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Check Your Browser for Security and Privacy Weaknesses

Runs entirely in your browser: Measures how unique your fingerprint is, tests WebRTC and IP leaks, checks whether your browser version is current, and probes which security policies it actually enforces.

Takes about five seconds. Signals are hashed before anything is sent, so we learn how common your browser is without learning what it is. What we keep

Illustration of the browser security & privacy check in use

What this tool checks

16 checks across 1 areas. Each links to its reference page with the test, the risk and the fix.

Full reference

Browser privacy and policy enforcement

16 checks

The ones that most often decide the grade:

High Browser version is out of dateYour browser is behind the current stable release, so it is missing security fixes for bugs that attackers already... Medium Browser fingerprint uniquenessThe combination of signals your browser exposes matched no other visitor in our sample, so it could be used to... Low Canvas fingerprinting exposureYour browser renders a hidden test image identically every time and lets scripts read the pixels back, so the result... Low WebGL renderer exposureScripts can read your graphics card model and driver details through WebGL, a strong and long-lived identifying signal. High WebRTC IP address leakWebRTC revealed an IP address that differs from the one your connection uses, typically your real address behind a... Info Do Not Track signalYour browser is not sending the DNT: 1 header. Most sites ignore the signal in any case, so this is informational.

After this one, most people run Extension Analyzer, or WebRTC & IP Leak Test. Each answers a different question about the same thing, and the full list of tools explains which to reach for when. Every finding links through to the checks reference.

Guides for this tool

Background reading written to go with these results.

12 min read · Updated Sep 12, 2026 Browser Security: How Your Browser Is Attacked, Tracked and Hardened

Your browser is the most exposed program on your computer. This hub explains the browser's security model, the ways it leaks identity...

Read the guide 8 min read · Updated Sep 05, 2026 Is My Browser Secure? A Practical Checklist

A secure browser is up to date, enforces the web's security policies, leaks little through WebRTC and fingerprinting, and runs only...

Read the guide 7 min read · Updated Sep 02, 2026 Browser Fingerprinting Explained: How Sites Identify You Without Cookies

Browser fingerprinting combines dozens of small facts about your browser and device into an identifier that survives cookie deletion and...

Read the guide 7 min read · Updated Sep 13, 2026 Why Browser Updates Matter: Zero-Days, Patch Gaps and Auto-Update

Browsers are patched every few weeks because attackers find exploitable bugs constantly. What a zero-day is, how long you are exposed...

Read the guide 7 min read · Updated Sep 11, 2026 WebRTC Leaks: How Your Browser Can Expose Your Real IP Behind a VPN

WebRTC lets browsers talk to each other directly, and to do that it discovers your network addresses, sometimes bypassing a VPN. The...

Read the guide 6 min read · Updated Sep 12, 2026 Cookies Explained: First-Party, Third-Party, SameSite and the Flags That Protect Them

Cookies keep you logged in and also follow you across sites. How they work, the difference between first- and third-party cookies, what...

Read the guide

Frequently asked questions

Does this test send my data anywhere?

The fingerprint test sends only hashes of each signal, never the values, so we can estimate how common your combination is. The IP shown is what your connection already presents to every site.

Why is my fingerprint unique?

Combinations of screen size, fonts, GPU and time zone are individually common but jointly rare. The result page shows which signals contribute the most identifying bits.

Can you tell if my browser is up to date?

Yes. We read the version from your User-Agent or Client Hints and compare it with the current stable release from the vendors' own release feeds.

What do the policy-enforcement tests do?

They load small pages served with specific security headers and check whether your browser obeyed them, the approach BrowserAudit pioneered.