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ASCII Code

Tool to convert ASCII (binary, octal, decimal, hexadecimal), a character coding system that are numbered from 0 to 127 and coded in binary on 7 bits from 0000000 to 1111111.

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ASCII Code -

Tag(s) : Character Encoding

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ASCII Code

ASCII Converter

 


ASCII Encoder

 


Answers to Questions (FAQ)

What is the ASCII standard? (Definition)

The ASCII (American Standard Code for Information Interchange) character encoding standard is an encoding system that assigns a unique numerical code to each character (letters, numbers, symbols) on a computer, which facilitates the exchange of data between different computer systems.

This standard was defined in 1975 and contains 128 7-bit codes including 95 printable characters (i.e. the vast majority of characters allowing writing in English, but not fully in other languages, there are no accents for example).

Today this standard is outdated and supplanted by Unicode, which is backward compatible with ASCII.

How to encode using ASCII table?

Encoding/Encryption consists of replacing/translating each character with its value in the ASCII table (see below). This value can be written in several formats, depending on the needs, such as decimal, binary, hexadecimal or even octal.

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 decode/decrypt ASCII?

ASCII decoding/conversion consists of replacing/translating each value (binary, octal, decimal or hexadecimal) with the corresponding character in the ASCII table. Its representation can be independently 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 (7-bit Binary)CODE
01100011 01101111 01100100 01100101 (8-bit Binary)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 values are between 0 and 127 (decimal), the most common/frequent, corresponding to usual characters such as uppercase or lowercase letters are between 65 and 122 (decimal).

Any reference to skiing (ASCII ≈ a ski) or sky is a clue.

Computer languages usually use functions like fromCharCode(), CharCode(), Chr()

What are the different formats (HEX, BIN, DEC) to write in ASCII?

The ASCII table assigns a unique numeric code to each character, but this code (between 0 and 127) can be written in multiple ways depending on the needs.

— BIN: writing in binary base 2 (from 0 to 1111111)

— BIN /7: division every 7 bits (from 0000000 to 1111111)

— BIN /8: division every 8 bits (from 00000000 to 01111111)

— BIN /1-7: adaptive splitting between 1 and 7 bits

— BIN /1-8: adaptive splitting between 1 and 8 bits

— BIN /N: adaptive slicing from 1 to N bits

— OCT: writing in octal base 8 from (0 to 177)

— OCT /3: division every 3 digits (from 000 to 177)

— OCT /1-3: adaptive splitting of 1 to 3 octal digits

— OCT /N: adaptive slicing from 1 to N octal digits

— DEC: writing in decimal base 10 from (0 to 127)

— DEC /2: division every 2 digits (from 0 to 99, message without lower case)

— DEC /3: division every 3 digits (from 000 to 127)

— DEC /1-3: adaptive division of 1 to 3 digits

— DEC /N: adaptive division from 1 to N digits

— HEX: writing in base 16 hexadecimal (from 0 to 7F)

— HEX /2: division every 2 characters (from 00 to 7F)

— HEX /N: adaptive splitting from 1 to N hexadecimal digits

Numbers or characters that would not be valid in bases 2,8,10,16 are ignored.

Sometimes the symbols ⥅0 or ⥆0 are displayed, they mean that initial or final 0 have been added to allow decoding.

How many characters is represented by an ASCII code?

An ASCII code is represented on 7 bits, which allows 128 different characters to be represented.

In practice, 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 an 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=01000001 (65) and a=01100001 (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

DecimalOctalHexBinaryCharacterInfo
000000000000000NUL(Null char.)
001001010000001SOH(Start of Header)
002002020000010STX(Start of Text)
003003030000011ETX(End of Text)
004004040000100EOT(End of Transmission)
005005050000101ENQ(Enquiry)
006006060000110ACK(Acknowledgment)
007007070000111BEL(Bell)
008010080001000BS(Backspace)
009011090001001HT(Horizontal Tab)
0100120A0001010LF(Line Feed)
0110130B0001011VT(Vertical Tab)
0120140C0001100FF(Form Feed)
0130150D0001101CR(Carriage Return)
0140160E0001110SO(Shift Out)
0150170F0001111SI(Shift In)
016020100010000DLE(Data Link Escape)
017021110010001DC1(XON)(Device Control 1)
018022120010010DC2(Device Control 2)
019023130010011DC3(XOFF)(Device Control 3)
020024140010100DC4(Device Control 4)
021025150010101NAK(Negative Acknowledgement)
022026160010110SYN(Synchronous Idle)
023027170010111ETB(End of Trans. Block)
024030180011000CAN(Cancel)
025031190011001EM(End of Medium)
0260321A0011010SUB(Substitute)
0270331B0011011ESC(Escape)
0280341C0011100FS(File Separator)
0290351D0011101GS(Group Separator)
0300361E0011110RS(Request to Send)(Record Separator)
0310371F0011111US(Unit Separator)
032040200100000SP(Space)
033041210100001!
034042220100010"
035043230100011#
036044240100100$
037045250100101%
038046260100110&
039047270100111'
040050280101000(
041051290101001)
0420522A0101010*
0430532B0101011+
0440542C0101100,
0450552D0101101-
0460562E0101110.
0470572F0101111/
0480603001100000
0490613101100011
0500623201100102
0510633301100113
0520643401101004
0530653501101015
0540663601101106
0550673701101117
0560703801110008
0570713901110019
0580723A0111010:
0590733B0111011;
0600743C0111100<
0610753D0111101=
0620763E0111110>
0630773F0111111?
064100401000000@
065101411000001A
066102421000010B
067103431000011C
068104441000100D
069105451000101E
070106461000110F
071107471000111G
072110481001000H
073111491001001I
0741124A1001010J
0751134B1001011K
0761144C1001100L
0771154D1001101M
0781164E1001110N
0791174F1001111O
080120501010000P
081121511010001Q
082122521010010R
083123531010011S
084124541010100T
085125551010101U
086126561010110V
087127571010111W
088130581011000X
089131591011001Y
0901325A1011010Z
0911335B1011011[
0921345C1011100\
0931355D1011101]
0941365E1011110^
0951375F1011111_
096140601100000`
097141611100001a
098142621100010b
099143631100011c
100144641100100d
101145651100101e
102146661100110f
103147671100111g
104150681101000h
105151691101001i
1061526A1101010j
1071536B1101011k
1081546C1101100l
1091556D1101101m
1101566E1101110n
1111576F1101111o
112160701110000p
113161711110001q
114162721110010r
115163731110011s
116164741110100t
117165751110101u
118166761110110v
119167771110111w
120170781111000x
121171791111001y
1221727A1111010z
1231737B1111011{
1241747C1111100|
1251757D1111101}
1261767E1111110~
1271777F1111111DEL(Delete)

The values from 128 to 255 do not exist in the ASCII table. There are other tables often called extended ASCII which complement the ASCII code but are not ASCII.

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_0123456789:;<=>?
4_@ABCDEFGHIJKLMNO
5_PQRSTUVWXYZ[\]^_
6_`abcdefghijklmno
7_pqrstuvwxyz{|}~
8_
9_
A_¡¢£¤¥¦§¨©ª«¬-®¯
B_°±²³´µ·¸¹º»¼½¾¿
C_ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏ
D_ÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞß
E_àáâãäåæçèéêëìíîï
F_ðñòóôõö÷øùúûüýþÿ

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

What is the difference between ASCII and Unicode?

The main difference between ASCII and Unicode is the range of characters they can represent. ASCII uses a character table of 128 codes, which is suitable for representing basic English characters. In contrast, Unicode is a newer standard that uses a much larger character table, allowing thousands of characters used in different languages and scripts around the world to be represented.

Source code

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ASCII Code on dCode.fr [online website], retrieved on 2024-06-24, https://www.dcode.fr/ascii-code

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