UUUP Tools

Encoding & Decoding

Punycode and Internationalized Domain Converter

Convert between internationalized domain names (IDN) and Punycode (xn--). Useful for non-ASCII domain lookup, DNS setup, and mail server configuration. Conversion stays in the browser.

Quick switch→URL Encode/Decode
PunycodeIDNDomain
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Use cases

  • Look up or configure the xn-- form of an IDN
  • Compare ASCII domain forms used in DNS and certificates
  • Check how mail systems write internationalized domains

How to use

  1. Enter an internationalized domain or xn-- value
  2. Choose the conversion direction
  3. Copy the result

Example input and output

Domain

中文.com

Punycode

xn--fiq228c.com

FAQ

What is Punycode?

Punycode encodes internationalized domain labels as ASCII (RFC 3492). In DNS it usually appears with an xn-- prefix.

Does it convert hostnames or full URLs?

It processes domain labels: non-ASCII labels encode to xn--, and xn-- labels decode to Unicode. That fits hostnames and multi-level domains.

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