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  3. Punycode Converter
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Punycode Converter

Convert internationalized domain names (IDN) between Unicode and Punycode ASCII encoding. Support for non-ASCII domains.

Convert internationalized domain names (IDN) to and from their Punycode representation. If you work with domains containing non-ASCII characters, like umlauts, Chinese characters, or Arabic script, this tool shows you the xn-- encoded form that DNS actually uses.

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Punycode Converter: a worked example

You registered an internationalised domain and need its ASCII (Punycode) form for DNS and TLS certificate config.

Unicode domain

münchen.de
Punycode Converter produces

Punycode (ASCII)

xn--mnchen-3ya.de

DNS only allows ASCII, so Unicode labels are encoded with the `xn--` ACE prefix; "münchen" becomes `mnchen-3ya`, which encodes both the base letters and where the non-ASCII character belongs. Seeing both forms also helps spot homograph phishing, where a lookalike Unicode domain hides a very different Punycode reality.

What is Punycode Converter?

Convert internationalized domain names (IDN) to and from their Punycode representation. If you work with domains containing non-ASCII characters, like umlauts, Chinese characters, or Arabic script, this tool shows you the xn-- encoded form that DNS actually uses.

How to use

  1. 1Enter a Unicode domain name to get its Punycode form.
  2. 2Or paste a Punycode string (starting with xn--) to see the Unicode version.
  3. 3Copy the result.

Key features

  • Unicode to Punycode encoding
  • Punycode to Unicode decoding
  • Handles full domain names with multiple labels
  • Shows the xn-- prefix used in DNS

Examples

  • German domain

    münchen.de encodes to xn--mnchen-3ya.de

  • Chinese domain

    例え.jp encodes to xn--r8jz45g.jp

Frequently asked questions

What is Punycode?

Punycode is an encoding that represents Unicode characters using only the ASCII characters allowed in domain names. It lets internationalized domain names work within the existing DNS infrastructure.

Why do internationalized domains need encoding?

DNS was designed for ASCII only. Punycode bridges the gap by encoding Unicode domains into ASCII-compatible form so they can be resolved by any DNS server.

Private by design

Conversions run on your device in JavaScript. The values you enter are never sent over the network.