Punycode (IDN) Converter

The Punycode Converter tool helps you easily convert between Unicode domain names (containing non-ASCII characters like Arabic, Chinese, or Vietnamese) and the ASCII-compatible format (Punycode).

This is an essential tool for web developers, system administrators, and international domain managers.

Key features

  • International Domain Registration Domain registrars require Punycode to process domain names containing special Unicode characters.
  • DNS Server Configuration System administrators must convert IDNs to Punycode in order to set up DNS records properly.
  • Compatibility Testing Verify that your Unicode domain name works correctly across all legacy network systems.
  • SEO Optimization Ensure your domain name is encoded accurately when sending requests to search engines.

How to use the Punycode Converter

A step-by-step guide to converting Punycode.

  1. Enter data Paste your Unicode domain name or Punycode string (starting with xn--) into the input field.
  2. Select conversion mode The tool supports both "Unicode to Punycode" and "Punycode to Unicode".
  3. Click Convert The system will instantly process and convert your entire text right in the browser.
  4. Copy the result Click the Copy button to copy the encoded or decoded result to your clipboard.

Usage tips

  • All valid Punycode domain names must begin with the "xn--" prefix.
  • Punycode is case-insensitive. For example, "việt.vn" will be encoded to "xn--vit-6o5a.vn".

Frequently asked questions

Punycode is an international standard (RFC 3492) for representing Unicode domains using ASCII characters. Since the original DNS system only supports English characters, Punycode acts as a bridge to encode multilingual characters into a compatible format.
All Punycode-encoded domain names begin with the unique "xn--" prefix. For example, the domain "中国.cn" translates to "xn--fiqs8s.cn".
Yes, our tool supports 2-way conversion. You just need to enter a string starting with "xn--" and hit decode, and it will restore the original characters.
The Bootstring algorithm compresses Unicode characters into ASCII, and also appends the "xn--" prefix. Since each Unicode character can take 1 to 4 bytes, the resulting ASCII string will always be longer than the visual characters.