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Online Privacy: The Complete Guide
What ‘privacy online’ actually means, and the practical levers that matter.
Online privacy is the ability to choose what others know about you on the internet. Practically, it comes from controlling cookies and trackers, encrypting communications (messaging, email, DNS), and being thoughtful about which services you log into.
Key takeaways
- Browser hardening
- Encrypted communications
- Trackers, cookies, and fingerprinting
- Account hygiene
Privacy isn’t all-or-nothing. This pillar walks through realistic levers — what to change in your browser, where to draw the line, and which trade-offs are worth it.
Browser hardening
Block third-party cookies, install one trusted content blocker, separate profiles for logged-in and casual browsing, and pick a private-by-default search engine.
Encrypted communications
End-to-end encrypted messaging (Signal/WhatsApp), encrypted email between users on the same service, and DNS-over-HTTPS to protect lookups.
Trackers, cookies, and fingerprinting
Three different identification techniques — defending against all three is what serious privacy looks like.
Account hygiene
Fewer accounts, less data shared per account, and unique aliases (e.g. ‘plus addressing’) so leaks are easy to trace.
Related guides on Sentrly
This pillar links out to deeper articles on each topic. Save this page and use the cards below as your reading path.
Encrypted Messaging Apps Compared (Without the Drama)
Signal, WhatsApp, iMessage, Telegram — what they actually encrypt, and from whom.
Read article →Browser Privacy Settings: A Quick Tune-Up Guide
Ten minutes in your browser settings cuts the majority of casual tracking.
Read article →Cookies, Trackers, and Fingerprinting Explained
Three different ways the web identifies you — and why blocking only one isn’t enough.
Read article →DNS Privacy Explained: DoH, DoT, and Why They Matter
Every website you visit starts with a DNS lookup. By default, that lookup is unencrypted.
Read article →Email Privacy: PGP and Encrypted Email Services
Why ordinary email is a postcard, and how to send sealed envelopes when you need to.
Read article →Frequently asked questions
Is privacy possible without becoming a hermit?
Yes. The 80/20 of privacy is achievable in a weekend — minimal lifestyle change.
Should I use Tor for everyday browsing?
Tor is the strongest practical option but has noticeable trade-offs in speed and convenience. Most people don't need it daily.
Is private/incognito mode enough?
It only forgets local history. Sites, ISPs, and networks still see you.
How do I delete my old accounts?
Use directories like JustDeleteMe, then check breach trackers to see what's already leaked.