Which privacy filter should I get for my laptop?

Laptop privacy filters are sized and fitted differently from phone protectors, and both differences cause more returns than the privacy performance itself.

Measure the panel, not the diagonal

Two fourteen-inch laptops can have different bezel geometry and different aspect ratios, and a filter cut for one won't fit the other.

Measure the visible panel itself, width and height in millimetres, not the diagonal, or buy one listed for your exact machine by model name. Diagonal size alone isn't enough information, and this is the single most common sizing error in the category.

Aspect ratio matters particularly. Many current laptops use 16:10 or 3:2 panels rather than 16:9, and a 16:9 filter on a 16:10 screen leaves a strip uncovered or overhangs the bezel.

Attachment method matters more than people expect

Adhesive filters are thin and permanent. Magnetic and slide-in filters attach with tabs or a magnetic frame and come off in seconds.

Given that a privacy filter makes it impossible to show your screen to anyone beside you and dims the display for you as well, removability is worth paying for. If you present, pair-program, or ever show a colleague a document, buy magnetic.

The exception is a machine used exclusively for confidential work, where permanence is the point.

Expect a real brightness cost

The louvre layer blocks a substantial proportion of the light heading towards you as well as towards your neighbour. You'll run the backlight higher, which costs battery life, and on an already-dim panel the result can be genuinely unpleasant.

Check your laptop's brightness before buying. On a bright modern panel there's headroom; on an older or budget machine there may not be.

The common mis-purchase

A significant number of people buy privacy filters when what they actually want is anti-glare. If your complaint is reflections from a window or overhead lighting not people reading your screen, buy a matte anti-glare filter instead — it's cheaper, lighter, and doesn't dim the display at all.

The two are easy to confuse because both are sold as screen filters and both reduce what you can see from an angle.

Webcam and touch considerations

Check the filter doesn't cover the webcam or the ambient light sensor, both of which usually sit in the top bezel. Better filters are cut around them.

On a touchscreen laptop, confirm the filter is rated for touch. Thicker privacy layers can reduce responsiveness, and not all filters are designed for touch panels.