ASCII Table (Decimal, Hex, Octal, Binary)

Uppercase A is decimal 65, hex 41, octal 101 and binary 01000001. Lowercase a sits 32 codes higher at decimal 97, which is why toggling case is a single-bit change.

Codes 0 to 31 plus 127 are non-printing control characters that once steered teleprinters and terminals, such as NUL (0), bell BEL (7), tab HT (9), line feed LF (10) and carriage return CR (13). The table flags each with a control tag.

Standard ASCII defines exactly 128 codes, from 0 to 127. Codes 128 to 255 belong to extended sets like Latin-1 or Windows-1252 and are not part of standard ASCII, so this table stops at 127.

Line feed (LF, 10) moves down one line and is the Unix and macOS newline. Carriage return (CR, 13) returns to the start of the line. Windows text files use CR immediately followed by LF to end a line.

Search for the decimal code or the character and read across the row. The space, for example, is decimal 32, hex 20, octal 040 and binary 00100000, all shown side by side.

A single character is matched exactly and case-sensitively, so A finds code 65 and not 97. Longer queries match a decimal value, a hex code (with or without a 0x, backslash-x, U+ or hash prefix), an abbreviation like lf or nul, or any word in the description.

In ASCII the uppercase block starts at 65 and the lowercase block starts at 97, a gap of exactly 32. That constant offset means flipping bit six converts between the two cases, a trick still used in low-level string code.

The whole table is generated and searched in your browser, so nothing you type is uploaded. Once the page has loaded, the lookup keeps working even without a connection.

No. ASCII is a 7-bit standard covering only the first 128 code points, which Unicode later adopted as its own first block. For accented letters, other scripts or emoji you need a Unicode reference, not this ASCII table.