I don’t know about online versions/pdf but you can buy the answer key book which has answers for the textbooks and workbooks of both genki 1 and 2 on Amazon
TLDR I am not affiliated in anyway with HeyJapan but they are offering a free year of [Janki](https://apps.apple.com/us/app/study-kanji-n5-n1-janki/id1491115955)…
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I don’t know about online versions/pdf but you can buy the answer key book which has answers for the textbooks and workbooks of both genki 1 and 2 on Amazon