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ASCII Converter

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
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.

Summary

ASCII Converter is a free developer utility by Zerethon Tools. Convert characters to ASCII / Unicode codepoints in decimal, hex, binary and octal — or render a live table for any input string. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

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.

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