What is the difference between ASCII and extended ASCII?

Standard ASCII defines code points 0-127 using 7 bits, covering control characters, digits, letters and common punctuation. Extended ASCII uses the 128-255 range and varies by code page (Latin-1, Windows-1252, etc.), so those glyphs are not universal.

Why do values 0-31 show abbreviations instead of characters?

Code points 0-31 and 127 are non-printing control characters such as LF (line feed), CR (carriage return) and ESC (escape). They have no visible glyph, so the table shows their standard abbreviation instead.

How do I convert a character to its ASCII code?

Type the character into the search box and read the Dec column for its decimal code. The Hex, Oct and Binary columns give the same value in base 16, 8 and 2.

Is the space character part of ASCII?

Yes. Space is decimal 32 (hex 0x20), the first printable character. It is shown as SP in the table because a literal space is hard to see.

Does this tool send my input anywhere?

No. The entire table is generated in your browser with JavaScript and filtered locally. Nothing you type is uploaded.

ASCII Table — Gera Tools

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ASCII reference at a glance

The ASCII (American Standard Code for Information Interchange) table maps the integers 0 through 127 to characters: control codes, digits, uppercase and lowercase letters, and punctuation. This tool renders all 128 standard code points plus the extended 128-255 range, with each value shown in decimal, hexadecimal, octal and binary so you can convert between bases at a glance.

How it works

Every code point n is converted with the standard base routines: n.toString(16) for hex, n.toString(8) for octal and n.toString(2) for binary, then zero-padded to a fixed width. The printable glyph comes from String.fromCharCode(n). For control characters (0-31 and 127) there is no visible glyph, so the table substitutes the conventional three-letter abbreviation such as LF, CR or ESC. The search box matches a row when your query equals its decimal value, equals its two-digit hex code, or appears in the character name.

Tips and examples

Letter A is decimal 65, hex 0x41, octal 101, binary 01000001.
Lowercase letters are exactly 32 greater than their uppercase counterparts, so a is 97 — that constant 32 gap is why flipping bit 5 toggles case.
The digits 0-9 occupy 48-57, which is why subtracting 48 from a digit character gives its numeric value.
Use the Range selector set to “Control characters” to study the C0 control set used by terminals and serial protocols.