Punycode Converter

What Is Punycode Converter?

Punycode encodes Unicode domain labels into ASCII starting with xn-- so internationalized domain names (IDN) work with DNS. This Punycode Converter converts each dot-separated label on every line: Unicode hostnames to Punycode, or Punycode labels back to Unicode—useful for debugging DNS, TLS SANs, and email headers. For extracting contact information from text, check out the Phone Number Extractor and Email Extractor.

Encode vs decode

Encode walks labels left to right; ASCII labels pass through unchanged; labels containing non-ASCII characters become xn--…. Decode reverses labels that start with xn-- and leaves plain ASCII labels as-is.

How to use

1. Pick Unicode → Punycode or Punycode → Unicode.
2. Enter one hostname or label per line (or a single domain).
3. Copy or download the Output column.