ASCII Converter

ASCII converter: turn any text into ASCII character codes and convert ASCII codes back into readable text instantly. Free, private, in-browser, no signup.

Client-side only Nothing stored No account needed
Last verified July 2026

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This tool processes the selected input in your browser. Review the output before relying on it; format and file behavior can vary by browser and source data.

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What does this converter do?

ASCII converter: turn any text into ASCII character codes and convert ASCII codes back into readable text instantly. Free, private, in-browser, no signup.

  • Printable ASCII spans codes 32-126; "A" is 65, "a" is 97, and "0" is 48.
Bar chart of common ASCII codes from tab to lowercase a
ASCII spans 0 to 127, and printable text only starts at 32.
Formula & evidence

How this calculator works

Reviewed 2026-09-20 · BoringToolsKit Editorial Team

Formula

ASCII code = the character code unit returned for each input character (String.charCodeAt). Printable ASCII runs 32-126, so "A" = 65 and "a" = 97; codes outside that range are control or extended characters.

Sources

Sources support the method, terminology, or planning context. Editable assumptions remain your responsibility.

Assumptions to verify

  • Inputs are treated as exact decimal values.
  • Standard (not historical or survey) unit definitions are used.
  • The calculation uses the factors at the precision shown in the formula panel; rounding beyond that is display-only and adds no accuracy.

Frequently asked questions

Why do letters and symbols give different code ranges?

Printable ASCII occupies 32-126: digits start at 48 ("0"), uppercase A at 65, lowercase a at 97. Codes below 32 are control characters (tab, newline) and are not printable text.

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Cite this tool

BoringToolsKit. “ASCII Converter.” boringtoolskit.com/ascii-converter/ (reviewed 2026-09-20). Free to reference in articles, syllabi, and answer posts with a link.

Privacy: Inputs and results stay in this browser. Conversion runs locally in your browser; review the output before relying on it.

Worked example: encoding the two characters in "Hi"

Type Hi and the tool looks up each letter's position in the ASCII table. Uppercase H sits at code 65 plus 7, since A through H are the 8th letter slot, giving 72. Lowercase i is 97 plus 8, giving 105. The converter therefore returns 72, 105.

The hexadecimal view follows by base conversion. 72 divides as 4 x 16 plus 8, so it writes as 48 in hex. 105 divides as 6 x 16 plus 9, so it writes as 69. The page shows 48 69 (hex), which is exactly the byte pair a text file would store for "Hi".

One sanity check worth knowing: lowercasing always shifts a letter by exactly 32. 105 minus 72 is 33 because H and i are different letters; compare A at 65 and a at 97 and the 32 gap holds. In hex that gap is 20, since 41 plus 20 equals 61.

Limits: what ASCII does not cover

The table only defines codes 0 through 127. Codes 0 to 31 and 127 are control characters with no visible glyph: pressing Enter produces 13 (carriage return) and a tab produces 9, so the converter happily returns numbers for invisible input. Anything pasted beyond that range, such as e-acute at 233 or the euro sign, is not ASCII at all; those are Unicode code points whose byte encoding depends on UTF-8, where e-acute takes two bytes (195, 169) rather than one.

Case and symbols are fixed by the table, so there is no ambiguity to configure, but whitespace is a real input to count: a space is 32, and a trailing space typed by accident silently adds 32 to the output. For text longer than a few characters, remember the numbers are decimal; a hex dump of the same string will look different unless you convert, so pick one base before comparing outputs against documentation.