Convert Punycode and Unicode domains

Why domains have an ASCII representation

Internationalized domain names can contain characters outside of the simple ASCII character set. For the technical representation, suitable labels are encoded with xn--. A single domain name can have several coded and uncoded labels. The converter shows both the readable Unicode version and the technical ASCII version, which is used in many DNS and hosting tools.

Domain names instead of full URLs

Enter only the domain name, for example bücher.de. Protocol, path, port, email address and query parameters do not belong in this converter. You can process up to 100 domains line by line. By contrast, the URL encoder/decoder is responsible for percentage encoding of paths or parameters; Punycode and URL encoding solve different tasks.

Normalization and borders

The input is first normalized by the domain processing of the browser and then transferred to both representations. Invalid labels, overlong names or inconclusively convertible Punycode values are rejected. The processing does not check whether the domain is registered or reachable. Different registers may have additional rules for allowed character combinations.

Similar signs remain different domains

A Unicode character can be very similar to a Latin letter and still belong to a different domain. The readable edition is therefore not a proof of trust. For important domains, additionally check the ASCII spelling and its origin. All conversions run locally; there is neither a DNS request nor a call to the entered domain.

Frequent questions