Hostname to Punycode Converter - Free Online Tool
Hostname to Punycode Converter
Convert Any Internationalized Domain to ASCII Punycode
Understanding Internationalized Domain Names
Non-Latin Domains
IDNs let domain names use accented characters, Cyrillic, Chinese, Arabic, and other non-ASCII scripts.
DNS Compatibility
The DNS system only understands ASCII, so every IDN is stored and transmitted internally in its Punycode form.
Debugging & Config
See exactly what ASCII form a browser or DNS resolver actually sends for an international domain.
Client-Side Only
All conversion happens locally in your browser using a full RFC 3492 implementation — no data is ever sent to a server.
What Punycode Actually Encodes
Punycode (RFC 3492) is a way to represent Unicode text using only the limited ASCII character set DNS allows. Each non-ASCII label gets an "xn--" prefix followed by an encoded representation of its special characters — so café.com becomes xn--caf-dma.com, which is what actually gets registered and resolved at the DNS level, even though browsers display the original Unicode form.
Key Takeaways
- Full RFC 3492 Implementation: Implements the real bootstring algorithm, not an approximation.
- Per-Label Encoding: Each dot-separated label is encoded independently, exactly as DNS requires.
- Client-Side Only: All conversion happens locally in your browser — no data is ever sent to a server.