Internationalized domain names are great for users, but developers still need to reason about their ASCII-compatible Punycode form in registrars, DNS tools, and certificates. A dedicated converter makes IDN debugging much less error-prone.
What Is the Punycode Converter?
Punycode Converter is one of the tools in WebdevToolbox’s Encoding & Decoding category. Convert internationalized domain names (IDN) to and from Punycode (ACE). It runs entirely in your browser — no server uploads, no accounts, no waiting.
How to Use It
- Open the tool at /tools/punycode.
- Paste a Unicode domain to convert it to Punycode, or switch directions to decode an xn– label back into readable text.
- The result updates live as you work, so you can immediately inspect the encoded or decoded output.
- Use the Copy button to copy the result to your clipboard.
Key Features
- 100% client-side — all processing happens in your browser, so your input never leaves the page.
- Live conversion — results update instantly as you type, paste, or switch modes.
- One-click copy — copy the encoded or decoded output with a single click.
- Unicode and ACE conversion — translate domain labels to and from the xn– format used by DNS and registrars.
- IDN troubleshooting — useful for checking exactly how browsers, APIs, and certificate tooling represent the same domain.
When to Use the Punycode Converter
- Domain validation — verify how an internationalized hostname should be stored or transmitted in backend systems.
- DNS and certificate debugging — compare Unicode domains with their Punycode labels when resolving setup issues.
- Form testing — confirm that user-entered IDNs round-trip correctly through validation and storage logic.
Try It Now
Try Punycode Converter the next time you need a fast browser-based converter for development, debugging, or testing.
Part of the Encoding & Decoding collection on WebdevToolbox — free, browser-based developer tools with no login required.