What is the difference between ASCII and Unicode?

ASCII defines 128 characters (7-bit). Unicode is a superset that defines over 140,000 characters covering virtually all writing systems. UTF-8 encoding is backward compatible with ASCII — the first 128 code points are identical.

What are ASCII control characters?

Control characters (0-31 and 127) are non-printable characters used for device control. Common ones include NUL (0), LF/Newline (10), CR/Enter (13), and ESC (27).

ASCII Table

Free online ASCII character table, searchable reference

128 entries

Dec	Hex	Oct	Bin	Char	Free online ASCII character table, searchable reference
0	0x00	000	00000000	NUL	Null
1	0x01	001	00000001	SOH	Start of Heading
2	0x02	002	00000010	STX	Start of Text
3	0x03	003	00000011	ETX	End of Text
4	0x04	004	00000100	EOT	End of Transmission
5	0x05	005	00000101	ENQ	Enquiry
6	0x06	006	00000110	ACK	Acknowledgement
7	0x07	007	00000111	BEL	Bell
8	0x08	010	00001000	BS	Backspace
9	0x09	011	00001001	HT	Horizontal Tab
10	0x0A	012	00001010	LF	Line Feed
11	0x0B	013	00001011	VT	Vertical Tab
12	0x0C	014	00001100	FF	Form Feed
13	0x0D	015	00001101	CR	Carriage Return
14	0x0E	016	00001110	SO	Shift Out
15	0x0F	017	00001111	SI	Shift In
16	0x10	020	00010000	DLE	Data Link Escape
17	0x11	021	00010001	DC1	Device Control 1
18	0x12	022	00010010	DC2	Device Control 2
19	0x13	023	00010011	DC3	Device Control 3
20	0x14	024	00010100	DC4	Device Control 4
21	0x15	025	00010101	NAK	Negative Ack.
22	0x16	026	00010110	SYN	Synchronous Idle
23	0x17	027	00010111	ETB	End of Trans. Block
24	0x18	030	00011000	CAN	Cancel
25	0x19	031	00011001	EM	End of Medium
26	0x1A	032	00011010	SUB	Substitute
27	0x1B	033	00011011	ESC	Escape
28	0x1C	034	00011100	FS	File Separator
29	0x1D	035	00011101	GS	Group Separator
30	0x1E	036	00011110	RS	Record Separator
31	0x1F	037	00011111	US	Unit Separator
32	0x20	040	00100000	␣	Space
33	0x21	041	00100001	!	!
34	0x22	042	00100010	"	"
35	0x23	043	00100011	#	#
36	0x24	044	00100100	$	$
37	0x25	045	00100101	%	%
38	0x26	046	00100110	&	&
39	0x27	047	00100111	'	'
40	0x28	050	00101000	(	(
41	0x29	051	00101001	)	)
42	0x2A	052	00101010	*	*
43	0x2B	053	00101011	+	+
44	0x2C	054	00101100	,	,
45	0x2D	055	00101101	-	-
46	0x2E	056	00101110	.	.
47	0x2F	057	00101111	/	/
48	0x30	060	00110000	0	0
49	0x31	061	00110001	1	1
50	0x32	062	00110010	2	2
51	0x33	063	00110011	3	3
52	0x34	064	00110100	4	4
53	0x35	065	00110101	5	5
54	0x36	066	00110110	6	6
55	0x37	067	00110111	7	7
56	0x38	070	00111000	8	8
57	0x39	071	00111001	9	9
58	0x3A	072	00111010	:	:
59	0x3B	073	00111011	;	;
60	0x3C	074	00111100	<	<
61	0x3D	075	00111101	=	=
62	0x3E	076	00111110	>	>
63	0x3F	077	00111111	?	?
64	0x40	100	01000000	@	@
65	0x41	101	01000001	A	A
66	0x42	102	01000010	B	B
67	0x43	103	01000011	C	C
68	0x44	104	01000100	D	D
69	0x45	105	01000101	E	E
70	0x46	106	01000110	F	F
71	0x47	107	01000111	G	G
72	0x48	110	01001000	H	H
73	0x49	111	01001001	I	I
74	0x4A	112	01001010	J	J
75	0x4B	113	01001011	K	K
76	0x4C	114	01001100	L	L
77	0x4D	115	01001101	M	M
78	0x4E	116	01001110	N	N
79	0x4F	117	01001111	O	O
80	0x50	120	01010000	P	P
81	0x51	121	01010001	Q	Q
82	0x52	122	01010010	R	R
83	0x53	123	01010011	S	S
84	0x54	124	01010100	T	T
85	0x55	125	01010101	U	U
86	0x56	126	01010110	V	V
87	0x57	127	01010111	W	W
88	0x58	130	01011000	X	X
89	0x59	131	01011001	Y	Y
90	0x5A	132	01011010	Z	Z
91	0x5B	133	01011011	[	[
92	0x5C	134	01011100	\	\
93	0x5D	135	01011101	]	]
94	0x5E	136	01011110	^	^
95	0x5F	137	01011111	_	_
96	0x60	140	01100000	`	`
97	0x61	141	01100001	a	a
98	0x62	142	01100010	b	b
99	0x63	143	01100011	c	c
100	0x64	144	01100100	d	d
101	0x65	145	01100101	e	e
102	0x66	146	01100110	f	f
103	0x67	147	01100111	g	g
104	0x68	150	01101000	h	h
105	0x69	151	01101001	i	i
106	0x6A	152	01101010	j	j
107	0x6B	153	01101011	k	k
108	0x6C	154	01101100	l	l
109	0x6D	155	01101101	m	m
110	0x6E	156	01101110	n	n
111	0x6F	157	01101111	o	o
112	0x70	160	01110000	p	p
113	0x71	161	01110001	q	q
114	0x72	162	01110010	r	r
115	0x73	163	01110011	s	s
116	0x74	164	01110100	t	t
117	0x75	165	01110101	u	u
118	0x76	166	01110110	v	v
119	0x77	167	01110111	w	w
120	0x78	170	01111000	x	x
121	0x79	171	01111001	y	y
122	0x7A	172	01111010	z	z
123	0x7B	173	01111011	{	{
124	0x7C	174	01111100	\|	\|
125	0x7D	175	01111101	}	}
126	0x7E	176	01111110	~	~
127	0x7F	177	01111111	DEL	Delete

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