Encoding & Number Bases
Punycode (IDN) Converter
Convert international domain names to/from Punycode (xn--) ASCII form.
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What is Punycode?
Punycode enables Unicode domain names in the ASCII-only DNS system. This converter uses the Punycode algorithm (RFC 3492).
How it works
We parse the domain into labels, apply Punycode encoding/decoding per label, and reassemble with the ACE prefix (xn--) for encoded labels.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.