IDN Toolbox

Punycode conversion, homograph detection, script analysis and domain normalisation for internationalised domain names.

Punycode Converter
Unicode ↔ ACE
Enter a Unicode domain (e.g. münchen.de) or ACE label (e.g. xn--mnchen-3ya.de)
Homograph Detector
Lookalike Check
Enter a domain to check for homograph / lookalike characters
Script Analyser
Unicode Breakdown
Enter any domain or string to inspect its Unicode scripts and codepoints
Domain Normaliser
IDNA 2008 / UTS46
Strips scheme/path, lowercases, applies NFC normalisation, outputs ACE and Unicode forms