Punycode and IDN Converter Online

This service converts internationalized domain names (IDN) — Cyrillic, Chinese, Arabic and others — to Punycode (ACE, ASCII Compatible Encoding) format and back. Uses the IDNA2008 (UTS#46) standard.

What is Punycode

Punycode is an algorithm for encoding Unicode strings into ASCII for use in DNS. Domains like пример.рф are converted to xn--e1afmapc.xn--p1acf, which are handled by standard DNS servers.

Use Cases

• Converting IDN domains with non-Latin scripts to ASCII-compatible format;
• Verifying Punycode correctness when configuring DNS;
• Protection against phishing — homograph attacks use similar characters from different alphabets;
• Debugging mail servers and certificates for IDN domains.