Where can I find a comprehensive online resource for IPA transcriptions of the "official" pronunciation of German words?
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www.pons.eu has IPA transcriptions and sound clips for words.
For example, for the word Familie that you mentioned, pons.eu says
I think the sound clips are computer generated though, as opposed to being recorded by a native speaker.
Wiktionary has some, and so does the Duden. However, they are usually not present in dictionaries since German almost universally follows a fixed set of rules for pronunciation so there is generally no need to indicate it explicitly (except for loan words).