Protecting Your Digital PrivacyUpdated: 2026
Understand how your data is collected, tracked and used — and learn to reduce your digital footprint without giving everything up.
By the end of this module, you'll be able to…
- Distinguish useful cookies from intrusive tracking cookies
- Understand fingerprinting and how you can be identified without cookies
- Reduce your online exposure with simple settings
- Adopt more discreet browsing without giving up convenience
What is digital privacy?
You search for plane tickets to Barcelona. Two hours later, your Instagram feed is full of ads for Barcelona hotels and travel agencies. You clicked on nothing, bought nothing. How did they know?
Digital privacy is your ability to control what information you share online, with whom, and for what purpose. Every website, app and service collects data about you — often far more than you realize.
This data is mainly used for ad targeting. But in the wrong hands, it can be used for social engineering, identity theft, or manipulation.
Cookies — usefulness and limits
Cookies are small files stored by your browser to remember information. There are several types:
- • Keeping you logged in
- • Remembering your shopping cart
- • Saving your preferences (language, theme)
- • Tracking your browsing across every site
- • Profiling your interests for targeted ads
- • Sharing your data with third parties
Third-party cookies and ad tracking
Third-party cookies are set by domains other than the site you're visiting. For example, visit a news site — Google, Facebook and dozens of ad networks set their own cookies to recognize you on other sites.
These cookies let companies build a very detailed profile of your interests, behavior, and shopping habits. This profile is sold to advertisers.
✓ Limiting third-party cookies
- Use Firefox or Brave — they block third-party cookies by default
- Install uBlock Origin — blocks ad trackers
- Chrome now lets you disable third-party cookies in settings
- Click "Reject all" in cookie banners — not just "Accept"
Browsing history and data exposure
Your browsing history is a goldmine of information about your habits, health, beliefs, financial struggles, and relationships. This data, combined with other data, can be highly sensitive.
✓ Managing your history
- Clear your history regularly (Ctrl+Shift+Delete in most browsers)
- Use private browsing mode for sensitive searches — note: it doesn't hide your activity from your internet provider
- Disable Google search history (myactivity.google.com)
- Consider a privacy-respecting search engine: DuckDuckGo, Startpage, Brave Search
It only stops your browser from saving history locally. Your internet provider, your employer, and the sites you visit still see you.
Browser fingerprinting
Even without cookies, websites can identify you through fingerprinting. By combining dozens of technical characteristics of your device and browser, they create a unique identifier.
Name, version, installed plugins
Resolution, GPU, approximate RAM
Timezone, language, locale
IP address, ISP
Mouse movement, typing rhythm
Graphics rendering unique to your GPU
Combined, this information is unique to 1 person in 286,000 — enough to identify you without a single cookie.
Reducing your online exposure
✓ Effective actions in order of priority
- Decline non-essential cookies — click "Reject all" in consent banners
- Install uBlock Origin — blocks most trackers and ads
- Use Firefox or Brave — built-in fingerprinting protection
- Change your default search engine — DuckDuckGo or Startpage
- Check your mobile apps' permissions — revoke location, contacts, and photo access when not needed
- Limit logging in via Facebook/Google — "Sign in with Google" shares your activity data
Configuring your browser for better privacy
✓ Essential settings (Chrome/Firefox/Edge)
- Disable telemetry and usage statistics sent to the browser
- Enable enhanced tracking protection (Firefox: Settings → Privacy → Strict)
- Disable password autofill if you use a dedicated manager
- Clear cookies and site data on browser close (optional but effective)
- Review and delete stored cookies: Settings → Privacy → Cookies
Best practices for more discreet, safer browsing
Protecting your privacy doesn't mean becoming paranoid or giving everything up. It's about a few habits that significantly reduce your exposure without complicating your life.
✓ Good habits summary
- Systematically decline non-essential cookies
- Use an ad blocker (uBlock Origin)
- Browse in private mode for sensitive searches
- Review your mobile apps' permissions every month
- Avoid logging in with Facebook or Google on third-party services
- Use temporary email addresses for low-importance signups
What do they know about you?
Click to see what information your browser automatically exposes to every website. Everything is calculated locally — no data is sent anywhere.
This information is displayed only in your browser. No server receives it. You can verify this in developer tools (F12): no network request is triggered.
Module quiz
Test what you've learned with 4 questions.
See also