Screen protectors spark a lot of debate: some people swear by them, others say modern phone glass does not need one. The honest answer is that they work — for the jobs they are designed to do. Here is what a screen protector can and cannot prevent, and how to choose one.
What a Screen Protector Actually Prevents
The two most common kinds of screen damage are scratches (from keys, sand, and grit) and cracks from face-down drops. A good tempered-glass protector handles both: its hard surface resists scratching, and it is designed to absorb and distribute impact so the protector takes the hit instead of your display. When one does crack, you replace a cheap sheet of glass rather than an expensive screen.
Tempered Glass vs Plastic Film
Plastic film (TPU or PET) is thin, cheap, and flexible — good for scratch resistance and curved edges, but it offers little impact protection and can feel slightly rubbery. Tempered glass is a thin (usually 0.3 mm) sheet of chemically strengthened glass rated around 9H hardness, which resists scratches from most everyday objects and adds real drop protection. For most people, tempered glass is the better everyday choice; film makes sense on curved or foldable screens where glass cannot flex.
What "9H Hardness" Means
9H refers to the pencil-hardness scale used to rate scratch resistance — 9H is the top pencil grade, meaning the surface resists scratching from hard points that would mark softer coatings. Keys (around 4–5H) and sand should not scratch a quality 9H glass. Note that 9H is a scratch measure, not a drop-force measure; drop protection comes from the glass's ability to flex and shatter on impact so your screen does not.
Privacy and Camera Protectors
Screen protectors do more than guard against damage. A privacy protector uses a micro-louver filter so the screen looks black from side angles — useful on planes, trains, and in open offices. Browse the Privacy Screen Protectors collection. Meanwhile a camera lens protector guards the increasingly expensive rear lenses; see the Camera Screen Protectors collection.
Protectors are made for nearly every phone — from the latest flagships to models like the Moto Z Play. A multi-pack such as the iPhone 12 Pro Max 4-Pack means you always have a spare.
How to Install One Bubble-Free
Clean the screen with the included alcohol wipe, then remove dust with the sticky strip — dust, not bubbles, is the usual culprit. Align the protector using the guide frame if one is included, lower it from one edge, and let it self-adhere. Push any small bubbles gently toward the nearest edge with a microfiber cloth. Most air pockets disappear within 24 hours.
Frequently Asked Questions
Do screen protectors really stop cracks? They significantly reduce screen cracks from scratches and many face-down drops by taking the impact themselves. No protector can guarantee protection from every high-force drop, but they meaningfully lower the odds and cost of damage.
How thick is a tempered-glass protector? Typically 0.3 mm, thin enough to keep touch sensitivity and stay under most cases with a raised lip.
What is 9H hardness? The top grade on the pencil-hardness scratch scale. It means the glass resists scratches from hard everyday objects like keys and coins.
Will a screen protector affect touch or fingerprint sensors? Quality glass keeps full touch sensitivity, and most are compatible with in-display fingerprint readers — check the listing for "fingerprint sensor compatible" if your phone uses one.
Glass or film for a curved or foldable screen? Use flexible film on curved and foldable displays, since rigid glass cannot follow the curve or fold. Flat screens are best served by tempered glass.