Punycode Encoding and Decoding

📖 Description

1. Why Do You Need a Punycode Tool?

The underlying architecture of the Internet's Domain Name System originally only supported basic ASCII characters. To allow global users to access websites in their native languages, Punycode was developed:

• Essential for Domain Registration: When you register or configure a domain like 中文.com, the backend DNS records must use the corresponding Punycode format (e.g., xn--fiq228c.com).
• Email System Compatibility: Many legacy mail servers cannot handle non-ASCII encoded addresses. Punycode conversion ensures accurate email delivery.
• Security Auditing (Anti-Phishing): Security experts use this tool to analyze Homograph Attacks. For example, a domain that looks like apple.com might actually be a Punycode-escaped domain using Cyrillic characters.
• Developer Debugging: Assists programmers in validating logic for special character encoding in web crawlers and URL parsing libraries.

2. Core Features Explained

This site provides a precise conversion engine compliant with the RFC 3492 standard:

A. One-Click Domain Conversion (Encoding)

• Smart Recognition: Input a complete domain like 测试.网址, and the tool will automatically preserve the dot (.), applying Punycode encoding only to each label.
• Prefix Completion: Automatically adds the standard xn-- prefix to non-ASCII labels, conforming to IDNA (Internationalized Domain Names in Applications) specifications.

B. Reverse Decoding to Original Text (Decoding)

• Instant Restoration: Instantly revert hard-to-read xn-- strings back to intuitive native language text (e.g., Chinese, Japanese, German umlauts).

C. Absolute Privacy: Browser-Side Computation

• Local Processing: All character conversion logic is performed entirely within your browser's frontend.
• Zero Data Upload: The domains or internal addresses you input are never uploaded to any server. Whether researching competitor domains or debugging internal test environments, your privacy is 100% guaranteed.

3. Conversion Examples

4. Brief Operation Guide

1. Input Content: Enter your multilingual domain (e.g., 工具.com) or Punycode string (e.g., xn--fsq.com) into the left input box.
2. Click Convert:
   • Click "Encode (To Punycode)": Converts text to xn-- format.
   • Click "Decode (To Unicode)": Reverts xn-- format back to text.
3. Instant Result: The conversion result appears instantly in the right output box.
4. One-Click Copy: Copy the result and paste it directly into your domain management panel (e.g., Alibaba Cloud, Cloudflare) or code configuration files.

5. Why Choose This Punycode Assistant?

• Standards Compliant: Strictly adheres to international domain name standards. Conversion results are identical to those in mainstream browsers (Chrome, Safari) and domain registrars.
• Emoji Support: Perfectly handles conversion for emoji domains, meeting the special needs of innovative website owners.
• Extremely Lightweight: Clean, distraction-free interface with second-level loading. An essential tool for daily website administration.
• Completely Free: No registration required, unlimited usage, optimized for both PC and mobile operation.

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