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ASCII Code

ASCII Converter

ASCII Encoder

Tool to convert ASCII (binary, octal, decimal, hexadecimal) automatically. ASCII (American Standard Code for Information Interchange) is a character coding system that are numbered from 0 to 127 and coded in binary on 7 bits from 0000000 to 1111111.

Answers to Questions

What is the ASCII standard

The ASCII character coding standard describes a correspondence table for coding characters (letters, numbers, symbols) on a computer. This standard was defined in 1975 and contains 128 7-bit codes including 95 printable characters.

Today this standard is old and has been superseded by Unicode, which is backward compatible with ASCII.

How to encrypt using ASCII table cipher

Encryption consists in replacing each character with its value in the ASCII table (see below).

Example: Convert dCode string in ASCII, that is writing 1100100 1000011 1101111 1100100 1100101 in binary (7-bit) or 100 67 111 100 101 in decimal.

Characters which don’t exist in the encoding table cannot be coded (no special characters, accents, etc.)

How to decrypt ASCII table cipher

ASCII conversion consists in replacing each value (binary, octal, decimal or hexadecimal) with the corresponding character in the ASCII table. Its representation can be formatted into binary (0-1), octal (0-7), decimal (0-9) or hexadecimal (0-9a-f).

Example:

ASCII Values (Format)	Texte clair
65 77 69 82 73 67 65 78 (Decimal)	AMERICAN
83 116 97 110 100 97 114 100 (Decimal)	Standard
1000011 1001111 1000100 1000101 (Binary 7bit)	CODE
49 4E 46 4F 52 4D 41 54 49 4F 4E (Hexadecimal)	INFORMATION
111 116 124 105 122 103 110 101 116 107 105 (Octal)	INTERCHANGE

How to recognize an ASCII ciphertext?

The message is generally written either in binary, or in decimal, or in hexadecimal (or rarely in octal).

The most frequent values must correspond to letters characters lowercase or uppercase (between 65 and 122 in decimal)

Any reference to skiing (ASCII = a ski) is a clue.

On how many characters is represented an ASCII code?

The ASCII code is almost always represented on 1 byte (8bits) even if it occupies only 7bits.

In binary, use either 7 bits or 8 bits (by adding a leading zero) to represent an ASCII character.

In octal, it is represented with 3 characters (from 000 to 177).

In decimal, the number is between 1 and 128 (from 1 to 3 characters).

In hexadecimal, 2 characters are used (from 00 to 7f).

How do I change from a lowercase ASCII letter to an uppercase letter?

In the ASCII code there is a difference of 32 between a uppercase letter and a lowercase letter. So add 32 to the ASCII code of a capital letter to get a lowercase and subtract 32 from the ASCII code of a lowercase letter to have a capital letter. The corresponding binary operation consists in setting the 5th bit (starting from the right) to 0 (upper case) or 1 (lower case).

Example: A=0100001 (65) and a=0110001 (65+32=97)

This trick does not work for accented letters, which are not in the basic ASCII table

What is the full ASCII table?

Full 7-bit ASCII table

Decimal	Octal	Hex	Binary	Character	Info
000	000	00	0000000	NUL	(Null char.)
001	001	01	0000001	SOH	(Start of Header)
002	002	02	0000010	STX	(Start of Text)
003	003	03	0000011	ETX	(End of Text)
004	004	04	0000100	EOT	(End of Transmission)
005	005	05	0000101	ENQ	(Enquiry)
006	006	06	0000110	ACK	(Acknowledgment)
007	007	07	0000111	BEL	(Bell)
008	010	08	0001000	BS	(Backspace)
009	011	09	0001001	HT	(Horizontal Tab)
010	012	0A	0001010	LF	(Line Feed)
011	013	0B	0001011	VT	(Vertical Tab)
012	014	0C	0001100	FF	(Form Feed)
013	015	0D	0001101	CR	(Carriage Return)
014	016	0E	0001110	SO	(Shift Out)
015	017	0F	0001111	SI	(Shift In)
016	020	10	0010000	DLE	(Data Link Escape)
017	021	11	0010001	DC1	(XON)(Device Control 1)
018	022	12	0010010	DC2	(Device Control 2)
019	023	13	0010011	DC3	(XOFF)(Device Control 3)
020	024	14	0010100	DC4	(Device Control 4)
021	025	15	0010101	NAK	(Negative Acknowledgement)
022	026	16	0010110	SYN	(Synchronous Idle)
023	027	17	0010111	ETB	(End of Trans. Block)
024	030	18	0011000	CAN	(Cancel)
025	031	19	0011001	EM	(End of Medium)
026	032	1A	0011010	SUB	(Substitute)
027	033	1B	0011011	ESC	(Escape)
028	034	1C	0011100	FS	(File Separator)
029	035	1D	0011101	GS	(Group Separator)
030	036	1E	0011110	RS	(Request to Send)(Record Separator)
031	037	1F	0011111	US	(Unit Separator)
032	040	20	0100000	SP	(Space)
033	041	21	0100001	!
034	042	22	0100010	«
035	043	23	0100011	#
036	044	24	0100100	$
037	045	25	0100101	%
038	046	26	0100110	&
039	047	27	0100111	‘
040	050	28	0101000	(
041	051	29	0101001	)
042	052	2A	0101010	*
043	053	2B	0101011	+
044	054	2C	0101100	,
045	055	2D	0101101	—
046	056	2E	0101110	.
047	057	2F	0101111	/
048	060	30	0110000	0
049	061	31	0110001	1
050	062	32	0110010	2
051	063	33	0110011	3
052	064	34	0110100	4
053	065	35	0110101	5
054	066	36	0110110	6
055	067	37	0110111	7
056	070	38	0111000	8
057	071	39	0111001	9
058	072	3A	0111010	:
059	073	3B	0111011	;
060	074	3C	0111100
063	077	3F	0111111	?
064	100	40	1000000	@
065	101	41	1000001	A
066	102	42	1000010	B
067	103	43	1000011	C
068	104	44	1000100	D
069	105	45	1000101	E
070	106	46	1000110	F
071	107	47	1000111	G
072	110	48	1001000	H
073	111	49	1001001	I
074	112	4A	1001010	J
075	113	4B	1001011	K
076	114	4C	1001100	L
077	115	4D	1001101	M
078	116	4E	1001110	N
079	117	4F	1001111	O
080	120	50	1010000	P
081	121	51	1010001	Q
082	122	52	1010010	R
083	123	53	1010011	S
084	124	54	1010100	T
085	125	55	1010101	U
086	126	56	1010110	V
087	127	57	1010111	W
088	130	58	1011000	X
089	131	59	1011001	Y
090	132	5A	1011010	Z
091	133	5B	1011011	[
092	134	5C	1011100	\
093	135	5D	1011101	]
094	136	5E	1011110	^
095	137	5F	1011111	_
096	140	60	1100000	`
097	141	61	1100001	a
098	142	62	1100010	b
099	143	63	1100011	c
100	144	64	1100100	d
101	145	65	1100101	e
102	146	66	1100110	f
103	147	67	1100111	g
104	150	68	1101000	h
105	151	69	1101001	i
106	152	6A	1101010	j
107	153	6B	1101011	k
108	154	6C	1101100	l
109	155	6D	1101101	m
110	156	6E	1101110	n
111	157	6F	1101111	o
112	160	70	1110000	p
113	161	71	1110001	q
114	162	72	1110010	r
115	163	73	1110011	s
116	164	74	1110100	t
117	165	75	1110101	u
118	166	76	1110110	v
119	167	77	1110111	w
120	170	78	1111000	x
121	171	79	1111001	y
122	172	7A	1111010	z
123	173	7B	1111011	<
124	174	7C	1111100	\|
125	175	7D	1111101	>
126	176	7E	1111110
127	177	7F	1111111	DEL	(Delete)

How to code non-ASCII characters such as accents?

Use another coding table, such as Unicode or in Europe the norm ISO/CEI 8859-1 Latin which includes the ASCII table in its first part (from 0 to 127) then specific characters for the following numbers (128-255).

_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
0_
1_
2_	␣	!	«	#	$	%	&	‘	(	)	*	+	,	—	.	/
3_	0	1	2	3	4	5	6	7	8	9	:	;	?
4_	@	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O
5_	P	Q	R	S	T	U	V	W	X	Y	Z	[	\	]	^	_
6_	`	a	b	c	d	e	f	g	h	i	j	k	l	m	n	o
7_	p	q	r	s	t	u	v	w	x	y	z	<	\|	>
8_
9_
A_	⌴	¡	¢	£	¤	¥	¦	§	¨	©	ª	«	¬	—	®	¯
B_	°	±	²	³	´	µ	¶	·	¸	¹	º	»	¼	½	¾	¿
C_	À	Á	Â	Ã	Ä	Å	Æ	Ç	È	É	Ê	Ë	Ì	Í	Î	Ï
D_	Ð	Ñ	Ò	Ó	Ô	Õ	Ö	×	Ø	Ù	Ú	Û	Ü	Ý	Þ	ß
E_	à	á	â	ã	ä	å	æ	ç	è	é	ê	ë	ì	í	î	ï
F_	ð	ñ	ò	ó	ô	õ	ö	÷	ø	ù	ú	û	ü	ý	þ	ÿ

All non-visible characters are control characters (see ASCII table from 1 to 31)

Source code

dCode retains ownership of the online ‘ASCII Code’ tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (PHP, Java, C#, Python, Javascript, Matlab, etc.) no data, script or API access will be for free, same for ASCII Code download for offline use on PC, tablet, iPhone or Android !

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