	36	066	0110110	6	6
55	37	067	0110111	7	7
56	38	070	0111000	8	8
57	39	071	0111001	9	9
58	3A	072	0111010	:	:
59	3B	073	0111011	;	;
60	3C	074	0111100	<	<
61	3D	075	0111101	=	=
62	3E	076	0111110	>	>
63	3F	077	0111111	?	?
64	40	100	1000000	@	@
65	41	101	1000001	A	A
66	42	102	1000010	B	B
67	43	103	1000011	C	C
68	44	104	1000100	D	D
69	45	105	1000101	E	E
70	46	106	1000110	F	F
71	47	107	1000111	G	G
72	48	110	1001000	H	H
73	49	111	1001001	I	I
74	4A	112	1001010	J	J
75	4B	113	1001011	K	K
76	4C	114	1001100	L	L
77	4D	115	1001101	M	M
78	4E	116	1001110	N	N
79	4F	117	1001111	O	O
80	50	120	1010000	P	P
81	51	121	1010001	Q	Q
82	52	122	1010010	R	R
83	53	123	1010011	S	S
84	54	124	1010100	T	T
85	55	125	1010101	U	U
86	56	126	1010110	V	V
87	57	127	1010111	W	W
88	58	130	1011000	X	X
89	59	131	1011001	Y	Y
90	5A	132	1011010	Z	Z
91	5B	133	1011011	[	[
92	5C	134	1011100	\	\
93	5D	135	1011101	]	]
94	5E	136	1011110	^	^
95	5F	137	1011111	_	_
96	60	140	1100000	`	`
97	61	141	1100001	a	a
98	62	142	1100010	b	b
99	63	143	1100011	c	c
100	64	144	1100100	d	d
101	65	145	1100101	e	e
102	66	146	1100110	f	f
103	67	147	1100111	g	g
104	68	150	1101000	h	h
105	69	151	1101001	i	i
106	6A	152	1101010	j	j
107	6B	153	1101011	k	k
108	6C	154	1101100	l	l
109	6D	155	1101101	m	m
110	6E	156	1101110	n	n
111	6F	157	1101111	o	o
112	70	160	1110000	p	p
113	71	161	1110001	q	q
114	72	162	1110010	r	r
115	73	163	1110011	s	s
116	74	164	1110100	t	t
117	75	165	1110101	u	u
118	76	166	1110110	v	v
119	77	167	1110111	w	w
120	78	170	1111000	x	x
121	79	171	1111001	y	y
122	7A	172	1111010	z	z
123	7B	173	1111011	{	{
124	7C	174	1111100	\|	\|
125	7D	175	1111101	}	}
126	7E	176	1111110	~	~
127	7F	177	1111111	DEL	DEL (Delete)

Click any row to see detailed breakdown. Orange rows are control characters (non-printable).

How to Use This Tool

Enter your input

Type or paste the value you want to look up or convert into the input field.

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Use the reference

Browse the built-in reference table to find related values, codes, or descriptions.

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About This Tool

ASCII Table is a free, instant, browser-based tool that complete ascii character reference table with decimal and hex values. Web developer tools provide quick access to reference data and small utilities that come up constantly during development. HTTP status codes, Unix timestamps, chmod permission calculators, ASCII tables, and similar references are things every web developer looks up regularly. Having them in one place, instantly accessible in your browser, speeds up your workflow significantly.

This tool runs entirely in your browser with no server calls required. Results appear instantly and everything works offline once the page is loaded.

Bookmark this page for quick access during development sessions. Whether you're debugging a 403 vs 401 response, converting a timestamp from a database field, setting file permissions on a Linux server, or checking what ASCII character code 127 corresponds to, having a reliable, distraction-free reference tool cuts down the time you spend looking things up and lets you stay focused on the problem at hand.

ASCII Table provides an instant reference for all 128 ASCII character codes and their corresponding characters, decimal, hex, and binary representations. Developers use it constantly for character handling, protocol design, and debugging encoding issues.

Why Use This Tool?

Common pitfalls and gotchas

The mistakes that come up repeatedly when working with web developer tools tools — most of them invisible until they cause production failures or silent data corruption.

Treating reference data as immutable forever
HTTP status codes, MIME types, and CSS units evolve. New status codes (425 Too Early, 451 Unavailable for Legal Reasons) get added; new MIME types appear for new file formats. Reference data baked into client code at build time can drift from current standards over years. Pin to a versioned reference and update on a regular cadence.
Confusing user-agent strings with reliable device detection
User-agent strings are spoofable, parseable but not authoritative, and increasingly being frozen or randomized by browsers (Chrome's User-Agent Reduction). Don't make security decisions based on UA detection. For feature detection, use real feature checks (`if ('IntersectionObserver' in window)`) rather than UA strings.
Hardcoding timestamps in local time
Timestamps stored as local-time strings without timezone information are unrecoverable when the codebase moves servers, when users span timezones, or when daylight-saving transitions create ambiguity. Always store timestamps as Unix epoch seconds (UTC) or ISO-8601 with explicit timezone offset.

Frequently asked questions

Are these references kept up to date?

Yes — we update reference data when standards change. HTTP status codes, MIME types, CSS units, and similar references reflect current specifications. If you spot something outdated, please email support and we'll fix it.

Can I rely on these tools for production decisions?

These tools are reliable references for routine work — looking up status codes, parsing user agents, converting timestamps. For high-stakes decisions (security configurations, compliance claims), cross-reference with the underlying RFCs and W3C specifications, which are the authoritative sources.

Will these tools work offline?

Once the page is loaded, most tools work offline — they run entirely in your browser. You can use them on a flight or in any environment without internet access after the initial page load. Refreshing the page may require connectivity.

Why is my browser showing different viewport dimensions than expected?

Browsers apply zoom level, system DPI scaling, and developer tool overlays that affect reported dimensions. The tool reports what the JavaScript runtime sees — which is what your CSS media queries also see. If a discrepancy exists, check zoom (Ctrl+0 to reset) and any open dev tool panels.

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