IDN Punnycode converter

Have you ever wondered how some domain names can have non-English characters, such as Chinese, Arabic, or Cyrillic? How do they work on the web, and how can you access them? The answer is punycode, a special encoding method that allows internationalized domain names (IDNs) to be compatible with the ASCII standard. In this page, you will find a free online tool that can convert between punycode and Unicode, and learn how it works and why it is useful.

What is IDN Punycode Converter Tool

An IDN Punycode converter is a tool that allows you to convert IDN domain names between their native language characters and their Punycode representation. IDN domain names are domain names that contain characters from non-Latin scripts, such as Chinese or Arabic.

Punycode is a system for representing non-ASCII characters in ASCII format, using a specific syntax. It is commonly used as a way to represent IDN domain names in a way that can be understood by systems that do not support non-Latin characters.

IDN Punycode converters are commonly used by domain name registrars, web developers, and other professionals who work with IDN domain names on a regular basis. They can be especially useful for registering or managing IDN domain names, or for troubleshooting issues with IDN domain names.

To use an IDN Punycode converter, you simply enter your IDN content that you want to convert into the appropriate field and the tool will generate the corresponding Punycode representation or vice versa. The tool allow you to choose the specific encoding method to use, such as Punycode / ASCII and IDN/ Text.

How to Use the Punycode Converter Tool

The punycode converter tool is a simple and convenient way to encode or decode punycode online. You can use it to convert any Unicode string into punycode, or vice versa.

To use the tool, just follow these steps:

  • Enter your input string in the content box. It can be either punycode, ASCII or IDN/TXT.
  • Select the conversion mode from the Type drop-down menu. You can choose to encode or decode punycode.
  • Click on the Submit button to get the output string.
  • Copy or share the output string as you wish.

Some tips and best practices for using the tool are:

  • Make sure your input string is valid and does not contain any illegal characters.
  • Check the output string for any errors or typos before using it.
  • Use the tool for educational or personal purposes only. Do not use it for malicious or illegal activities.


How Does Punycode Work

Punycode is a form of ASCII-Compatible Encoding (ACE) that encodes Unicode characters into ASCII characters. It is based on a simple algorithm that uses digits, hyphens, and lowercase letters to represent Unicode code points. The algorithm consists of two parts:

  • The basic code points, which are ASCII characters that do not need to be encoded, such as letters, digits, and hyphens. They are copied unchanged to the output string.
  • The extended code points, which are non-ASCII characters that need to be encoded, such as accented letters, symbols, or ideographs. They are encoded using a variable-length sequence of digits and letters, preceded by a hyphen.

The algorithm also adds a special prefix, xn--, to the output string to indicate that it is punycode. For example, the IDN مثال.إختبار  (meaning “example.test” in Arabic) is encoded as xn--mgbh0fb.xn--kgbechtv in punycode.


Punycode decoding is the reverse process of punycode encoding. It takes a punycode string as input and converts it back to Unicode. It removes the prefix xn-- and splits the string into two parts: the basic code points and the extended code points. It then decodes the extended code points using a similar algorithm as encoding, and appends them to the basic code points. For example, the punycode xn--fsqu00a.xn--3lr804h is decoded as 例子.测试 (meaning “example.test” in Chinese) in Unicode.


Punycode is different from other encoding methods, such as UTF-8 or URL encoding, in several ways:

  • Punycode only encodes non-ASCII characters, while UTF-8 encodes all Unicode characters and URL encoding encodes all non-alphanumeric characters.
  • Punycode uses a fixed prefix xn-- to identify itself, while UTF-8 uses a variable-length prefix of one to four bytes and URL encoding uses a percent sign % followed by two hexadecimal digits.
  • Punycode uses a custom algorithm that minimizes the length of the output string, while UTF-8 uses a standard algorithm that preserves the order of the input string and URL encoding uses a simple algorithm that replaces each character with its hexadecimal value.


Benefits of Using Punycode

Using punycode for IDNs has many benefits for both users and webmasters, such as:

  • Supporting multilingualism and diversity on the web. Punycode allows users to register and access domain names in their own languages and scripts, without being limited by ASCII characters. This enhances their cultural identity and expression on the web.
  • Improving user experience and accessibility. Punycode makes it easier for users to type and remember domain names, especially for languages that use complex or non-Latin scripts. It also reduces the risk of confusion or miscommunication due to similar-looking or homoglyphic characters.
  • Enhancing SEO and online visibility. Punycode helps webmasters to optimize their domain names for search engines and target audiences, by using relevant keywords and terms in their own languages. It also increases the chances of ranking higher and getting more traffic for niche or local markets.
  • Avoiding phishing and spoofing attacks. Punycode helps users to identify and verify the authenticity of domain names, by displaying them in their original Unicode form in modern browsers. It also prevents attackers from registering or using fake or misleading domain names that look like legitimate ones.

According to a study by Verisign, the global leader in domain name registration, there were over 10 million IDNs registered as of June 2020, representing 2.5% of the total domain name market. The top 10 languages for IDNs were Chinese, German, Russian, Japanese, French, Spanish, Arabic, Korean, Portuguese, and Turkish. The study also found that IDNs had higher click-through rates and lower bounce rates than ASCII domain names, indicating higher user engagement and satisfaction.


Punycode is a powerful and practical encoding method that enables IDNs to work on the web. It converts Unicode characters into ASCII characters, making them compatible with the DNS system and the web browsers. It also preserves the original appearance and meaning of the domain names, making them more user-friendly and trustworthy.

If you want to use punycode for your own domain name, or just want to learn more about it, you can use our free online punycode converter tool. It can help you to encode or decode punycode easily and quickly. You can also check out other related tools that we have listed below.