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Clearing cookies removes cookie data stored in your browser, but it does not erase every way websites and apps can recognize activity. Pixels, browser fingerprinting, mobile advertising identifiers, third-party trackers and links between connected devices can all play a role. Cookie deletion is one useful privacy control—not a universal tracking reset.
Why tracking can continue after you clear cookies
Cookies are only one way information about your activity can be collected or used. The Federal Trade Commission (FTC) explains that websites may use cookies or pixels to identify activity, including after you leave a site. Apps may use a unique advertising identifier, and companies can connect activity from multiple internet-connected devices, such as a laptop and a smartphone.
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Pixels and third-party tracking
A pixel is a small tracking element that can report activity to a company. A website may also let another company track visitors: that is third-party tracking. The site you visit can collect information directly, while an outside company may receive information through the site and use it to support advertising based on interests and online activity.
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Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.
Browser fingerprinting
Fingerprinting recognizes a browser or device through a combination of its configurations and settings, rather than through a cookie saved in the browser. Deleting cookies does not change those device properties. In a 2017 FTC PrivacyCon transcript, Princeton University researcher Steven Englehardt put the distinction this way: “So whereas you can clear cookies, you can’t really clear your fingerprint because you can’t change your device properties on demand.”
#1 Best Overall
Ailun Privacy Screen Protector iPhone 17e/16e/14/13/13 Pro, 2 Pack
- [2 Pack] This product includes 2 pack privacy screen protectors.WORKS FOR iPhone 17e/16e/14/iPhone 13/13 Pro 6.1 Inch tempered glass screen protector.Featuring maximum protection from scratches, scrapes, and bumps.[Not for iPhone 16 6.1 inch, iPhone 13 mini 5.4 inch, iPhone 13 Pro Max/iPhone 14 Pro Max/iPhone 14 Plus 6.7 inch, iPhone 14 Pro 6.1 inch]
- Specialty: to enhance compatibility with most cases, the Tempered glass does not cover the entire screen. HD ultra-clear rounded glass for iPhone 17e/16e/14/iPhone 13/13 Pro is 99.99% touch-screen accurate.
- 99.99% High-definition clear hydrophobic and oleophobic screen coating protects against sweat and oil residue from fingerprints.
- High Privacy: Keeps your personal, private, and sensitive information hidden from strangers,screen is only visible to persons directly in front of screen.Good choose when you are in the bus,elevator,metro or other public occasions.(Note: Due to this privacy cover will darken the image to prevent the peeking eyes near you, you might need to turn your device display brightness up a bit when use it.)
- Online video installation instruction: Easiest Installation - removing dust and aligning it properly before actual installation,enjoy your screen as if it wasn't there.
Mobile identifiers and connected devices
Apps may use a mobile advertising identifier, which is separate from browser cookies. Companies may also link activity across devices connected to the internet. That means changing cookie data on one browser does not necessarily affect identifiers or activity associated with an app, another browser or another device.
What the historical tracking figures do—and don’t—show
Older studies illustrate how extensively tracking infrastructure appeared in the web samples researchers examined. They are not current estimates of how much tracking happens today.
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SMARTDEVIL 2 Pack Privacy Screen Protector for iPhone 17 Pro Max, Anti-Spy
- Perfect Fit for iPhone 17 Pro Max：Engineered exclusively for iPhone 17 Pro Max with seamless edge-to-edge coverage, ensuring precise alignment and reliable full-screen protection.
- Advanced Privacy Protection：Features a 28° privacy filter with smooth 2.5D curved edges, preventing side glances in public. Your screen remains visible only to you—ideal for commuting, traveling, and crowded environments.
- Effortless Installation：Equipped with an auto dust-elimination tool that delivers a fast, accurate, and bubble-free application, keeping your screen perfectly clear with minimal effort.
- Military-Grade Protection：Made of nano-reinforced 9H tempered glass, SGS certified. Provides 5X stronger scratch resistance and proven durability, withstanding thousands of pressure and impact tests.
- Smudge & Fingerprint Resistant：Hydrophobic and oleophobic coating repels fingerprints, sweat, and oil—ensuring your screen stays clean, clear, and smooth to the touch.
| Historical finding | Study context |
|---|---|
| Google was present on 85% of sites visited in the crawl. | Princeton web crawl, as reported by Steven Englehardt at FTC PrivacyCon in 2017. |
| 83% of HTTP cookies were set by third-party hosts. | Web Privacy Census study discussed at FTC PrivacyCon in 2016. |
| Google tracking infrastructure appeared on 92 of the top 100 websites and 923 of the top 1,000. | Web Privacy Census study discussed at FTC PrivacyCon in 2016. |
These measurements describe the studies and years shown, not the current prevalence of trackers across websites.
Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.
Which privacy controls help, and what they cannot block
No single setting or tool prevents every kind of tracking. Use controls that match the mechanism you want to limit, and keep in mind that browser protections differ.
Rank #3
Ailun Privacy Screen Protector for iPhone 16 / iPhone 15 / iPhone 15 Pro
- [3 Pack] This product includes 3 pack privacy screen protectors.WORKS FOR iPhone 16/iPhone 15/iPhone 15 Pro 6.1 Inch tempered glass screen protector. Due to the rounded edge design of the iPhone 16/iPhone 15/iPhone 15 Pro and to enhance compatibility with most cases,the tempered glass screen protectors will be slightly smaller than the phone screen.[Not for iPhone 16e 6.1 inch, iPhone 15 Plus/iPhone 15 Pro Max/iPhone 16 Plus 6.7 inch,iPhone 16 Pro 6.3 inch,iPhone 16 Pro Max 6.9 inch]
- Specialty: HD rounded glass for iPhone 16/iPhone 15/iPhone 15 Pro 6.1 Inch is 99.99% touch-screen accurate.
- 99.99% High-definition hydrophobic and oleophobic screen coating protects against sweat and oil residue from fingerprints. Featuring maximum protection from scratches, scrapes, and bumps.
- High Privacy: Keeps your personal, private, and sensitive information hidden from strangers,screen is only visible to persons directly in front of screen.Good choose when you are in the bus,elevator,metro or other public occasions.(Note: Due to this privacy cover will darken the image to prevent the peeking eyes near you, you might need to turn your device display brightness up a bit when use it.)
- Online video installation instruction: Easiest Installation - removing dust and aligning it properly before actual installation,enjoy your screen as if it wasn't there.
| Control | Can help with | Does not guarantee |
|---|---|---|
| Delete cookies and clear browsing or search history | Some personalization based on stored browser data and previous activity. | Removal of fingerprinting, app identifiers or tracking tied to other devices. |
| Browser privacy settings | Managing history, location and other information sharing options, depending on the browser. | The same protection across every browser or complete blocking of tracking. |
| Private browsing | Some browsers delete browsing history after the session. | Keeping websites from seeing your activity while you browse. |
| App permissions and device identifier settings | Limiting access to data such as location, contacts and photos, and addressing identifiers used for tracking. | Stopping all data collection or activity linked through other means. |
| Ad blockers or tracker-blocking tools | Some pixels and other trackers, depending on the tool. | Blocking every tracker or ad; they are not a substitute for malware protection. |
| Industry advertising opt-outs | Limiting some personalized advertising, where supported. | Making ads disappear or applying automatically to every browser and device. |
| Cookie notices | Choosing among the options a site offers, which may include necessary-only cookies versus advertising or other uses. | Controlling tracking outside the choices offered by that site. |
A practical checklist for reducing tracking
- Clear browser data. Delete cookies and clear browsing and search history to remove some data used for personalization based on prior activity.
- Review browser privacy settings. Look for controls covering browsing history and location. Their names and protections vary by browser, so consult that browser’s current official support documentation for exact steps.
- Use private browsing for the purpose it serves. It may prevent history from being retained after a session in some browsers, but it does not hide your activity from the websites you visit.
- Check app permissions. Review access to location, contacts and photos, and disable permissions an app does not need. On phones, delete or reset identifiers used for tracking where your device’s settings allow it.
- Make a deliberate choice at cookie notices. Review the available options and select the settings that fit your preferences, such as necessary-only cookies when offered.
- Consider a tracker blocker. Some ad blockers can block pixels and other trackers, but coverage is not universal. Do not treat one as a complete privacy or malware-protection solution.
- Repeat applicable opt-outs. Industry opt-out tools may need to be used separately for each device and browser. Personalized ads may be limited while ads continue to appear.
- Review connected-device settings. Check privacy settings and permissions on connected TVs and streaming devices, not only computers and phones.
What to expect after making changes
Cookie deletion can affect some tracking and personalization, but a website or app may still recognize activity through other mechanisms. Browser settings and blocker tools can reduce some collection, yet their coverage differs. Treat each control as a way to limit particular data flows—not as a promise that you cannot be tracked.
Quick Recap
Bestseller No. 1
Best Value
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UltraGlass TOP 9H+ Armor for iPhone 17 Pro Max Privacy Screen Protector 6.9
- 【Industry-Leading 100% Anti-Spy Privacy Protection】Designed for iPhone 17 Pro Max. Larger iPhone screens are easier for others to glance at, so UltraGlass uses patented, SEGI-certified 25° Blackout-3 optical technology to help block side views and keep emails, banking apps, and private content visible only to you—while keeping the front view HD-clear and comfortable through hours of scrolling and streaming.
- 【Unbreakable TOP 9H+ Glass, the Excellent 2nd Screen for Your iPhone】Boasting unparalleled shatter resistance and durability. And the core excellence is the top 9H+ tempered glass material, which is widely applied in aerospace and military fields for its ① Shatter-proof ② Scratch & Wear Resistance ③ Durability that is 7-8 times higher than other materials. Thus, UltraGlass builds a second tough screen for your iPhone 17 Pro Max.
- 【Invisible Armor, 1:1 Full Covers the iPhone's Screen】Mimicking the iPhone's original screen design, it uses a 1:1 3D curved reinforced black edge that wraps around every curve — case friendly — while securing even the most vulnerable edges. Seamlessly blending with the iPhone 17 ProMax screen, it's virtually invisible and feels like the original screen while offering enhanced full-screen protection.
- 【0 Bubbles + 0 Dust + 0 Misaligned =100% Successful Installation】Includes everything you need with pioneering automatic positioning, dust removal, and absorption technology, making the installation just effortlessly easy in seconds. No bubbles, no troubles—transforming beginners into experts!
- Trusted Quality, Lifetime Support】Trusted by millions worldwide, UltraGlass comes with a Lifetime Warranty covering installation, fit, and accidental damage. Our 24/7 support team is ready to help with fast, 1-on-1 assistance.
Rank #4
Ailun Privacy Screen Protector+Camera Lens Protector for iPhone 16, 3+3Pack
- [3+3 Pack] This product includes 3 pack privacy screen protectors and 3 pack camera lens protectors with Installation Frame. Works For iPhone 16 [6.1 inch] tempered glass screen protector and camera lens protector. Featuring maximum protection from scratches, scrapes, and bumps. [Not for iPhone 16e 6.1 inch, iPhone 16 Pro 6.3 inch, iPhone 16 Pro Max 6.9 inch, iPhone 16 Plus 6.7 inch]
- Night shooting function: specially designed iPhone 16 6.1 Inch camera lens protective film. The camera lens protector adopts the new technology of "seamless" integration of augmented reality, with light transmittance and night shooting function, without the need to design the flash hole position, when the flash is turned on at night, the original quality of photos and videos can be restored.
- High Privacy: Keeps your personal, private, and sensitive information hidden from strangers, screen is only visible to persons directly in front of screen. Good choose when you are in the bus,elevator,metro or other public occasions. (Note: Due to this privacy cover will darken the image to prevent the peeking eyes near you, you might need to turn your device display brightness up a bit when use it.)
- Easiest Installation - Please watch our installation video tutorial before installation. Removing dust and aligning it properly with the help of the included installation frame before actual installation, enjoy your screen as if it wasn't there.
- 99.99% High-definition clear hydrophobic and oleophobic screen coating protects against sweat and oil residue from fingerprints, and enhance the visibility of the screen.
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