Face ID works normally through privacy glass, so the real cost is a dimmer screen. Pick a two-way filter for normal portrait use, match your exact model, and expect to turn brightness up a notch outdoors.
What changes on an iPhone
| Feature | Effect | Why |
|---|---|---|
| Face ID | Unaffected | The sensors look through the top of the glass, not the privacy filter's angle |
| Brightness | Dimmer | You'll likely raise brightness, which uses more battery |
| Auto-brightness | Slightly off | The light sensor sits under the glass, so readings can shift; adjust manually if the screen seems too dark |
| Always-On display | Hard to read at an angle | Glancing at a phone lying on a desk shows much less |
| Screenshots and recordings | Unaffected | The filter is physical; captures look normal |
Two-way or four-way on an iPhone?
A two-way filter blurs the screen for people beside you and stays clear when you tilt the phone towards yourself. It suits most iPhone use. A four-way filter also blocks views from above and below, which helps in landscape but makes the screen darker and harder to read lying flat. Most iPhone owners should choose two-way.
Pro Max owners
On a 6.9-inch screen, privacy filters show more obvious uneven dimming towards the corners. If you mainly want privacy for messages, a smaller phone or occasional use of the built-in dim settings may suit you better. See privacy protector too dark for settings that help.
Matching the model
The same fit rules apply as for clear glass: 18 Pro and 17 Pro share privacy glass when listed for both, as do the 18 Pro Max and 17 Pro Max.
Questions people ask
Does a privacy screen protector affect Face ID?
No. Face ID works normally through privacy glass on iPhone.
Why is my iPhone so dark with a privacy protector?
The filter blocks some light even straight on. Raise brightness, turn off Reduce White Point if it's on, and consider a two-way filter instead of four-way.