ASCII to Unicode Converter Online
ASCII to Unicode & Decode decimal, hex, octal, or U+XXXX values to Unicode characters - emoji-safe via fromCodePoint. Free, client-side, instant, offline.
Paste numeric code values — decimal, hex, octal, or U+XXXX — and get back the actual Unicode characters. Emoji and astral-plane code points are supported via fromCodePoint.
How to Use ASCII to Unicode Converter Online
- Paste or type your numeric values into the input, separated by spaces, commas, semicolons, or newlines. The tool accepts any mix - you can paste output from almost any encoder.
- Pick the input format: Decimal (default -
72), Hexadecimal (0x48or just48), Octal (110), orU+XXXX(the canonical Unicode-spec notation,U+1F600). - Watch the live preview - decoding repaints within 150 ms of every keystroke. Valid code points render as real characters; emoji and astral-plane code points like U+1F600 (😀) work because the decoder uses
String.fromCodePoint, notfromCharCode. - Read the stats line: format, total tokens, decoded characters, and any skipped count. The counts tell you whether every token landed in the output or something was rejected.
- Check the inline error when validation fails - it names the offending token. Tokens outside 0-0x10FFFF or in the surrogate range 0xD800-0xDFFF are rejected with specific messages instead of silently producing garbage.
- Copy or Download, or press
Ctrl+Enter(⌘+Enteron Mac) to decode and copy in one shortcut. Reset demo restores the starter72 101 108 108 111input so you can experiment without retyping. - Use the output directly - drop it into markdown, UI strings, test fixtures, or anywhere else a Unicode string belongs.
Frequently asked questions
Is my data secure when using this converter?
Yes, absolutely. This tool operates 100% client-side in your browser. No data is uploaded to any server, ensuring complete privacy and security for your conversions.
Is this tool completely free to use?
Yes, this ASCII to Unicode converter is 100% free with no hidden costs, registration requirements, or usage limits. Use it as often as you need for any project.
Does this work offline?
Yes. Once the page loads, you can disconnect from the internet and continue converting. All processing happens locally in your browser.
What’s the difference between ASCII and Unicode?
ASCII is a 7-bit character encoding supporting 128 characters (0-127). Unicode is a comprehensive standard supporting over 140 000 characters from all world languages, including emoji and special symbols.
What input formats are supported?
Four numeric formats: Decimal (72), Hexadecimal (0x48 or bare 48), Octal (110), and the canonical Unicode U+XXXX notation (U+0048). Pick whichever matches your source.
Can I convert Unicode code points to characters?
Yes. That is exactly what the tool does – every token is fed through String.fromCodePoint, so decimal 9733 or hex 0x2605 both render as the star symbol (★), and U+1F600 renders as 😀.
How do I separate multiple values?
Any mix of whitespace, commas, semicolons, or newlines. So 72 101 108 108 111, 72,101,108,108,111, and a vertical list all work identically.
What are common use cases for this tool?
Debugging character-encoding issues, converting HTML entity codes, analysing byte sequences, generating emoji from their documented code points, learning the internals of Unicode, and testing i18n fixtures.
Can I convert emoji using this tool?
Yes. Emoji are Unicode characters – enter their code points in decimal (128512), hex (0x1F600), or U+ form (U+1F600) and the rendered emoji appears. Surrogate-only code points (0xD800-0xDFFF) are rejected with an explicit error because they can’t stand alone.
What happens if I enter an invalid code point?
The decoder validates each token and shows an inline error naming the offending value – for example “Token 0xD800 is in the surrogate range (0xD800-0xDFFF) and cannot stand alone” or “Token -1 is outside 0-0x10FFFF”. Nothing silently turns into garbage.