Google Translate does not offer Pennsylvania Dutch. This translator asks Google for German, the closest language it does offer, and then rewrites that into Pennsylvania Dutch with a documented set of rules: word swaps, sound changes and grammar. It is a rule-based rewrite, not a human translation, so check anything that matters with a speaker.
36.9 on 64 real sentences; Google's German as is: 26.3.
The score is chrF: how closely the output matches what real Pennsylvania Dutch speakers wrote, character by character, from 0 to 100. Tested on 64 held-out human pairs (Tatoeba and Wiktionary); on the 22 everyday Tatoeba pairs 49.1 vs 25.2, where two human speakers agree at 59.0.
Google's German rewritten into Pennsylvania Dutch (Deitsch, Buffington-Barba spelling) by sound correspondences, a Wiktionary-backed lexicon, and grammar rules for the perfect, du-agreement and the dative possessive.
The rules are a plain file anyone can read, test and copy. Every translation shows Google's German underneath, so you can see exactly what the rules changed.
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