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A practical reference for learners of German who need to type the umlauted vowels Ä, Ö, Ü and the Eszett (ß) on keyboards that do not carry them. It collects the reliable input methods for Windows, macOS, Linux, ChromeOS, iOS and Android, with Unicode code points, HTML entities and numeric keypad codes, compares the methods for setup cost and typing speed, and gives recommendations for learners and teachers. Companion tool: https://umlautletters.com/
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Hetal Jani (2026) studied this question.
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