Punycode Converter

The Punycode Converter is a browser-based utility for converting internationalized domain names between readable Unicode labels and their ASCII punycode representation. Domains that include non-ASCII characters such as Japanese, German umlauts, or accented Latin letters cannot be stored directly at the DNS wire level, so they are encoded into labels that begin with xn--. In practice, administrators, developers, and support teams often need to move between the human-readable form and the encoded form when checking registrar settings, CDN rules, redirect definitions, certificates, reverse proxies, or debugging URL behavior.

This tool lets you paste a Unicode host name and turn it into its punycode equivalent, or decode an xn-- label back into readable text for inspection. Because the conversion is handled label by label, it is useful for host names that mix ASCII and internationalized segments. You can also enter complete URLs such as https://example.com/path directly; the tool automatically extracts the domain portion, converts it, and rebuilds the URL with paths and query strings preserved.

For bulk operations, simply paste multiple domain names or host names with line breaks. The tool will convert each one separately and display results side by side, making it ideal for validating registrar settings, certificate configurations, or DNS migration tasks. Everything runs locally in the browser, ensuring that host names and investigation notes are never sent to external servers.