ASCII to Binary Converter

This free online tool allows you to convert ASCII codes to binary notation.

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A tool that converts ASCII codes to binary notation is known as an ASCII to binary converter. Each character in the English language has a distinct numerical code thanks to the character encoding standard known as ASCII, which stands for American Standard Code for Information Interchange. Contrarily, binary notation uses a series of 0s and 1s—the two digits that make up the binary number system—to represent data.

It's crucial in many fields, including computer science and digital communications, to translate ASCII codes to binary notation. The representation of data like memory addresses and machine instructions in computer programs, for instance, frequently uses binary notation. To make working with this kind of data in programming and other applications simpler, ASCII codes can be converted to binary notation.

An ASCII to binary converter works by converting each ASCII code's decimal value to binary notation. Each character in ASCII is represented by a different decimal value between 0 and 127. Base 2 conversion, which converts decimal values to binary notation, can be used to do this.

In base 2 conversion, each decimal digit is replaced with its corresponding binary digit, either 0 or 1. The digits are then arranged in groups of 4, called nibbles, to create a binary number. For example, the ASCII code for the letter 'A' is 65 in decimal notation. To convert this to binary notation, we would first convert 65 to binary using base 2 conversions:

65 in decimal notation = 1000001 in binary notation

Since the binary number has 7 digits, we can add leading zeros to form a full byte (8 bits) of binary notation: 01000001

This is the binary representation of the ASCII code for the letter 'A'.

Why do we need to convert ASCII to binary?

We need to convert ASCII to binary for several key reasons:

  • Digital Representation: Computers and digital systems are fundamentally represented by binary code, which consists of 0s and 1s. At the most basic level, all data, including text, is processed and stored in binary format. To work with text on a computer, we must first convert human-readable characters (represented in ASCII) into binary that computers can comprehend and manipulate.
  • Storage: When you save a text file to your computer, it is saved in binary format. Each character in the text file is translated to its ASCII value before being stored in binary. Converting text to binary enables for more efficient storage space utilization.
  • Transmission: To improve transmission efficiency, data such as text messages or web pages are frequently encoded as binary. To prepare text data for transmission and afterwards decode it back into readable text at the destination, ASCII-to-binary conversion is required.
  • Processing: Computers execute a variety of actions on text data, ranging from searching and sorting to encryption and decryption. For efficient processing, these processes frequently require binary representations of characters.
  • Compatibility: Converting ASCII to binary ensures that different computer systems are compatible. ASCII is a widely acknowledged character encoding system that serves as the foundation for transforming text into a binary format that is generally understood.
  • Low-Level Operations: Binary operations are widely utilized in hardware and low-level software. Converting ASCII to binary allows text data to be seamlessly integrated with the underlying hardware and system software.

What is the difference between ASCII and binary code?

ASCII (American Standard Code for Information Interchange) and binary code are two independent notions in computers, each serving a specialized function. Here's the distinction between ASCII and binary code:


  • The ASCII character encoding standard is used to represent text, punctuation, and control characters.
  • It gives numerical values to characters, symbols, and control codes such as uppercase and lowercase letters, numerals, special symbols, and non-printable control characters.
  • To represent characters, ASCII employs a 7-bit code with values ranging from 0 to 127.
  • Characters are mapped to their respective ASCII decimal values, allowing them to be used as text.
  • ASCII is human-readable, which makes it simple to grasp and use for text processing, data sharing, and display.

Binary Code

  • Binary coding is a mathematical method that uses only two digits, 0 and 1. It is the basic language of digital computers.
  • All data types, not only text, are represented by binary code. It is capable of representing numbers, text, graphics, audio, and almost any other sort of data.
  • Each digit (bit) in binary code represents a power of two, while greater values are represented by bit combinations.
  • Binary code is machine-readable, which means it is the language of computers and digital systems.
  • Binary is unsuitable for humans due to its complexity, as it employs a series of 0s and 1s.

The primary distinction is that ASCII is a character encoding method designed for representing human-readable text, with each character assigned a decimal value within a 7-bit code. Binary code, on the other hand, is a numerical system that uses just 0s and 1s to represent all data kinds in the digital world, not only text. ASCII is a subset of binary code that is used to represent text within a computer's binary architecture.

How do I convert ASCII to binary manually?

To manually convert an ASCII character to binary:

  • Determine the character's ASCII decimal value.
  • Convert the decimal value to binary by dividing it by two and noting the remainders until you get to zero. To obtain the binary representation, read the remainders from bottom to top.

Can I convert multiple ASCII codes to binary at once?

Yes, several ASCII codes can be converted to binary at the same time. To accomplish this, you must repeat the process of determining the ASCII decimal values for each character and then converting those decimal values to binary. A binary sequence can be formed by converting a series of characters one after the other and concatenating their binary representations. As an example:

Let's say you want to convert the word "HELLO" to binary:

  • Determine the ASCII decimal values for the following characters: 'H' (72), 'E' (69), 'L' (76), 'L' (76), and 'O' (79).
  • Convert the following decimal values to binary: 'H' (1001000), 'E' (1000101), 'L' (1001100), 'L' (1001100), and 'O' (1001111).
  • Add these binary representations together: 100100010001011001001001001111

This method converts numerous ASCII codes to binary in a single sequence, making it useful for dealing with larger strings or character sequences.

What is the maximum number of bits in a binary code?

The maximum amount of bits in a binary code varies depending on the context and application. The number of bits utilized in a binary code is generally dictated by the range of values that must be represented. Binary code lengths that are commonly used include:

  • A 8-Bit Binary code (Byte) is capable of representing 28 (256) distinct values ranging from 0 to 255. It is frequently used to represent characters (ASCII), colors, and a variety of other data formats.
  • A 16-bit binary code may encode 216 (65,536) distinct values, giving it a wider range than an 8-bit code. It is utilized in applications that require a broader range of values.
  • A 32-bit binary code can represent 232 (nearly 4 billion) distinct values. It is utilized in memory addresses, IP addresses, and a variety of numerical applications.
  • A 64-bit binary code can encode 264 (an extremely large number) distinct values. It is widely used in applications that demand very large ranges, such as dealing with huge numbers or doing precise calculations.

The number of bits in a binary code is determined by the application and the range of values that must be represented. Longer binary codes can represent larger numerical values and more sophisticated data, but they may necessitate additional storage and processing resources. Shorter codes, on the other hand, are utilized for applications with narrower value ranges to improve storage and processing efficiency.

How to convert ASCII to binary in C?

In the C programming language, you can use bitwise operations and loops to process each ASCII character individually and convert it to its binary form. Here's an example of how to accomplish it:

#include <stdio.h>

int main() {
    // Input ASCII string
    const char* asciiString = "Hello";

    // Iterate through each character in the ASCII string
    for (int i = 0; asciiString[i] != ''; i++) {
        // Get the ASCII value of the character
        int asciiValue = asciiString[i];

        // Convert the ASCII value to binary
        for (int j = 7; j >= 0; j--) {
            int binaryDigit = (asciiValue >> j) & 1;
            printf("%d", binaryDigit);

        // Add a space for readability (optional)
        printf(" ");


    return 0;

In this code:

  • We define an ASCII string "Hello" as an example. You can replace this with any ASCII string you want to convert to binary.
  • We use a for loop to run through each character in the string.
  • For each character, we utilize another for loop to transform the ASCII value to binary.
  • In the inner loop, we perform bitwise operations to extract each bit of the ASCII value. We right-shift the ASCII value by j places and then apply a bitwise AND operation with 1 to obtain the least significant bit (LSB).
  • We print each binary digit, and you can add a space for reading if desired.

When you run this code, the ASCII characters in the string are converted to binary representations and printed to the console. As needed, you can modify the code to accommodate longer ASCII sequences or incorporate it into a larger program.

How to convert binary to ASCII in Python?

Python's built-in functions int and chr can be used to convert binary input to ASCII. Here's an easy example:

# Binary data (as a string)
binary_data = "01001000 01100101 01101100 01101100 01101111"  # Example: "Hello"

# Split the binary data into individual bytes
binary_bytes = binary_data.split()  # Split on space character

# Convert each binary byte to an integer and then to ASCII
ascii_string = ''.join([chr(int(byte, 2)) for byte in binary_bytes])

# Print the resulting ASCII string

In this code:

  • The binary data is defined as a string with spaces between each binary byte. Replace binary_data with the binary data to be converted.
  • We used the.split() method to split the binary data into individual bytes, which splits the string based on spaces, resulting in a list of binary bytes.
  • We go through each binary byte, convert it to an integer using int(byte, 2), where 2 specifies that the input is in base 2 (binary), and then convert the integer to the corresponding ASCII character using chr.
  • The resulting ASCII characters are joined together to make the final ASCII string.
  • Finally, we output the ASCII string that was generated.

When you run this code with the supplied binary data, it will convert the binary bytes to ASCII and print the associated ASCII string ("Hello" in this example). In Python, you may use the same method to convert additional binary data to ASCII.

ASCII Characters and Binary Numbers System

ASCII (American Standard Code for Information Interchange) is a character encoding standard that provides each character a unique numerical value, allowing text characters to be represented in computer systems as binary integers. ASCII assigns numerical values ranging from 0 to 127 to the most regularly used characters, which include letters, numbers, and different symbols.

Here's a quick rundown of how ASCII characters are encoded as binary numbers:

  • Binary Representation: Each ASCII character is represented by a 7-bit binary number (a mixture of 0s and 1s). The characters in the computer's memory are represented by these binary numbers.
  • Decimal Equivalent: The binary representation has a decimal counterpart, which is a numerical value between 0 and 127. For example, the uppercase letter 'A' has an ASCII value of 65 and a binary equivalent of 01000001.
  • Mapping: There is a one-to-one mapping between numerical numbers and characters in ASCII. The decimal value 65, for example, corresponds to the capital letter 'A,' while the decimal value 66 corresponds to 'B,' and so on.
  • Extended ASCII: Unlike the regular ASCII encoding, which utilizes 7 bits, extended ASCII encodings employ 8 bits, allowing for a wider range of characters. Extended ASCII has more characters and symbols than ordinary ASCII, however it is not as widely supported.

Here are a few examples of ASCII characters and their binary representations:

  • Uppercase 'A'
    • ASCII Decimal Value: 65
    • Binary Representation: 01000001
  • Lowercase 'a'
    • ASCII Decimal Value: 97
    • Binary Representation: 01100001
  • Digit '0'
    • ASCII Decimal Value: 48
    • Binary Representation: 00110000
  • Space
    • ASCII Decimal Value: 32
    • Binary Representation: 00100000
  • Exclamation Mark '!'
    • ASCII Decimal Value: 33
    • Binary Representation: 00100001

Understanding the binary representation of ASCII letters is critical for working with character data in computing, particularly in low-level programming and text processing activities. It enables computers to store, transport, and alter text using binary data, making it a critical component of character encoding in digital systems.

ASCII Characters To Binary Numbers Conversion Table

Here is a simple table that shows the conversion of common ASCII characters to their corresponding binary representations:

ASCII CharacterBinary Representation

This table includes some common uppercase letters, numbers, and a few special characters. Each character corresponds to an 8-bit binary representation based on the ASCII encoding standard.

Frequently Asked Questions

  • What is Hello in binary ASCII?
  • "Hello" in binary ASCII is represented as: 01001000 01100101 01101100 01101100 01101111.

  • What is the full form of ASCII?
  • ASCII stands for "American Standard Code for Information Interchange." It is a character encoding standard that represents text characters using numerical values.

  • Why is ASCII 8 bits?
  • ASCII was initially intended to be a 7-bit encoding method. In some systems, an 8th bit (parity bit) was eventually added for error-checking purposes. The basic ASCII character set encodes using 7 bits.

  • How to write ASCII code?
  • To create ASCII code for a character, look up the decimal value associated with that character in an ASCII table. Most computer languages allow you to enclose characters in single quotes and represent them using their ASCII values, such as 'A' for 65 or 'a' for 97. For example, the ASCII character 'A' with a decimal value of 65 is represented by 'A'.

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