Complete ASCII to Binary Conversion Table
Use this ASCII table to look up a character's decimal code and eight-bit binary representation. It includes the 95 printable characters and a selection of control codes, with examples of how to read the values.
What is ASCII?
ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns numeric values to 128 characters. Developed in the 1960s, ASCII became the foundation for text representation in computers and communications equipment.
Each ASCII character is represented by a 7-bit binary number (though typically stored in 8-bit bytes). The standard includes control characters (0-31 and 127) and printable characters (32-126).
Printable ASCII Characters (32-126)
| Char | Dec | Hex | Binary | Char | Dec | Hex | Binary |
|---|---|---|---|---|---|---|---|
| 32 | 20 | 00100000 | ! | 33 | 21 | 00100001 | |
| " | 34 | 22 | 00100010 | # | 35 | 23 | 00100011 |
| $ | 36 | 24 | 00100100 | % | 37 | 25 | 00100101 |
| & | 38 | 26 | 00100110 | ' | 39 | 27 | 00100111 |
| ( | 40 | 28 | 00101000 | ) | 41 | 29 | 00101001 |
| * | 42 | 2A | 00101010 | + | 43 | 2B | 00101011 |
| , | 44 | 2C | 00101100 | - | 45 | 2D | 00101101 |
| . | 46 | 2E | 00101110 | / | 47 | 2F | 00101111 |
| 0 | 48 | 30 | 00110000 | 1 | 49 | 31 | 00110001 |
| 2 | 50 | 32 | 00110010 | 3 | 51 | 33 | 00110011 |
| 4 | 52 | 34 | 00110100 | 5 | 53 | 35 | 00110101 |
| 6 | 54 | 36 | 00110110 | 7 | 55 | 37 | 00110111 |
| 8 | 56 | 38 | 00111000 | 9 | 57 | 39 | 00111001 |
| : | 58 | 3A | 00111010 | ; | 59 | 3B | 00111011 |
| < | 60 | 3C | 00111100 | = | 61 | 3D | 00111101 |
| > | 62 | 3E | 00111110 | ? | 63 | 3F | 00111111 |
| @ | 64 | 40 | 01000000 | A | 65 | 41 | 01000001 |
| B | 66 | 42 | 01000010 | C | 67 | 43 | 01000011 |
| D | 68 | 44 | 01000100 | E | 69 | 45 | 01000101 |
| F | 70 | 46 | 01000110 | G | 71 | 47 | 01000111 |
| H | 72 | 48 | 01001000 | I | 73 | 49 | 01001001 |
| J | 74 | 4A | 01001010 | K | 75 | 4B | 01001011 |
| L | 76 | 4C | 01001100 | M | 77 | 4D | 01001101 |
| N | 78 | 4E | 01001110 | O | 79 | 4F | 01001111 |
| P | 80 | 50 | 01010000 | Q | 81 | 51 | 01010001 |
| R | 82 | 52 | 01010010 | S | 83 | 53 | 01010011 |
| T | 84 | 54 | 01010100 | U | 85 | 55 | 01010101 |
| V | 86 | 56 | 01010110 | W | 87 | 57 | 01010111 |
| X | 88 | 58 | 01011000 | Y | 89 | 59 | 01011001 |
| Z | 90 | 5A | 01011010 | [ | 91 | 5B | 01011011 |
| \ | 92 | 5C | 01011100 | ] | 93 | 5D | 01011101 |
| ^ | 94 | 5E | 01011110 | _ | 95 | 5F | 01011111 |
| ` | 96 | 60 | 01100000 | a | 97 | 61 | 01100001 |
| b | 98 | 62 | 01100010 | c | 99 | 63 | 01100011 |
| d | 100 | 64 | 01100100 | e | 101 | 65 | 01100101 |
| f | 102 | 66 | 01100110 | g | 103 | 67 | 01100111 |
| h | 104 | 68 | 01101000 | i | 105 | 69 | 01101001 |
| j | 106 | 6A | 01101010 | k | 107 | 6B | 01101011 |
| l | 108 | 6C | 01101100 | m | 109 | 6D | 01101101 |
| n | 110 | 6E | 01101110 | o | 111 | 6F | 01101111 |
| p | 112 | 70 | 01110000 | q | 113 | 71 | 01110001 |
| r | 114 | 72 | 01110010 | s | 115 | 73 | 01110011 |
| t | 116 | 74 | 01110100 | u | 117 | 75 | 01110101 |
| v | 118 | 76 | 01110110 | w | 119 | 77 | 01110111 |
| x | 120 | 78 | 01111000 | y | 121 | 79 | 01111001 |
| z | 122 | 7A | 01111010 | { | 123 | 7B | 01111011 |
| | | 124 | 7C | 01111100 | } | 125 | 7D | 01111101 |
| ~ | 126 | 7E | 01111110 |
Alphabet in Binary
Uppercase A-Z
Lowercase a-z
Numbers 0-9 in Binary
Control Characters (0-31)
Control characters are non-printable codes used to control devices. Here are the most important ones:
| Code | Decimal | Hex | Binary | Description |
|---|---|---|---|---|
| NUL | 0 | 00 | 00000000 | Null character |
| SOH | 1 | 01 | 00000001 | Start of Heading |
| STX | 2 | 02 | 00000010 | Start of Text |
| ETX | 3 | 03 | 00000011 | End of Text |
| EOT | 4 | 04 | 00000100 | End of Transmission |
| TAB | 9 | 09 | 00001001 | Horizontal Tab |
| LF | 10 | 0A | 00001010 | Line Feed (\n) |
| CR | 13 | 0D | 00001101 | Carriage Return (\r) |
| ESC | 27 | 1B | 00011011 | Escape |
| DEL | 127 | 7F | 01111111 | Delete |
How to Use This Table
- Find your character in the table
- Copy the binary representation (8 bits)
- For multiple characters, concatenate binary values with or without spaces
- Use our online converter for instant bulk conversion
Quick Example
Convert "CAT" to binary:
- C = 67 = 01000011
- A = 65 = 01000001
- T = 84 = 01010100
Result: 01000011 01000001 01010100
Check the examples
Technical reference
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