ASCII Table

The ASCII Table is a complete reference for the American Standard Code for Information Interchange - the character-to-number mapping that underpins almost every text file, programming language, and network protocol. It lists all 128 standard ASCII codes (0–127) alongside the extended Latin-1 upper half (128–255), and for each code it shows the decimal value, the hexadecimal and octal forms, the eight-bit binary, the printable glyph or control mnemonic, the HTML entity, and a plain-language name.

ASCII assigns a unique number to each letter, digit, punctuation mark, and control signal. A capital "A" is 65, a lowercase "a" is 97, the digit "0" is 48, and a space is 32. The first 32 codes are non-printing control characters such as carriage return (13), line feed (10), and tab (9) - invisible instructions that once drove teletypes and still terminate lines and delimit fields today. This table makes every one of those values visible and searchable in one place.

Everything runs in your browser. You can filter by category, search by character, decimal, hex, or entity name, click any value to copy it, and paste your own text to see the code behind every character. Nothing is uploaded, there is no sign-up, and the whole reference keeps working offline once the page has loaded.

Strictly, ASCII is a 7-bit standard covering codes 0 to 127, and everything from 128 to 255 belongs to an extension rather than to ASCII itself. The table shows Latin-1 for that upper range, which is the most common interpretation and is not the only one: the same byte is a different character under Windows-1252, and under UTF-8 those values are not standalone characters at all but parts of multi-byte sequences. That is the source of most mojibake, where an accented letter arrives as two unrelated symbols. The first 32 codes are control characters rather than printable ones, holdovers from teleprinters, and a handful still do real work: 9 is tab, 10 is line feed, 13 is carriage return, and the difference between the last two is why text files still move badly between operating systems.

The page also works as an ASCII table converter for your own text, which is handy when you check values in code. The Convert text to ASCII codes box starts with the sample Hi ©, and it returns 72 105 32 169, with © flagged because 169 is outside 7-bit ASCII. Those are the same numbers a Python ASCII table script prints: ord("H") returns 72 and chr(72) returns "H". In an ASCII table for C programming the values match too, since a char holds the code, so 'H' == 72 is true.