You’ve found a spare iPhone 13 screen protector in a drawer, and your iPhone 12 could do with one. Both phones have 6.1-inch displays, both have a notch at the top of the screen, and held side by side the two protectors look practically identical. It is a reasonable assumption that one should fit the other — and it is almost right. Almost, in this case, is the problem.
The iPhone 13 protector will physically stick to the iPhone 12 and cover the display. What it will not do is line up correctly around the notch, the earpiece speaker and the sensors — the one area where Apple changed the design between the two models. Here is exactly what differs, and why the mismatch matters.
Key Takeaways
- The iPhone 12 and iPhone 13 share the same 6.1-inch display size and almost identical front dimensions, which is why their protectors look interchangeable.
- Apple made the iPhone 13’s notch about 20% narrower and moved its earpiece speaker up to the very edge of the frame.
- An iPhone 13 protector on an iPhone 12 can partly cover the wider notch area, muffle the earpiece and leave sensor windows misaligned.
- The protector will adhere and protect the flat part of the screen, so it works as a short-term emergency measure — nothing more.
- Screen protectors are model-specific for a reason, and a correct iPhone 12 protector is cheap. There is no good reason to settle for the wrong one.
Nearly Identical on Paper
Start with the numbers, because they explain the confusion. The iPhone 12 and iPhone 13 both measure 146.7 mm tall and 71.5 mm wide, and both have a 6.1-inch display with the same resolution. The iPhone 13 is a fraction thicker and slightly heavier, but the front face — the part a screen protector cares about — is to all practical purposes the same size and shape. The outer edges of a protector cut for either phone land in almost exactly the same place.
This is also why some budget listings advertise a single protector as fitting both models. Those products exist, and they do stick to both phones. But “sticks to it” is a low bar. A protector is not just an outline — it is an outline plus precisely placed cutouts, and the cutouts are where the two generations part company.
The Notch Is Where It All Goes Wrong
To shrink the notch on the iPhone 13, Apple rearranged the TrueDepth camera system and moved the earpiece speaker out of the notch entirely, tucking it into a slim slot at the very top edge of the frame. The result is a notch that is roughly a fifth narrower than the iPhone 12’s, and slightly deeper front-to-back. On the iPhone 12, the wider notch houses the speaker grille in its centre, lower down and fully inside the notch area.
A protector is laser-cut to match one layout or the other. An iPhone 13 protector has a narrower notch cutout and a speaker slot positioned for the higher, relocated earpiece. Lay it over an iPhone 12 and the opening is simply in the wrong place: too narrow for the 12’s notch, and its speaker slot does not correspond to where the 12’s speaker actually sits.
- Before fitting any protector, hold it over the phone without peeling the backing and check the cutouts against the notch and speaker in good light. If the openings don’t match exactly, don’t fit it — once the adhesive touches the screen, your options narrow considerably.
What Happens If You Fit One Anyway
The glass will adhere across the flat display, and because the outer dimensions match, the edges will sit where they should. Touch response, brightness and image quality are unaffected — glass is glass. The problems are concentrated at the top of the screen. The iPhone 12’s wider notch extends beyond the protector’s narrower cutout, so the protector’s edge and its adhesive border cross over part of the notch zone.
In practice that means the earpiece can sound muffled during calls, because the speaker is partly covered by glass or adhesive. The proximity and ambient light sensors may sit under the protector’s border rather than inside the cutout, which can cause occasional quirks such as the screen behaving oddly when the phone is held to your ear. Face ID usually keeps working, but if the cutout edge clips the camera or flood illuminator, unlocking can become slower or less reliable. None of this damages the phone — it just makes it mildly worse to use, every day.
Does the Reverse Work Any Better?
Fitting an iPhone 12 protector to an iPhone 13 is no better. The cutout is now too wide rather than too narrow, leaving an exposed band of glass around the notch, and the protector’s solid upper border can sit over the iPhone 13’s relocated earpiece slot at the frame’s edge — the speaker Apple moved precisely to free up space. You get the same class of problems, mirrored.
- If your current protector is cracked and a wrong-model spare is genuinely all you have, fitting it for a few days beats leaving the screen bare — the flat part of the display is still protected. Just order the correct one the same day and swap it when it arrives.
The Sensible Verdict
None of this would matter if correct protectors were expensive or hard to find. They are neither. Multi-packs for the iPhone 12 cost a few pounds, include alignment frames, and take minutes to fit. Deliberately fitting a protector whose cutouts don’t match — to save a few pounds and a day’s wait — trades a small saving for muffled calls and sensors in the wrong place, for the entire life of the protector.
So: will an iPhone 13 screen protector fit an iPhone 12? It will go on. It will not fit. Buy the one made for your phone.
Frequently Asked Questions
Will an iPhone 13 screen protector stick to an iPhone 12?
Yes. The front dimensions of the two phones are nearly identical, so the protector adheres normally and covers the flat display area. The fit problem is confined to the notch, speaker and sensor cutouts at the top of the screen.
Can the wrong protector damage my iPhone 12?
No — it won’t harm the phone. The risks are functional niggles: a muffled earpiece, sensor quirks and potentially less reliable Face ID. Peeling it off and fitting the correct protector returns everything to normal.
Are protectors sold as fitting both the iPhone 12 and 13 any good?
They are cut generously to cover both notch designs, which means they fit neither precisely. Some work acceptably, but a protector made specifically for your model will always align better around the notch and sensors.
A few millimetres at the notch is all that separates “fits” from “goes on” — and a screen protector is something you look at and touch a thousand times a day. It’s worth the few pounds to get the one that truly fits.
