Buying Guide: Privacy Screen Filters to Stop Visual Hacking

What is visual hacking?

Visual hacking is a type of security attack that involves someone attempting to gain unauthorized access to sensitive or confidential information by looking at it directly, without permission or knowledge of the owner.

This can be done through a variety of methods, such as peeking over someone's shoulder or looking at their computer screen or mobile device. It can also be physically stealing or copying documents.

Visual hacking is a low-tech and relatively easy way to breach security measures. It requires little to no technical skill or specialized equipment. However, it can still pose a significant threat to individuals and organizations, especially if the information accessed is highly sensitive or confidential. Even the smallest piece of information could later be used in a phishing attack.

Using a privacy filter on your devices is one of the best ways to keep documents and other sensitive information and personal data hidden from prying eyes.

What is a screen privacy filter?

A screen privacy filter is a thin layer of high-tech plastic, such as polycarbonate or acrylic, that is placed over the screen of an electronic device to help keep the content on the screen private.

Using special technology, most commonly micro-louver technology, they allow light to pass through only from certain angles.

Inside the angles, the screen will be visible. Outside of those angles, it won't.

Basically, they allow a user who is looking directly at the screen to see everything but anyone off to the side will only see a darkened/blackened screen.

In a way, a privacy filter acts very much like traditional Venetian window blinds— with the “blinds” set to a specific angle to limit the view. It's a very low-key, affordable tool to improve privacy.

Are screen privacy filters just the same as phone screen protectors?

Not quite. A screen privacy filter is specifically designed to hide the screen from those looking at it from an angle. Screen protectors are designed to protect the screen from damage. That said, some screen protectors may also include privacy protection technology as an additional feature. And vice versa.

Most privacy screen protectors provide some level of protection against damage, such as scratches, smudges, or fingerprints. More on this later.

Who uses screen privacy filters?

Screen privacy filters are a good idea for basically anyone who values their privacy and wants to protect their device screen from prying eyes. Here are a few examples of users who would get the most benefit out of a screen privacy filter:

• Business professionals and digital nomads who need to work on confidential documents or information in public places.
• Students who want to protect their personal information from being viewed by others in crowded libraries or lecture halls.
• Individuals who frequently travel on public transportation and who want to protect their device screen from being viewed by others.
• Parents who want to protect their children's privacy when they use their devices in public places.
• Anyone who uses their device to access sensitive or confidential information, such as bank accounts or medical records.

Things to consider before buying a screen privacy filter

There are so many variables when looking for the best screen privacy filter. It will depend on the type of device you wish to protect, the model, how you use it, and where. So a superficial “best of” list or a narrow selection of filters will be pointless.

We thought it much better to arm you with as much information as possible so that you can make an informed decision to choose a privacy filter that will be the best for your specific needs.

Here are the most important factors to consider when choosing a screen privacy filter.

Device compatibility

First and foremost, device compatibility. There are countless brands and models for every type of device, so of course, not all protectors will fit all devices.

A privacy filter for an iPhone isn't going to work with an Android. A computer screen privacy filter isn't going to be compatible with a laptop screen filter.

Also, keep in mind that not all privacy filters are touchscreen-compatible.

So before you part with your hard-earned cash be sure to check that the product is designed for your specific device model.

Viewing angle

Different privacy screen protectors have different viewing angles. Some have a narrower angle than others, which means that the screen will be less visible from the sides.

You want the viewing angle to be narrow enough so that anyone standing or sitting next to you is kept in the “dark”. But too narrow and you'll only be able to see your own screen if you're directly head-on.

You need just the right amount of wiggle room to keep your viewing experience comfortable while making it impossible for others.

Most filters have a viewing angle of 60 degrees (30 degrees to either side of the user) or 90 degrees (45 degrees to either side of the user). Consider your specific use case, and how close strangers may be to you, and select a product with an appropriate viewing angle.

Polarized or not

Polarized screen privacy filters work by using a special film to only allow light from directly in front of the screen. This makes it difficult for people to read what's on the screen from the sides. However, it may be difficult to use the device in direct sunlight and when it's lying flat. Polarized might not be the best privacy filter option for mobile phones, but it could be a good option for laptops where you can adjust the angle of the screen.

Two-way or four-way privacy

A two-way filter, also known as a "side view filter," only blocks visibility from the left and right sides of the screen, while allowing full visibility from directly in front of the screen. On a mobile phone, a 2-way filter only works in portrait mode, so you have the option to switch to landscape should you actually want to share your screen with someone sitting next to you.

A four-way filter, or "multi-directional filter," blocks visibility from all four sides of the screen, making it impossible to see what is being displayed on the screen from any angle other than directly in front of it.

This type of filter is particularly useful in busy public spaces where people may be viewing the screen from a variety of different angles, and where the risk of data theft or snooping is high.

Screen clarity

Not all privacy filters are made equally, and some inadequate products out there will impact screen clarity or brightness. For anyone in a detail-oriented profession, high-quality visibility is a must but that doesn't mean you have to compromise on privacy. A privacy filter with a gloss finish (rather than matte) can optimize your viewing experience while still providing privacy.

Installation method

Different filters have different installation methods, ranging from magnetic attachments to adhesive-based, hanger arms, and slide-on. Choose a product that's easy to install and remove without damaging the device or leaving behind a sticky residue. One of the biggest producers of privacy filters, 3M, has a page dedicated to showing how to attach the different types of filters.

Additional features

Depending on the brand, you can find screen privacy filters with a wide range of additional perks. Here are a few of the most common that you're likely to come across.

• Anti-glare: An anti-glare privacy filter works by incorporating a special coating on the surface of the filter that diffuses light and reduces the amount of reflection that bounces off the screen. This results in a clearer, more readable image that is easier on the eyes. It can also be beneficial for people who work outdoors or in brightly lit environments, such as construction sites or outdoor events. If you're a digital nomad, working by the pool, then it could be a good feature to have in a privacy filter.
• Blue light filtration: Blue light filtering technology can reduce the amount of blue light emitted by the device. This not only helps to protect the eyes but also makes it easier to use the device for extended periods without experiencing eye fatigue or discomfort.
• Anti-fingerprint coating: Anti-fingerprint coatings help to repel fingerprints and smudges, keeping the screen clean and clear. They typically use a hydrophobic or oleophobic material that prevents oils and other substances from sticking to the screen.

Reviews

Finally, check customer reviews before making a purchase. Reviews can provide valuable insights into the product's performance, durability, and ease of use, which will help you make an informed decision.

Advantages of using a screen privacy filter

The biggest advantage is, of course, privacy. The clue is in the name! Its sole purpose is to protect your sensitive data on screen from visual hacking and prying eyes. They give peace of mind when using your devices in public, but not only...

Screen privacy filters can also give you greater privacy in the workplace and at home. If you have a roommate or partner who gets annoyed by the light of your phone, a privacy filter also cuts that out so they won't be disturbed. So you can scroll all night to your heart's content.

Most will also have a level of screen protection with scratch resistance, anti-smudge, or anti-fingerprint features. Certain brands of screen privacy filters may advertise their own specific advantages. The most common tend to be blue-light filters or anti-glare coatings.

Disadvantages of using a privacy filter

Be aware that even though many privacy filters promise no interference with screen clarity or brightness, this isn't always the case. Turning up the screen brightness can help but if you're using a mobile, it'll drain the battery faster and may even affect the privacy filter's effectiveness.

Privacy filters also mean you have to be a bit more purposeful with your phone use. You have to hold the phone directly in front of you to see. That means no more side glances to quickly check that notification. It's a minor inconvenience but could be annoying for some.

If you use a screen privacy filter on your smartphone it may make it harder when you actually do want someone else to see your screen. You'll have to angle it in just the right way. However, two-way privacy filters will let you flip to landscape and avoid that issue.

FAQs about screen privacy filters

Here are some common FAQs and answers about using privacy screens:

Q: Do privacy filters reduce screen clarity?

A: Some will impact screen clarity or brightness but most modern filters are designed to maintain screen clarity and brightness while still providing privacy.

Q: Do privacy filters reduce touchscreen sensitivity?

A: Most screen filters are thin enough to not affect touch screen sensitivity and should work with your high-tech devices.

Q: Can privacy filters be removed easily?

A: The ease of removing can vary depending on the product. Some slide-on privacy screens can be easily removed, while adhesive-based filters may be more difficult to remove and may leave residue on the screen. It is important to choose a product that is easy to install and remove without damaging your device.

Q: Do privacy filters protect the screen from scratches and impacts?

A: Many filters also offer protection from scratches and impacts. However, the level of screen protection can vary depending on the product. If you're a clumsy sort and prone to dropping your device or you work in a harsher environment, then a screen protector with privacy features will give more damage protection and keep screen data safe from prying eyes.

Q: Can I use a privacy filter with a case on my device?

A: Yes, in most instances, you can use a filter with a case on your device. Just be sure to choose a product that is compatible with your device and the case to ensure a proper fit.

Q: Are screen privacy filters safe to use?

A: Yes, they are generally safe to use and don't pose any significant health risks. However, make sure you choose a product from a reputable manufacturer and follow the manufacturer's instructions for use and installation.

Q: Do privacy screen filters work in all lighting conditions?

A: The effectiveness of a privacy filter can vary depending on the lighting conditions. Some may be less effective in bright or direct sunlight, while others may work well in all lighting conditions.

Q: Do privacy filters lower screen quality or viewing experience?

A: It really depends on the quality of the specific filter but if you do the research and check the reviews, there is no reason why a good quality privacy filter should interfere with screen functionality or cause any blurring or distortion.

Stop visual hacking with a screen privacy filter

Screen privacy filters are an essential tool for the privacy-conscious or anyone who works with sensitive data. Whether you're a business professional, a digital nomad, a student, or a frequent traveler, privacy screen protectors can keep your screens hidden from bad actors or nosey neighbors. Now you know what to consider, you'll be able to choose the best privacy filter for your needs.

Privacy filters protect visual hacking in the offline world, but what about online privacy? READ: 10 Ways To Improve Your Privacy Online