How does browser fingerprinting work?
GeneralClass 10CBSEAnswered 25 May 2026
Answer
When you visit a website, JavaScript on the page queries your browser for detailed information:
- Canvas fingerprint: your graphics card renders an invisible image; tiny differences in how hardware renders it create a unique ID
- Audio fingerprint: your audio system is queried similarly
- Installed fonts: tested by checking which characters render at which sizes
- Screen size, colour depth, pixel ratio: read directly
- Time zone, language, do-not-track setting: collected automatically
- WebRTC: can reveal your real local IP even behind a VPN
All values are combined into a single identifier. No single value is unique, but the combination typically is. This persists across sessions, private browsing, and different browsers on the same device.
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