IDN Punycode Converter

Convert between Unicode domain names and Punycode (ASCII-compatible encoding)

Example Domains

Unicode → Punycode Conversion

Enter Unicode domain names with international characters

Punycode Result

Enter a domain name to see the conversion result

About IDN and Punycode

Internationalized Domain Names (IDN) allow domain names to contain Unicode characters from various scripts and languages. Punycode is the ASCII-compatible encoding that represents Unicode domain labels, allowing non-ASCII domain names to work with existing DNS infrastructure.

How Punycode Works

Each Unicode label is encoded separately:

Unicode: münchen
Encoded: mnchen-3ya
Final: xn--mnchen-3ya
The xn-- prefix identifies punycode labels

Common Use Cases

  • International domain registration
  • Email address internationalization
  • DNS configuration
  • Web application development
  • Security analysis

Supported Features

  • RFC 3492 compliant Punycode encoding/decoding
  • Bidirectional conversion (Unicode ↔ Punycode)
  • Multiple domain labels support
  • Mixed ASCII/Unicode domain handling

Security Considerations

  • Homograph attacks: visually similar characters from different scripts
  • Always validate and normalize IDN input in applications
  • Consider implementing mixed-script detection
  • Be aware of browser IDN display policies