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Punycode Encoder/Decoder

Convert internationalized domain names (IDN) between Unicode and ASCII-compatible Punycode encoding per RFC 3492

Unicode Domain / Text

Punycode Result

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What is Punycode Converter?

Encode and decode internationalized domain names (IDN) between Unicode and Punycode using a pure TypeScript implementation of RFC 3492.

Convert domains with non-ASCII characters like umlauts, Chinese, Japanese, Korean, Arabic, Cyrillic, and emoji into their xn-- ASCII-compatible encoding. Supports full domain names with automatic label splitting, batch mode for multiple domains, and a Unicode codepoint inspector. Domain validation checks length limits and format rules. All processing runs locally in your browser.

How to Use Punycode Converter

1Enter a Unicode domain name or Punycode-encoded domain in the input field
2Select the conversion direction or let the tool auto-detect
3View the converted output instantly with domain validation info
4Use batch mode for converting multiple domains at once

Frequently Asked Questions

What is Punycode?

Punycode is an encoding system defined in RFC 3492 that represents Unicode characters using only ASCII characters. It is used to encode internationalized domain names (IDN) so they can work with the DNS system, which only supports ASCII.

What does the xn-- prefix mean?

The xn-- prefix (called ACE prefix) indicates that a domain label is Punycode-encoded. For example, 'munchen.de' with an umlaut becomes 'xn--mnchen-3ya.de'. The prefix tells DNS resolvers to decode the label.

Does this support emoji domains?

Yes. Emoji characters are Unicode and can be converted to Punycode. However, most domain registrars do not allow emoji domain registrations due to security concerns around visual spoofing.

Is this safe for sensitive domains?

Yes. All conversion happens locally in your browser. No domain names are sent to any server.

How do I tell what a suspicious xn-- link really points to?

Paste the xn-- domain into the decoder and it shows the readable Unicode name. This reveals IDN homograph attacks, where a phishing link uses lookalike characters from another script so that, for example, xn--pple-43d.com renders as apple.com. Decoding shows the actual characters before you click.

Can I convert several domains at once?

Yes. Switch to batch mode and paste a list of domains, one per line. Each line is encoded or decoded independently so you can process a whole set of URLs in a single pass.

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