What Is Browser Fingerprinting?
Browser fingerprinting is a tracking technique that identifies you based on your browser and device characteristics — without using cookies. It collects data like:
- Browser type and version
- Operating system
- Screen resolution
- Installed fonts
- WebGL renderer (your graphics card)
- Audio context
- Canvas rendering
- Timezone and language
- Installed plugins
Combined, these create a unique "fingerprint" that identifies you with 90-99% accuracy.
How Is It Different from Cookies?
| Feature | Cookies | Fingerprinting |
|---|---|---|
| Storage | Stored in browser | Not stored — calculated each visit |
| Can be deleted | Yes | No — it's based on your hardware |
| Can be blocked | Yes, easily | Harder to block |
| User consent required | Yes (GDPR) | Often done without consent |
| Accuracy | High (unique ID) | Very high (90-99%) |
Who Uses Fingerprinting?
- Ad companies: To track you when cookies are blocked
- Fraud prevention: Banks use it to detect unusual logins
- Analytics: Some analytics services use it as a cookie alternative
How to Reduce Fingerprinting
1. Use an features" class="doc-internal-link">Ad Blocker
Extensions like DNDShield block known fingerprinting scripts from loading in the first place. This is the most effective defense.
2. Use Firefox with Enhanced Tracking Protection
Firefox blocks known fingerprinting scripts in Strict mode: Settings → Privacy & Security → Enhanced Tracking Protection → Strict
3. Use Tor Browser
Tor makes all users look identical, defeating fingerprinting. However, it's slow for daily browsing.
4. Disable JavaScript (Extreme)
Most fingerprinting requires JavaScript. Disabling it breaks most websites but eliminates fingerprinting.
What DNDShield Does
DNDShield blocks known fingerprinting scripts before they execute:
- Canvas fingerprinting scripts
- WebGL fingerprinting
- AudioContext fingerprinting
- Font enumeration scripts
- Known fingerprinting domains (over 200 blocked)
FAQ
Can I be completely anonymous? No. Complete anonymity is nearly impossible. The goal is to make tracking significantly harder, not perfect.
Does incognito mode prevent fingerprinting? No. Incognito mode only prevents cookie storage. Your browser fingerprint is the same in incognito.