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Punycode and IDN Converter

Unicode hostnames to xn-- labels and back, with homograph warnings.
Unicode → ASCIIASCII → UnicodeClearHostname

RFC 3492 punycode per label; non-ASCII labels get xn-- prefixes, ASCII labels pass through.
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Next door in Encoding

- URL encoder (/encoding/url-encoder)
- HTML Entities (/encoding/html-entities)
All encoding tools (/encoding)

Canonical HTML: https://nutter.tools/encoding/punycode
Markdown version: https://nutter.tools/encoding/punycode/index.md
Plain-text version: https://nutter.tools/encoding/punycode/index.txt
Agent index: https://nutter.tools/llms.txt