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Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

Punycode Converter

Convert international domain names to Punycode.

FreeRuns in browserpunycode converteridn converter

Converts internationalized domain names to ASCII-compatible encoding.

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Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About Punycode Converter

Convert international domain names to Punycode encoding online for free. Translate Unicode characters in IDN domains to ASCII-compatible format instantly. Implements standard encoding and decoding algorithms that produce output compatible with all major programming languages and platforms. Supports both encoding and decoding in a single interface. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: URL Encode / Decode, Base64 Encode / Decode, Hex Encoder/Decoder

How to Use Punycode Converter

  1. Enter text or data in the input field.
  2. Click Encode or Decode depending on your goal.
  3. Copy the output to your clipboard.

Frequently Asked Questions

What is Punycode Converter?
Convert international domain names to Punycode encoding online for free. Translate Unicode characters in IDN domains to ASCII-compatible format instantly.
What encoding standards are used?
This tool follows the official encoding specifications, including RFC standards where applicable. The implementation matches widely-used libraries so the output is compatible with other systems and programming languages.
Can I encode binary data?
The tool primarily handles text input, but many encoding formats such as Base64 are designed to represent binary data as text. You can paste Base64-encoded binary data for decoding or encode text into a binary-safe format.
Is the encoding reversible?
Yes, all encoding operations provided by this tool are fully reversible. You can encode text and then decode it back to get the exact original content without any data loss.
Is Punycode Converter free to use?
Yes, encoding and decoding are completely free with no usage limits. The tool runs in your browser and requires no registration.
Is my data safe when using Punycode Converter?
Yes, all encoding and decoding happens locally in your browser. No data leaves your device, so your input remains completely private.

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URL Encode / Decode
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Hex Encoder/Decoder
Encode text to hexadecimal and decode hex to text.