unicode to punycode

Convert internationalized domain names and Unicode text into their ASCII-compatible Punycode representation.

Unicode to Punycode Converter transforms internationalized domain names (IDNs) containing non-ASCII characters into their Punycode equivalents. Punycode is a standardized encoding defined in RFC 3492 that allows Unicode characters to be represented using only ASCII letters, digits, and hyphens — the limited character set supported by the Domain Name System (DNS).

This tool is essential for web developers, network administrators, and domain registrars who work with multilingual domain names. Domains containing characters from scripts like Cyrillic, Arabic, Chinese, or accented Latin letters must be converted to Punycode before they can be registered or resolved by DNS servers worldwide.

For example, the German domain münchen.de becomes xn--mnchen-3ya.de in Punycode. Understanding this conversion is critical for detecting internationalized domain name homograph attacks, where visually similar characters from different scripts are used to impersonate legitimate websites.

All encoding is performed entirely in your browser using a client-side implementation of the Bootstring algorithm. No data leaves your device, making this tool safe for processing sensitive domain names and internal network addresses.