On the back of a Sainsbury's voucher, it says "the code must be inputted into the checkout page ...". I grimace.
Firstly, the word "input" was originally a noun, not a verb. Secondly, if it is a verb, then the relevant participle is surely just "input" - in the same way that one doesn't say "the food must be putted away." Thirdly, surely the whole point about "input" as a verb is that it implies a level of "in-ness" - so saying "input into" is tautological.
Friends, behold the rise of an illiterate generation. And the rise of a bunch of pedants futilely and ineffectually railing against them.