ASCII Code Converter

This tool converts text into the numeric codes that represent each character, in decimal, hexadecimal and binary, and converts a list of codes back into text. Every character a computer handles, each letter, digit, space and symbol, is stored as a number according to a character set: the classic ASCII set for the basic English characters and the wider Unicode set for everything else. Seeing those codes is a useful exercise for understanding how text is stored, a practical tool for programming and debugging when you need a character's code point, and a bit of fun for puzzles and secret messages. This converter shows them clearly. You paste your text and the calculator lists each character alongside its code in decimal, hexadecimal and binary, the three ways codes are commonly written. Switch to the reverse mode and enter a list of decimal codes, and it turns them back into the characters they represent. Everything runs in your browser, so nothing is uploaded, and the result updates as you type. Use it to find the code point of a character, to convert text to codes for a program or puzzle, to learn how characters map to numbers, or for development and debugging. The decimal code is the character's position in the character set, the hexadecimal is the same number in base sixteen as often used in programming, and the binary shows the underlying bits. For the basic English characters these match the familiar ASCII table, where capital A is 65 and lowercase a is 97, while characters beyond that range use their Unicode code points. This makes the link between the characters we read and the numbers a computer stores tangible, and lets you move between the two whenever you need.

Shows decimal, hexadecimal and binary codes for each character. Decode mode reads decimal codes separated by spaces or commas. Uses Unicode code points. Runs in your browser.