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Punycode Encode online, free
Convert internationalized domain names (IDN) to ASCII Punycode and back.
- Runs in your browser — no upload
- Free, no sign-up, no watermark
- TXT
Set up on this page
- Conversion Mode: encode
How to use Punycode (IDN) Converter · Punycode (IDN) Converter — frequently asked questions
How to use Punycode Encode
- 1
Add your file
Drop a file on the page or click Select Files.
- 2
Check the preset
Conversion Mode is set to encode. You can change it before running.
- 3
Run the tool
Press start. Processing happens on your device.
- 4
Save the result
The result is delivered as JSON, TXT.
What Punycode (IDN) Converter can do
- Conversion Mode: auto, encode and decode
- Private by design — files are processed in your browser and never uploaded
- Free with no sign-up, no watermark and no daily limit
Punycode (IDN) Converter — frequently asked questions
What does this page set for Punycode Encode?
Conversion Mode: encode. All of these stay editable.
Is my file uploaded?
No. On the web this tool runs in your browser, so your file is not uploaded.
Are there limits?
It takes one input per run. Server jobs accept up to 0 GB. A job can run for up to 15 seconds. In the browser, the practical limit is your device's memory.
What is Punycode?
Punycode is an encoding syntax defined in RFC 3492 that translates non-ASCII Internationalized Domain Names (IDNs) into ASCII-compatible strings starting with `xn--`.
Why is Punycode needed?
The legacy Domain Name System (DNS) historically only permitted standard ASCII alphanumeric characters and hyphens. Punycode allows domain names in languages like Hindi, Arabic, Chinese, or German to function globally.
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