A laptop goes to more places than any other computer: the train, the café, the office, the sofa and the bottom of a bag. That brings two kinds of risk. One is privacy: people reading your screen over your shoulder, or a camera you forgot was there. The other is wear and loss: scratches on the lid, a shiny trackpad, dust in the ports and, at worst, a laptop that walks off a desk. This guide covers the small things that deal with both: privacy filters, screen protectors, skins, cable locks, webcam covers and port plugs, what each really does, and what to check before you fit one.
Privacy filters and how they work
A laptop privacy filter is a thin sheet that sits over the screen and makes it look dark to anyone not sitting in front of it. You see your screen normally; the person beside you on the train sees a dark panel.
How they work
Inside the filter is a layer of tiny slats, far too small to see, set side by side like a very fine window blind. Light from the screen that travels straight out passes between the slats. Light that leaves at an angle hits the slats and is blocked. So the screen can only be seen from a narrow range of angles in front of it, and from the side it fades to dark. Most filters work from side to side only, which covers the person next to you. Some also darken the screen from above and below.
What to expect
- A slightly dimmer screen. Because the slats block some light even straight on, most people turn the brightness up a little.
- A narrower sweet spot for you too. If you lean well to one side, your own screen dims. Sitting square in front of it is the way to use one.
- Less use for showing others. If you often turn the screen to show a colleague, choose a filter that comes off easily.
A filter is not a security measure on its own. It stops casual reading from the side; it does nothing about someone standing directly behind you. On a train or in a waiting room, sit with your back to a wall where you can.
Laptops with a privacy screen built in
Some business laptops have a privacy mode built into the screen itself, switched on and off with a key or a setting, which does the same job without a separate filter. If you are choosing a new laptop and privacy matters a great deal, it is worth looking for. For a laptop you already have, a filter is the way to add it.
Choosing the right size
Filters are made to a screen size, measured corner to corner across the screen, and to its shape. Two laptops with the same size number can have differently shaped screens: some are wider and shorter, others taller. A filter for the wrong shape will leave a gap at the top or the sides. Find your laptop's exact model and look for a filter made for it, or measure the visible screen area, width and height, and compare. The shop by screen size ranges, such as 13-inch laptops, gather filters and protectors by size.
How they fix on
- Small adhesive tabs or clips on the screen frame, which hold the filter in place and let it slide out.
- Magnetic filters, made for laptops with magnets around the screen, which attach and come off in a second.
- Stick-on films, which stay on permanently and add privacy all the time.
Removable filters suit people who need privacy only some of the time. If you have a MacBook, read the part on webcam covers below before fitting anything to the screen frame that could be caught when the lid shuts.
Anti-glare and blue-light screen protectors
Laptop screen protectors are thin films over the screen. They do three different jobs, and it helps to know which you want.
Scratch protection
A clear film takes the scratches instead of the screen. Laptop screens are less exposed than phone screens, but they still pick up marks from the keyboard when the lid is closed with crumbs or grit on the keys, and from being cleaned with the wrong cloth.
Anti-glare films
Many laptop screens are glossy, and in a bright room or near a window they act like a mirror. An anti-glare film has a matte surface that scatters reflections, so windows and lights blur rather than show as sharp images. The trade-off is a very slight haze or sparkle over the picture, which some people notice on sharp screens and others never see.
It is worth trying the free fixes first. The HSE's guidance on display screens says it is often easiest if the screen is not directly facing windows or bright lights, suggests blinds and curtains and adjusting the screen's brightness and contrast, and treats anti-glare filters as a last resort when those measures do not solve the problem. Moving the laptop a quarter turn on the table often removes a reflection completely. If it does not, an anti-glare film is a simple next step.
Blue-light films
Some screen protectors are sold as blue-light filters. They tint the screen slightly warmer by holding back some of the blue part of its light. It is worth being clear about what the evidence says. The College of Optometrists, the professional body for optometrists in the UK, says the best scientific evidence available does not support the use of blue-blocking spectacle lenses in the general population, whether to improve vision, to ease eye fatigue or discomfort, or for sleep. In 2023 it reported on a large review which found that blue-light filtering spectacles were no better than ordinary ones at reducing eye strain from computer use. Its statement is about spectacle lenses rather than screen films, and it makes no case for screen films either.
So treat a blue-light film as a tint you may simply prefer the look of, not a treatment. Both main laptop systems already have a free setting that warms the screen's colours. On a Mac it is Night Shift, in System Settings, then Displays, and it can turn on automatically after dark. On Windows it is Night light, in Settings, then System, then Display, with a strength slider and a schedule. Try the setting first; if you like the effect and want it all the time without thinking about it, a tinted film does the same job permanently.
For comfortable eyes, what the HSE suggests for screen work in general helps more: the screen at a comfortable height and distance, no glare, and short, frequent breaks away from it. The guide to setting up a laptop desk covers those.
Fitting a screen film
Clean the screen first with a soft cloth made for screens, such as those in screen sprays and cloths, work in a room without dust in the air, and line the film up along one edge before smoothing it across. Leave a small gap at the edges so the film does not catch when the lid closes. Some films are held by static rather than glue and can be lifted and refitted. The guide to cleaning a laptop safely explains what is safe to use on a screen.
Skins and trackpad protectors
Skins
Laptop skins are thin vinyl stickers cut to fit the lid, and sometimes the area around the keyboard and the base. They do two things: they change the look of the laptop, with colours, patterns, wood or stone effects and textures, and they protect the finish underneath from scratches and scuffs. A skin is much thinner than a hard-shell case, so it adds no bulk, but it protects only against surface marks, not knocks.
What to check:
- The exact model. Skins are cut to the shape of the lid and the position of the logo, ports and vents. A skin for a different model will not line up.
- Vents left clear. A skin must never cover the laptop's air vents. Laptops draw air in and push warm air out through those openings, and a blocked vent makes the laptop run hotter.
- Removal. Good skins use an adhesive designed to peel off cleanly. Cheap ones can leave a sticky film behind, especially after months in the sun. Peel slowly and warm the skin gently if it resists.
- Labels underneath. A skin on the base can cover the serial number and other markings. Note the serial number before you fit it.
Trackpad and palm rest protectors
Trackpad and palm rest protectors are clear or textured films for the trackpad and the areas where your wrists rest. Over time, hands polish the trackpad shiny, wear the finish on the palm rests and leave marks from watches and bracelets. A film takes that wear instead. A good trackpad film keeps the surface smooth enough that your finger still glides and the trackpad still clicks properly. Choose one made for your model, so the edges line up and the film does not stop the trackpad pressing.
Skin or hard-shell case
A skin and a hard-shell case both protect the outside of a laptop, in different ways. A skin is almost weightless, adds nothing to the thickness and leaves the laptop looking like itself in a new colour, but it only stops scratches. A clip-on shell adds some weight and thickness, and takes the scuffs and small knocks of being slid in and out of bags. Shells can trap grit between the shell and the laptop, so take one off now and then to clean underneath. For a laptop that mostly lives on a desk, a skin is usually enough; for one carried every day, a shell, a padded sleeve or both do more.
Keyboard covers
Keyboard covers, thin silicone sheets shaped over the keys, keep crumbs and spills out. They change the feel of typing, and they sit between the keys and the screen when the lid closes. On laptops with very little gap between keyboard and screen, a cover can press on the screen; take it off before closing the lid if it seems to touch.
Cable locks
A laptop cable lock is a steel cable with a loop at one end and a small lock at the other. You loop the cable round something that cannot move, such as a desk leg, and fix the lock into a small security slot on the side of the laptop. It is the laptop equivalent of a bike lock: it will not stop someone with tools and time, but it stops the quick grab when you step away from a desk in a library, an office or a hotel lobby.
Does your laptop have a slot?
Look along the sides and back of the laptop for a small slot, usually narrow and rectangular, often with a small padlock symbol beside it. Many business laptops have one. Many thin laptops do not, because the slot needs room in the case. Security slots come in more than one shape and size, and a lock has to match the slot on your laptop, so check the lock's product page against your laptop before buying.
Laptops without a slot
For a laptop with no slot, there are adapters that fix to the laptop and give the lock something to hold. Some clamp over the edge of the case or onto a port; others are plates stuck to the base. A clamp that grips a port must fit snugly without forcing the port, and an adhesive plate is only as strong as the glue on it. Read the fitting instructions for your laptop before choosing one.
In the office and at home
In a shared office or a hot-desking space, a lock that stays fixed to the desk means you only have to plug the laptop in when you arrive. At home, a lock rarely matters, but a laptop left on view through a ground-floor window is better put away when the house is empty.
Keys or combination
Key locks are simple, but the key has to travel with you. Combination locks save carrying a key, but choose a combination you will remember and that is not obvious. Either way, the cable should be long enough to reach round a desk leg without stretching across a walkway where someone could trip over it.
Other ways to keep a laptop safe
A lock is one part of it. Never leave a laptop alone in a café or on a train seat, lock the screen when you step away, and keep the laptop in a plain sleeve or bag rather than one that announces what is inside. Keeping a note of the serial number makes it easier to report a stolen laptop.
Webcam covers and port plugs
Webcam covers
Webcam covers are small slides that stick over the laptop's camera, so you can close it when you are not on a call. Many people like the certainty of a physical cover, and some workplaces require one.
On a MacBook, there is something important to know first. Apple says that closing a MacBook with a camera cover on may damage the display, because the gap between the screen and the keyboard is made to very tight tolerances. Apple's advice is that if you need a cover, it should be no thicker than about 0.1mm, roughly the thickness of printer paper, and that a thicker cover should be removed before you close the lid. It also says to avoid covers that leave adhesive residue, and notes that a cover can block the sensor that adjusts the screen's brightness automatically. Apple adds that a green light comes on next to the MacBook's camera whenever the camera is on, and that the camera cannot run without it.
The same caution makes sense on any thin laptop with a narrow gap when closed. If a cover is thick enough to feel when you run a finger over it, close the lid gently and see whether it touches before relying on it. Where a laptop shows a camera light, watching for it is a good habit with or without a cover. Both Windows and Mac also let you turn off camera and microphone access for each app in their privacy settings.
Port dust plugs
Port dust plugs are small silicone or plastic stoppers that sit in unused USB-C, USB-A, HDMI and headphone sockets. They keep out the dust, lint and crumbs that collect in a bag or pocket, which matters because a socket full of fluff can stop a plug pushing fully home and make a charger connect only intermittently. Choose plugs that fit snugly but pull out easily, and do not push anything hard into a port to clean it out.
Port plugs, and the spare tabs and clips that come with filters and covers, are small parts. Young children are the most at risk of choking on small objects: RoSPA says children under 36 months are most at risk, and the NHS advises keeping small objects out of reach. Keep spares in a closed pouch, away from small children.
Questions people ask
Does a privacy filter make the screen darker for me?
A little, even straight on, so most people turn the brightness up. From the side it goes dark, which is the point.
Do blue-light screen protectors help my eyes?
The College of Optometrists says the best evidence does not support blue-blocking spectacle lenses for eye strain or sleep, and it makes no case for blue-light screen films either. The warm colour settings built into Windows and Mac do the same tinting for free.
Will a skin damage my laptop?
A good skin made for your model, kept clear of the vents, peels off cleanly. Cheap adhesives can leave residue, especially after heat. Peel slowly.
My laptop has no lock slot. Can I still use a cable lock?
Yes, with an adapter that fixes to the laptop. Check it suits your model and read how it attaches.
Can I close my MacBook with a webcam cover on?
Only if the cover is very thin. Apple says a cover should be no thicker than about 0.1mm, and that a thicker one should be removed before the lid is closed.
Can I use a privacy filter and a screen protector together?
Usually, if the protector is a thin film and the filter clips or sticks to the frame rather than to the screen. Many privacy filters also have a matte, anti-glare side.
Where to go next
Protection is in privacy filters, screen protectors, skins, trackpad and palm rest protectors, cable locks, webcam covers and port dust plugs. For the other parts of looking after a laptop:
- How to clean a laptop safely: the screen, keys, vents and ports
- How to choose a laptop sleeve or bag: protection on the move
- Webcams for video calls: picture, light and camera covers
- Accessories for MacBook Air and MacBook Pro: what fits a MacBook
