Convert Unicode to Punycode
Encode Unicode text to Punycode encoding. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Convert Unicode to Punycode
- 1. Paste the internationalized text. Paste the Unicode text you want encoded as Punycode, typically an internationalized domain name label or a single word containing non-ASCII letters.
- 2. See how the RFC 3492 algorithm applies. The tool applies the RFC 3492 Punycode algorithm, separating the ASCII characters from the non-ASCII ones and appending an encoded suffix that lets the original string be reconstructed exactly.
- 3. Copy the Punycode result. Copy the Punycode result, prefix it with xn-- if you are building a full IDN label, and use it anywhere DNS or an ASCII-only system needs to represent the domain name.
When to use Convert Unicode to Punycode
Convert Unicode to Punycode encodes internationalized text into the ASCII-compatible form DNS requires for domain names. It is for anyone registering or debugging a domain that contains accented letters, non-Latin scripts, or other characters outside the ASCII range.
- Registering an internationalized domain name. You want to register münchen.de or a domain in another script, and need the Punycode label starting with xn-- that the registrar's system and DNS actually store.
- Debugging a suspicious-looking URL. A link shows an xn-- prefixed domain in the address bar, and decoding it here confirms whether the underlying Unicode domain matches the brand it claims to be, catching a homograph phishing attempt.
- Configuring a mail server for IDN addresses. An email system needs to route mail to an address at an internationalized domain, and the mail server configuration requires the domain in its Punycode form rather than raw Unicode.
- Testing IDN support in an application. You are verifying that your application correctly handles internationalized domains by comparing its internal Punycode conversion against a known-correct reference value.
Examples
Punycode
Input
münchen
Output
mnchen-3ya
About the Convert Unicode to Punycode tool
Convert Unicode to Punycode is a free online tool that works entirely inside your web browser. Encode Unicode text to Punycode encoding. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 98 Unicode utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
There is nothing to configure. Provide the input and the result appears on its own. A worked example further down the page shows exactly what the tool produces for a real input.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Does Convert Unicode to Punycode cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.