Free browser tool

Punycode converter

Convert internationalized domain names between Unicode and Punycode.

Input and settings

How to use it

Convert an internationalized domain name containing non-ASCII characters into the ASCII hostname form browsers use for DNS.

Enter a domain such as 例え.テスト.
Select Convert.
Review the ASCII hostname output and save it if needed.

Input: Domain/hostname text
Unicode input: Converted to ASCII/Punycode hostname form
ASCII input: Normalized as a hostname and usually remains ASCII
Output: Hostname only; no path or protocol

A Japanese IDN becomes an xn-- hostname

A Unicode hostname such as 例え.テスト is converted to the DNS-safe ASCII hostname form.

The current tool is primarily Unicode-IDN → ASCII hostname normalization. It does not provide a dedicated reverse “xn-- → Unicode display” decoder.

Punycode lets DNS represent non-ASCII labels

Internationalized labels are encoded into ASCII-compatible labels that typically begin with xn--.

This tool converts Unicode domains to their ASCII hostname form

Enter the hostname itself, such as an internationalized domain name. The result is the ASCII/Punycode representation used for DNS-style hostnames; this page is not a dedicated reverse converter back to a Unicode display name.

ASCII hostnames are not expanded into a Unicode display form

An existing xn-- hostname is accepted as ASCII and generally returned in its ASCII form.

This does not validate domain ownership or registration

A syntactically normalized hostname may not exist in DNS and may not be registrable. The converter only handles representation.