What is an IDN domain?

An Internationalized Domain Name (IDN) contains non-ASCII characters such as accented letters, Arabic, Chinese, or emoji. IDNs are encoded to Punycode (starting with xn--) for use in the DNS system.

What does xn-- mean in a domain?

xn-- is the ASCII Compatible Encoding (ACE) prefix that signals a Punycode-encoded domain label. For example, münchen.de becomes xn--mnchen-3ya.de.

IDN Encoder / Decoder - Punycode Domain Names

Using the IDN Encoder / Decoder

Type or paste a domain name containing international characters (e.g. café.com) into the input field.
Adjust any available options shown - the output updates as you type.
The result updates instantly - no submit button required for most operations.
Click Copy or Download to take the output to your next step.

IDN Encoder / Decoder: convert international domain names to Punycode (xn--) and back instantly. This punycode converter handles Unicode domain conversion with high precision, ensuring your internationalized addresses are DNS-compatible. It is an essential xn-- decoder for webmasters and developers working with global audiences who use non-ASCII characters in their URLs.

How This Punycode Converter Works

Our IDN Encoder / Decoder uses standard IDNA protocols to translate between human-readable Unicode and machine-readable Punycode. This idna encoder runs completely in your browser, providing a secure way to manage domain name punycode transformations without external API calls. Whether you are registering a new site or debugging server logs, this free online idn tool delivers immediate, reliable results.

Accepts large inputs - no size limits imposed by this tool
Handles edge cases: empty fields, special characters, and Unicode
Copy-to-clipboard and file download for every output
Works on Chrome, Firefox, Safari, and Edge without any extensions

Frequently Asked Questions

What does idn-encoder do?

idn-encoder convert international domain names to punycode (xn--) and back.

What input does idn-encoder accept?

Paste text directly into the input field, or type your data. Most operations handle Unicode, special characters, and multi-line inputs without issue.

How large an input can I process?

There is no hard limit imposed by this tool. Very large inputs (multi-MB text) process within your browser's available memory. For files larger than 50 MB, a command-line tool may be faster.

Can I download the output?

Yes - every output panel includes a Copy to Clipboard button and a Download as file option. Outputs are saved as plain text or the appropriate file format for the operation.

Make your global web presence more accessible by using this IDN Encoder / Decoder for all your domain name punycode needs.

IDN Encoder / Decoder online

Convert international domain names to Punycode (xn--) and back - runs in your browser