Punycode-Konverter

The internet's domain name system was designed around ASCII characters, but users around the world want to register domains in Arabic, Chinese, Cyrillic, Japanese, and hundreds of other scripts. Punycode is the algorithm that bridges these two worlds, encoding Unicode domain labels into the ASCII-compatible `xn--` prefix format that DNS can handle without modification.

This tool converts human-readable internationalized domain names — like `münchen.de` or `日本語.jp` — to their Punycode equivalents and back. It is useful for web developers implementing IDN support, security researchers investigating homograph attacks, DNS administrators checking zone files, and anyone debugging why an internationalized domain is not resolving as expected.

Punycode online konvertieren

1. 1

   Domainnamen eingeben

   Geben Sie eine Unicode-Domain (z. B. münchen.de) oder eine Punycode-Domain (z. B. xn--mnchen-3ya.de) ein.

2. 2

   Automatische Konvertierung

   Das Tool erkennt den Eingabetyp und konvertiert in die entsprechende Richtung — Unicode zu Punycode oder Punycode zu Unicode.

3. 3

   Ergebnis prüfen

   Verwenden Sie die Ausgabe zur Überprüfung von DNS-Einträgen, Zertifikaten oder E-Mail-Routing. Verarbeitet korrekt Multi-Label-Domains und gemischte ASCII/Nicht-ASCII-Labels.

How Punycode Encoding Works

Punycode (RFC 3492) is a form of bootstring encoding — it encodes a sequence of Unicode code points into a restricted set of ASCII characters. The algorithm first copies all ASCII characters from the input to the output unchanged, then appends a hyphen delimiter, and finally encodes the positions and code points of the non-ASCII characters as a sequence of base-36 digits using a variable-length delta encoding. The result is prefixed with `xn--` to mark it as an ACE (ASCII Compatible Encoding) label.

For a full internationalized domain name, each label (the dot-separated components) is encoded independently. `münchen.de` becomes `mnchen-3ya.de` because only the label `münchen` is internationalized. Security researchers have demonstrated that Punycode makes homograph attacks possible — `аррle.com` using Cyrillic characters looks identical to `apple.com` — which browsers now mitigate by displaying the Punycode form when the label mixes scripts.

Warum den FileCrank Punycode-Konverter verwenden?

• ✓ Wandelt Unicode-Domains in xn--Punycode um und zurück.
• ✓ Verarbeitet Multi-Label-Domains und gemischte ASCII/Nicht-ASCII-Labels.
• ✓ Nützlich zum Erkennen von Homograph-Phishing-Angriffen.
• ✓ Läuft vollständig in Ihrem Browser — keine Daten werden an einen Server gesendet.

Funktionen & Spezifikationen

Max. Dateigröße

Bis zu 100 MB

Datenschutz

DSGVO-konform: Dateien werden nach etwa einer Stunde gelöscht

Preis

Kostenlos, keine Registrierung

Verarbeitung

100% clientseitig

Häufig gestellte Fragen

Punycode Converter vs. Browser Address Bar vs. dig

Modern browsers convert IDNs automatically and can display either the Unicode or Punycode form, but they do not expose the intermediate encoding steps. The `dig` command resolves domain names but does not perform Punycode encoding itself. A dedicated Punycode converter is the right tool when you need to inspect the encoding explicitly — for DNS zone file authoring, IDN debugging, security research into homograph attacks, or verifying that a non-ASCII domain name will resolve correctly.

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