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ASCII Converter — Characters to Decimal, Hex, Binary & Octal

Convert characters to ASCII / Unicode codepoints in decimal, hex, binary and octal — or render a live table for any input string.

Free No signup Client-side Privacy friendly Updated
Decimal
Hex
Binary
Octal
Unicode
In ASCII range?

Character
Decimal
Hex
Binary
Octal
Unicode
UTF-16 units

Showing the first characters.

# Char Dec Hex Bin Oct

How to use

  1. 1 Pick a mode — Char → Code, Code → Char, or Live table.
  2. 2 In Code → Char, prefix with 0x (hex), 0b (binary) or 0o (octal) to enter any base.
  3. 3 Live table shows each character of a string with its code in four bases.
  4. 4 Click any value to copy via your browser shortcut.

Why use this tool

  • Three modes — single character, single code, or a per-character table.
  • Handles full Unicode — including astral-plane emoji via codepoints up to U+10FFFF.
  • Code input auto-detects the base via 0b / 0o / 0x prefixes.
  • Pure browser, zero dependencies.

Frequently asked questions

Is this ASCII-only?

No — the underlying engine handles any Unicode codepoint up to U+10FFFF. The "ASCII range" badge on each row tells you which characters fit in the original 7-bit ASCII set (≤ 127).

What are UTF-16 units?

JavaScript stores strings in UTF-16. Characters above U+FFFF take two 16-bit units (a surrogate pair). The UTF-16 units row shows those raw 16-bit codes.

Why is the live table capped at 200 characters?

Rendering one DOM row per character gets expensive on long pastes. 200 covers the vast majority of inspections — for bigger jobs, run the input through your editor instead.

Need raw bytes instead of codepoints?

Use our String to Hex Converter for UTF-8 byte output, or the UTF-8 Converter for codepoint and \u{HEX} escapes.

What is ASCII Converter?

An ASCII Converter is a tool that converts characters to their ASCII or Unicode code points in decimal, hexadecimal, binary, and octal, and converts code points back to characters. It can also render a live table mapping each character of an input string to its code-point values. The conversion runs entirely in the browser.

Features

Char ↔ code point

Convert characters to decimal/hex/binary/octal code points and reverse it.

Live per-char table

Break a whole string into a table of each character and its code-point values.

100% private

Runs client-side — your input never leaves the browser.

Example

Input

ABC

Output

A = 65 (0x41)
B = 66 (0x42)
C = 67 (0x43)

Common use cases

  1. 1

    Look up a character code

    Find the decimal or hex code point for a character (e.g. newline, tab, ©).

  2. 2

    Debug control characters

    Reveal invisible characters (CR, LF, non-breaking space) hiding in a string.

  3. 3

    Learn ASCII vs Unicode

    See where 7-bit ASCII ends (127) and Unicode code points continue.

Summary

Zerethon's ASCII converter maps characters to their ASCII/Unicode code points in decimal, hex, binary, and octal — and back — in your browser. It can render a live per-character table for any string. ASCII covers code points 0–127 (RFC 20); beyond that it reports Unicode code points. Nothing is uploaded.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. ASCII Converter runs entirely client-side — no server upload, no logging, no tracking of your input.

Compare

Binary vs Hexadecimal

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