Punycode Converter

What is This Tool?

Punycode Converter is a free browser-based tool that lets you convert internationalized domain names (IDN) between Unicode and Punycode (xn--) representation. It processes everything locally in your browser using JavaScript, so your data never leaves your device. No sign-up, no installation, and no server uploads required — just open the tool and start using it immediately.

How to Use This Tool

1. Choose your operation mode — encode or decode.
2. Paste or type your input text in the source field.
3. The converted result appears instantly in the output field.
4. Copy the result for use in your code, API requests, or documents.

When to Use This Tool

This tool is particularly useful when registering international domain names, debugging DNS issues with non-ASCII characters, or understanding URL encoding. Since it runs entirely in your browser, it works offline after the page loads and keeps your data completely private. Whether you are a developer, designer, student, or professional, this networking tool saves time and eliminates the need for desktop software installation.

Tips and Best Practices

• Encoding is NOT encryption — encoded data can be decoded by anyone. Never use encoding to protect sensitive information.
• UTF-8 characters, emojis, and special symbols are fully supported in both encoding and decoding.
• When decoding, ensure the input is complete — partial or corrupted encoded strings may produce unexpected results.
• Check for unwanted whitespace or line breaks that may have been introduced during copy-paste operations.
• Processing is entirely local — your data never leaves your browser.