It can feel a bit concerning to place what is essentially a giant sticker right on the face of your shiny new smartphone. The short answer to this question is no, they won’t ruin your screen. However, some of the more budget-friendly options have the potential to leave a slight residue on your screen when it comes time to replace it with a new one.
The good news here is that glass is super easy to clean (just think of how you can easily clean caked-on bugs off of your car’s windshield after a road trip!) So while it won’t ruin your phone, you may have to take a few extra steps when it comes time to swap it out for a new one.