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ASCII Character Encoding - GeeksforGeeks

ASCII Character Encoding

Last Updated : 23 Jul, 2025

ASCII stands for American Standard Code for Information Interchange. It is a character encoding standard that has been a foundational element in computing for decades.

Uses 7 bits to encode 128 characters (0–127); modern usage often stores them in 8‑bit bytes with the high bit set to 0.
There are 95 codes (32–126) for printable characters including space, digits, uppercase/lowercase English letters, punctuation, and symbols
And 33 control characters that are non‑printing (0–31, 127) for formatting and control (e.g., NUL, LF, CR)
Serves as the basis for Unicode's first 128 code points; still fundamental in programming, data exchange, and legacy systems

Historical Background

ASCII has a rich history, dating back to its development in the early 1960s. Originating from telegraph code and Morse code, ASCII emerged as a standardized way to represent characters in computers, facilitating data interchange.

ASCII Encoding Standards ASCII Character Set

The ASCII character set includes standard characters such as letters, numbers, punctuation, and control characters. Each character is assigned a unique seven-bit binary code.

Decimal Character Description 0 NUL Null 1 SOH Start of Header 2 STX Start of Text 3 ETX End of Text 4 EOT End of Transmit 5 ENQ Enquiry 6 ACK Acknowledge 7 BEL Bell 8 BS Backspace 9 HT Horizontal Tab 10 LF Line Feed 11 VT Vertical Tab 12 FF Form Feed 13 CR Carriage Return 14 SO Shift Out 15 SI Shift In ... ... ... 32 (space) Space 33 ! Exclamation Mark 34 " Quotation Mark ... ... ... 65 A Uppercase A 66 B Uppercase B ... ... ... 97 a Lowercase a 98 b Lowercase b ... ... ... 127 DEL Delete ASCII Control Characters

In addition to printable characters, ASCII includes control characters for formatting and controlling devices. These include characters like carriage return and line feed.

While the original ASCII set comprises 128 characters, extended ASCII introduces an additional 128 characters, accommodating symbols and characters for different languages.

Decimal Character Description 128 Ç Latin Capital Letter C-cedilla 129 ü Latin Small Letter U with Diaeresis 130 é Latin Small Letter E with Acute 131 â Latin Small Letter A with Circumflex 132 ä Latin Small Letter A with Diaeresis 133 à Latin Small Letter A with Grave 134 å Latin Small Letter A with Ring Above ... ... ... 255 ÿ Latin Small Letter Y with Diaeresis ASCII Table

A comprehensive ASCII table organizes characters and their corresponding binary, decimal, and hexadecimal representations.

Decimal Hex Binary Character Description 0 00 00000000 NUL Null 1 01 00000001 SOH Start of Header 2 02 00000010 STX Start of Text 3 03 00000011 ETX End of Text 4 04 00000100 EOT End of Transmit 5 05 00000101 ENQ Enquiry 6 06 00000110 ACK Acknowledge 7 07 00000111 BEL Bell 8 08 00001000 BS Backspace 9 09 00001001 HT Horizontal Tab 10 0A 00001010 LF Line Feed 11 0B 00001011 VT Vertical Tab 12 0C 00001100 FF Form Feed 13 0D 00001101 CR Carriage Return 14 0E 00001110 SO Shift Out 15 0F 00001111 SI Shift In 16 10 00010000 DLE Data Link Escape 17 11 00010001 DC1 Device Control 1 (oft. XON) 18 12 00010010 DC2 Device Control 2 19 13 00010011 DC3 Device Control 3 (oft. XOFF) 20 14 00010100 DC4 Device Control 4 21 15 00010101 NAK Negative Acknowledge 22 16 00010110 SYN Synchronous Idle 23 17 00010111 ETB End of Transmission Block 24 18 00011000 CAN Cancel 25 19 00011001 EM End of Medium 26 1A 00011010 SUB Substitute 27 1B 00011011 ESC Escape 28 1C 00011100 FS File Separator 29 1D 00011101 GS Group Separator 30 1E 00011110 RS Record Separator 31 1F 00011111 US Unit Separator 32 20 00100000 (space) Space 33 21 00100001 ! Exclamation Mark 34 22 00100010 " Quotation Mark 35 23 00100011 # Number Sign 36 24 00100100 $ Dollar Sign 37 25 00100101 % Percent Sign 38 26 00100110 & Ampersand 39 27 00100111 ' Apostrophe (Single Quote) 40 28 00101000 ( Left Parenthesis 41 29 00101001 ) Right Parenthesis 42 2A 00101010 * Asterisk 43 2B 00101011 + Plus Sign 44 2C 00101100 , Comma 45 2D 00101101 - Hyphen (Minus Sign) 46 2E 00101110 . Period (Full Stop) 47 2F 00101111 / Solidus (Slash) 48 30 00110000 0 Digit Zero 49 31 00110001 1 Digit One 50 32 00110010 2 Digit Two 51 33 00110011 3 Digit Three 52 34 00110100 4 Digit Four 53 35 00110101 5 Digit Five 54 36 00110110 6 Digit Six 55 37 00110111 7 Digit Seven 56 38 00111000 8 Digit Eight 57 39 00111001 9 Digit Nine 58 3A 00111010 : Colon 59 3B 00111011 ; Semicolon 60 3C 00111100 < Less Than (Angle Bracket, Left Pointing) 61 3D 00111101 = Equals Sign 62 3E 00111110 > Greater Than (Angle Bracket, Right Pointing) 63 3F 00111111 ? Question Mark 64 40 01000000 @ At Sign 65 41 01000001 A Uppercase A 66 42 01000010 B Uppercase B 67 43 01000011 C Uppercase C 68 44 01000100 D Uppercase D 69 45 01000101 E Uppercase E 70 46 01000110 F Uppercase F 71 47 01000111 G Uppercase G 72 48 01001000 H Uppercase H 73 49 01001001 I Uppercase I 74 4A 01001010 J Uppercase J 75 4B 01001011 K Uppercase K 76 4C 01001100 L Uppercase L 77 4D 01001101 M Uppercase M 78 4E 01001110 N Uppercase N 79 4F 01001111 O Uppercase O 80 50 01010000 P Uppercase P 81 51 01010001 Q Uppercase Q 82 52 01010010 R Uppercase R 83 53 01010011 S Uppercase S 84 54 01010100 T Uppercase T 85 55 01010101 U Uppercase U 86 56 01010110 V Uppercase V 87 57 01010111 W Uppercase W 88 58 01011000 X Uppercase X 89 59 01011001 Y Uppercase Y 90 5A 01011010 Z Uppercase Z 91 5B 01011011 [ Left Square Bracket 92 5C 01011100 \ Backslash 93 5D 01011101 ] Right Square Bracket 94 5E 01011110 ^ Caret (Circumflex Accent) 95 5F 01011111 _ Underscore 96 60 01100000 ` Grave Accent 97 61 01100001 a Lowercase a 98 62 01100010 b Lowercase b 99 63 01100011 c Lowercase c 100 64 01100100 d Lowercase d 101 65 01100101 e Lowercase e 102 66 01100110 f Lowercase f 103 67 01100111 g Lowercase g 104 68 01101000 h Lowercase h 105 69 01101001 i Lowercase i 106 6A 01101010 j Lowercase j 107 6B 01101011 k Lowercase k 108 6C 01101100 l Lowercase l 109 6D 01101101 m Lowercase m 110 6E 01101110 n Lowercase n 111 6F 01101111 o Lowercase o 112 70 01110000 p Lowercase p 113 71 01110001 q Lowercase q 114 72 01110010 r Lowercase r 115 73 01110011 s Lowercase s 116 74 01110100 t Lowercase t 117 75 01110101 u Lowercase u 118 76 01110110 v Lowercase v 119 77 01110111 w Lowercase w 120 78 01111000 x Lowercase x 121 79 01111001 y Lowercase y 122 7A 01111010 z Lowercase z 123 7B 01111011 { Left Curly Brace 124 7C 01111100 | Vertical Bar 125 7D 01111101 } Right Curly Brace 126 7E 01111110 ~ Tilde 127 7F 01111111 DEL Delete ASCII Representation Binary Representation

ASCII characters are represented in binary, providing a machine-readable format that computers use for internal processing.

Binary Character Description 00000000 NUL Null 00000001 SOH Start of Header 00000010 STX Start of Text 00000011 ETX End of Text 00000100 EOT End of Transmit 00000101 ENQ Enquiry 00000110 ACK Acknowledge 00000111 BEL Bell 00001000 BS Backspace 00001001 HT Horizontal Tab 00001010 LF Line Feed 00001011 VT Vertical Tab 00001100 FF Form Feed 00001101 CR Carriage Return 00001110 SO Shift Out 00001111 SI Shift In ... ... ... 00100000 (space) Space 00100001 ! Exclamation Mark 00100010 " Quotation Mark ... ... ... 01000001 A Uppercase A 01000010 B Uppercase B ... ... ... 01100001 a Lowercase a 01100010 b Lowercase b ... ... ... 01111111 DEL Delete Decimal Representation

In decimal form, ASCII codes offer a human-readable representation, simplifying discussions and documentation.

The hexadecimal representation of ASCII codes is commonly used in programming and digital design.

Hexadecimal Character Description 00 NUL Null 01 SOH Start of Header 02 STX Start of Text 03 ETX End of Text 04 EOT End of Transmit 05 ENQ Enquiry 06 ACK Acknowledge 07 BEL Bell 08 BS Backspace 09 HT Horizontal Tab 0A LF Line Feed 0B VT Vertical Tab 0C FF Form Feed 0D CR Carriage Return 0E SO Shift Out 0F SI Shift In ... ... ... 20 (space) Space 21 ! Exclamation Mark 22 " Quotation Mark ... ... ... 41 A Uppercase A 42 B Uppercase B ... ... ... 61 a Lowercase a 62 b Lowercase b ... ... ... 7F DEL Delete ASCII in Computing ASCII in Programming Languages

Programming languages extensively use ASCII for representing characters and symbols in source code.

ASCII in Data Transmission

ASCII is fundamental in data transmission protocols, ensuring compatibility and readability when exchanging information between systems.

ASCII Art and Design

Artistic expressions, known as ASCII art, leverage ASCII characters to create visual designs and graphics.

ASCII Extended Sets

ASCII-8: ASCII-8 extends the character set, accommodating additional symbols and characters.
ASCII-16: In ASCII-16, further characters are added, expanding the encoding possibilities.
ASCII-32: ASCII-32 continues the extension, providing even more characters for diverse applications.
ASCII-64: With ASCII-64, the character set grows, supporting an array of symbols and international characters.
ASCII-128: The extended set ASCII-128 completes the 256-character spectrum, including a wide range of symbols.

ASCII vs. Unicode Key Differences

ASCII and Unicode are both character encoding standards, but they have key differences in terms of scope and functionality. Let's compare ASCII and Unicode in a tabular format:

Feature ASCII Unicode Definition ASCII (American Standard Code for Information Interchange) is a character encoding standard that uses 7 or 8 bits to represent characters, mainly limited to the English alphabet, numerals, and a few special characters. Unicode is a character encoding standard that aims to provide a unique code point for every character, regardless of platform, program, or language. It uses a variable number of bits (8, 16, or 32) to represent characters. Scope Originally designed for English and a few other Western languages. Designed to be a universal character encoding standard that supports a vast range of languages, symbols, and characters from various writing systems. Bit Usage Typically uses 7 bits (extended ASCII uses 8 bits). Can use 8, 16, or 32 bits per character, allowing it to represent a much larger number of characters. Number of Characters Limited to 128 (with 7 bits) or 256 (with 8 bits). Can represent over a million unique characters. Multilingual Support Primarily supports English and a few Western languages. Comprehensive support for almost all languages, including scripts like Cyrillic, Arabic, Chinese, Japanese, and many others. Backward Compatibility Limited, as it was primarily designed for English and does not have built-in support for characters from various languages. Maintains backward compatibility with ASCII. The first 128 Unicode code points correspond to ASCII, ensuring compatibility with existing ASCII data. Representation Uses one byte (8 bits) per character. Variable-length encoding, using 8, 16, or 32 bits per character. Standard Organization Developed by ANSI (American National Standards Institute). Developed by the Unicode Consortium, a non-profit organization that maintains and develops the Unicode standard.

ASCII and Unicode differ in scope, with ASCII representing 128 characters and Unicode accommodating a vast array of characters from various scripts.

When to Use ASCII vs. Unicode

While ASCII is suitable for English and basic character encoding, Unicode is preferred for multilingual and diverse character requirements.

Practical Examples of ASCII Converting Characters to ASCII

Demonstrations on converting characters to their ASCII equivalents for practical applications.

ASCII in File Handling

ASCII, as a character encoding standard, plays a significant role in file handling. When working with text files, understanding how ASCII characters are encoded and decoded is essential. Here's how ASCII is involved in file handling:

Character Representation:
- ASCII represents characters using numeric codes. Each character is assigned a decimal value between 0 and 127, and this value is used to represent the character in binary form.
Text File Encoding:
- Text files are often encoded using ASCII or its extended forms. The encoding determines how characters are represented in the file. ASCII encoding is a common choice for plain text files, especially when dealing with English text.
Binary Files:
- While ASCII is commonly associated with text files, binary files can also use ASCII characters for metadata or textual information within the file. For example, file headers or configuration data may be encoded using ASCII.
File Reading and Writing:
- When reading from or writing to text files using programming languages, developers need to specify the character encoding. ASCII encoding (or its extensions like UTF-8) is chosen based on the nature of the data being handled.
```
# Example in Python using UTF-8 encoding
with open('example.txt', 'r', encoding='utf-8') as file:
    content = file.read()
```
Line Endings:
- ASCII includes control characters for line feed (LF or \n) and carriage return (CR or \r). The choice of line endings (Unix/Linux using LF, Windows using CRLF) affects how text files are handled on different operating systems.
File Transfer Protocols:
- ASCII characters are often used in file transfer protocols, especially in FTP (File Transfer Protocol). When transferring text files, the client and server may negotiate to use ASCII mode to ensure correct line ending conversions.
Programming Language Support:
- Many programming languages provide built-in functions for reading and writing files. These functions often allow developers to specify the character encoding, and ASCII encoding can be chosen when dealing with simple text files.
Code Files:
- Source code files for programming languages are often encoded using ASCII or UTF-8, which is backward-compatible with ASCII. This ensures that the code can be read and interpreted correctly by various compilers and interpreters.
Metadata and Headers:
- ASCII characters are commonly used in file metadata, headers, or configuration files where human-readable text is needed. For example, XML or JSON files may use ASCII for the textual representation of data.
Error Handling:
- When handling files, it's essential to consider error handling for cases where the file contains unexpected characters or encoding issues. Proper error handling can prevent data corruption and ensure the robustness of the application.

ASCII in URL Encoding

URL encoding, also known as percent-encoding, is a method used to represent certain characters in a URL by replacing them with a percent sign (%) followed by two hexadecimal digits. While URL encoding can encompass a broader range of characters, ASCII characters play a significant role in this process. Here's how ASCII is involved in URL encoding:

Character Representation:
- ASCII characters are a subset of the characters that can be directly used in a URL without encoding. These include alphanumeric characters (A-Z, a-z, 0-9) and a set of special characters (such as hyphen, underscore, period, and tilde).
Reserved Characters:
- Certain ASCII characters have special meanings in a URL and are reserved for specific purposes. For example:
  - Reserved Characters: ! * ' ( ) ; : @ & = + $ , / ? % # [ ] -
  - Unreserved Characters: Alphanumeric characters (A-Z, a-z, 0-9), hyphen, underscore, period, and tilde.
Encoding Reserved Characters:
- When a reserved character needs to be included in a URL, it must be URL-encoded. For instance, space is represented as %20, and the exclamation mark (!) is represented as %21. This prevents misinterpretation of these characters by the URL parser.
```
Original: Hello World!
URL Encoded: Hello%20World%21
```
Percent Encoding:
- Percent encoding involves representing non-alphanumeric characters using the percent sign (%) followed by two hexadecimal digits. This ensures that these characters are correctly interpreted in a URL.
```
Original: /path/to/file with spaces.txt
URL Encoded: /path/to/file%20with%20spaces.txt
```
ASCII Control Characters:
- ASCII control characters and non-printable characters, which are not allowed in URLs, are often excluded. However, if they need to be included, they are represented using percent encoding.
```
Original: Line1\nLine2
URL Encoded: Line1%0ALine2
```
Programming Language Support:
- When working with URLs in programming, libraries and functions for URL encoding are often provided. These functions take care of encoding reserved characters and ensuring that the resulting URL is valid.
```
# Example in Python
import urllib.parse

url = "https://example.com/path with spaces"
encoded_url = urllib.parse.quote(url)
print(encoded_url)
```
Query Parameters:
- In URLs, query parameters are separated by the ampersand (&) symbol. When the parameter values contain reserved or non-alphanumeric characters, these characters are URL-encoded.
```
Original: ?name=John Doe&age=30
URL Encoded: ?name=John%20Doe&age=30
```

ASCII in Networking

ASCII in Protocols (HTTP, FTP, etc.): The integral role of ASCII in networking protocols like HTTP and FTP, ensuring standardized communication.
ASCII in Email Communication: ASCII's role in email systems, influencing the way messages are transmitted and displayed.
ASCII in Security
ASCII in Passwords: Exploration of ASCII's role in password representation and security considerations.
ASCII in Encryption: Understanding how ASCII encoding principles align with encryption algorithms for secure data transmission.

Limitations of ASCII

ASCII, while widely used and simple, has some limitations, especially in the context of modern computing needs. Here are some of the key limitations of ASCII:

Limited Character Set: ASCII is limited to representing only 128 characters (7-bit encoding) or 256 characters (8-bit encoding). This limitation is restrictive when dealing with languages and writing systems beyond the basic Latin alphabet.
No Support for Non-Latin Characters: ASCII does not provide support for characters outside the English alphabet, such as accented characters in European languages, characters from Asian languages, or special symbols used in various writing systems.
Lack of Standardization for Extended ASCII: While ASCII itself only uses 7 bits, the extended ASCII set (8-bit encoding) is not standardized across different systems. Different extended ASCII encodings have been developed, leading to compatibility issues.
No Representation for Control Characters Beyond 127: ASCII control characters with decimal values greater than 127 have specific functions (e.g., extended Latin characters), but they are not standardized. Their interpretation can vary among different systems.
Not Well-Suited for Multilingual Text: As a character encoding standard, ASCII is not designed to handle the diverse needs of multilingual text representation. Modern applications often require support for a wide range of languages, which ASCII cannot accommodate adequately.
Limited Symbolic Representation: ASCII lacks representation for certain symbols and mathematical characters commonly used in scientific and technical contexts. This limitation hinders its suitability for applications requiring these symbols.
Fixed-Length Encoding: ASCII uses a fixed-length encoding of 7 or 8 bits per character. While this simplicity was an advantage in early computing, it is less efficient than variable-length encodings like UTF-8 used by Unicode. Variable-length encoding allows more efficient storage of characters.
No Provision for Metadata or Formatting: ASCII is primarily focused on character representation and lacks provisions for metadata, formatting information, or characters with specialized functions in modern text processing.
Globalization Challenges: As a result of its limitations, ASCII poses challenges when developing applications for a global audience with diverse linguistic and cultural requirements.

Handling Non-ASCII Characters

Handling non-ASCII characters is crucial when dealing with text data that goes beyond the basic Latin alphabet covered by ASCII. Here are some common approaches and considerations for handling non-ASCII characters:

Unicode Encoding:
- UTF-8, UTF-16, UTF-32: Unicode is a character encoding standard that supports a vast range of characters from different languages and writing systems. UTF-8, UTF-16, and UTF-32 are different encoding schemes under the Unicode standard, allowing representation of characters using 8, 16, or 32 bits per character, respectively.
Use Unicode-Compatible Data Types:
- When working with programming languages or databases, ensure that you use data types that support Unicode characters. For example, in many programming languages, using string or char data types that support Unicode is essential.
Normalization:
- Unicode Normalization is the process of transforming text into a standardized form, ensuring that equivalent sequences of characters are represented in a consistent way. This is important when dealing with characters that can be represented in multiple ways, such as accented characters.
Libraries and Frameworks:
- Many programming languages provide libraries and frameworks that handle Unicode and non-ASCII characters seamlessly. Utilize these libraries to ensure correct processing of text data.
File Encodings:
- When working with text files, be aware of the encoding used. UTF-8 is a common and widely supported encoding for handling Unicode characters. Make sure that the applications reading and writing files support the chosen encoding.
Database Collation:
- Database collation settings determine how string comparison operations are performed. Choose a collation that supports the language and characters you are working with. Unicode collations are designed to handle a wide range of characters.
Web Page Character Encoding:
- Specify the character encoding in the <meta> tag of HTML documents to ensure that web browsers interpret and display non-ASCII characters correctly.
Regular Expressions:
- When using regular expressions, ensure that the patterns are Unicode-aware. Many programming languages provide Unicode-aware regular expression functions.
Input and Output Handling:
- When dealing with user input or displaying information to users, ensure that input forms, databases, and web pages are configured to handle non-ASCII characters. Validate and sanitize user input to prevent issues.
Testing and Internationalization:
- Conduct thorough testing, especially if your application is intended for a global audience. Consider internationalization (i18n) best practices to make your software adaptable to various languages and regions.

By embracing Unicode and adopting best practices for handling non-ASCII characters, you can ensure that your applications are capable of supporting a wide range of languages and writing systems. This is particularly important in today's globalized and interconnected world.

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