ASCII Converter

Paste your hex string into the "Codes → Text" box — with or without spaces, like "48 65 6C 6C 6F" or "48656C6C6F" — and it decodes each byte into a character automatically. Pick "Hexadecimal" from the Format menu if auto-detect guesses wrong.

Type or paste your text into the "Text → ASCII Codes" box. The Hexadecimal field updates instantly with each character's two-digit hex code, separated by spaces — click Copy to grab it.

Decimal is the plain number form of an ASCII code — "A" is 65. Type text into the left panel to see its Decimal codes, or paste decimal numbers separated by spaces or commas into the right panel (Auto-detect or the Decimal option both work) to translate them back into text.

Each ASCII character is one byte, so its binary form is 8 digits — "H" is 01001000. Paste a binary string into the "Codes → Text" box, spaced or unspaced as long as the digit count is a multiple of 8, to decode it back into text.

ASCII is a 128-character set (codes 0–127) covering English letters, digits, and basic punctuation. Unicode is a far larger standard covering every written language and emoji, and its first 128 code points are identical to ASCII — so plain ASCII text is always valid Unicode.

Accented letters, most emoji, and non-Latin scripts fall outside ASCII. This converter still encodes and decodes them correctly using their full Unicode code point — for example "é" is 233 — and a note appears whenever your input includes non-ASCII characters.

Yes, it's free with no signup required. Everything runs client-side in your browser with plain JavaScript — nothing you type is uploaded, logged, or stored anywhere.