Punycode is an encoding syntax defined in RFC 3492 that translates Unicode characters into ASCII character sequences prefixed with "xn--", allowing non-English domains to work with legacy DNS systems.

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Punycode & IDN Domain Converter

Convert international domain names (IDNs) between Unicode and ASCII Punycode (xn--).

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How to Use Punycode & IDN Domain Converter

Enter an international domain (e.g. münchen.de).
Click "Unicode → Punycode" to see the xn-- domain string.
Or paste a Punycode domain to decode back into Unicode.

Frequently Asked Questions

What is Punycode?: Punycode is an encoding syntax defined in RFC 3492 that translates Unicode characters into ASCII character sequences prefixed with "xn--", allowing non-English domains to work with legacy DNS systems.

Sources & References

Primary references: WHATWG URL Standard; The Unicode Standard.

Review policy: references and behavior notes are checked whenever the tool implementation changes.