Is it "to put something in the fridge" or "to put something into the fridge"?
Thank you.
It depends. What is the complete sentence and context?
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'in' so frequently substitutes for 'into' that you can usually safely use either one with 'put'. I don't think I ever say that I put something into the fridge. I always say 'in'.
According to Google Ngrams "put it in the fridge" occurs about 12 times more often than "put it into the fridge".
CJ