ASCII Table — Dec, Hex, Oct & Binary

A byte is a number, and every text format eventually has to decide what number 65 means. ASCII settled it in 1963: 65 is the capital letter A. This table lists what all 256 byte values from 0 to 255 mean, spanning the original 128-value ASCII standard and the Latin-1 Supplement that fills the upper half with accented letters and symbols plain ASCII can't reach.

Each row shows the same byte in four notations at once: decimal, hexadecimal, octal and 8-bit binary, next to the character itself and its formal Unicode name. The first 32 codes and 127 have no printable glyph. Those rows show a three-letter abbreviation like LF or ESC instead, carried over from the original 1963 teletype control set.

Running the Search, Filters and Copy

1. Type into the search box: a decimal number like 65, a hex byte like 41 or 0x41, part of a name like grave, or paste the character itself.
2. Use the Control, Printable or Extended pills to narrow by range. The count on each pill updates live and doubles as a running tally.
3. Combine a pill and search text together — click Extended, then type letter, to see only the accented Latin letters.
4. Press Copy on any row. It copies the real character, or the raw control byte for non-printable rows, not a text label.

What It Accepts: ASCII Through Latin-1

Control (33 codes: 0–31 plus 127 DEL) and Printable (95 codes: 32–126) together make up the 128-value ASCII standard from 1963. Extended (128 codes: 128–255) is the Latin-1 Supplement: C1 control codes nobody actually types, followed by the accented Latin letters (À, é, ü) and symbols (§, ©, ×) that plain ASCII can't hold in a single byte. 256 rows total, all bundled as a static array with no network request.

What Happens When You Copy a Control Character

• Copying a control row such as LF copies the real invisible byte, not the letters "LF". Pasting it into a plain-text field shows nothing, which is correct, not broken.
• Eight control codes carry their classic C escape sequence in parentheses next to the name: \n, \t, \r and five others, because those are the ones a working programmer actually types by hand.
• Pasting a single character that matches a glyph exactly, such as @, jumps straight to that one row through an exact-glyph match, separate from the substring name search.
• A search with no matches, like zzz, shows "No characters match your search." rather than an empty page.