Browser check: is your browser telling the truth?

What this page checks

A browser tells websites dozens of facts about itself: the system and version, languages, time zone, screen size, graphics card, fonts, number of CPU cores. Together they form a browser fingerprint. We collect this data in your browser, add what the server sees (IP address, network, request headers) and cross-check everything.

A real browser is consistent with itself. Antidetect browsers, spoofing extensions and bots usually change only some of the values, and the seams between them show contradictions: the User-Agent says one thing, Client Hints another, a background thread sees a third. Each contradiction is shown as a separate finding with an explanation.

How to read the result

• Truth index: 100 means no contradictions. Every finding lowers it: a contradiction a lot, a suspicious sign moderately, a weak signal slightly.
• Contradiction: something a regular browser never does. Almost always spoofing or automation.
• Suspicious: has innocent explanations (a VPN, a corporate network, a laptop with two graphics cards), but often shows up in spoofed browsers.
• Privacy protection: Brave, Firefox with resistFingerprinting and Tor Browser change data on purpose. That is not lying, and the index does not drop for it.
• Fingerprint ID: a short code built from the stable traits of your browser. If two "different" profiles share it, websites can link them together.

Frequently asked questions

Is my data stored?

No. The data is sent to our server once for the cross-check and forgotten right away; only the daily number of checks is counted. The "Copy JSON" button gives the full result to you alone.

Why does a VPN lower the index?

A VPN is not lying in itself, but the browser time zone often does not match the VPN server country, and the address belongs to a data center. Sites that defend against bots and multi-accounting see exactly this, so we show how your browser looks to them.

What is this for in business?

The same checks help tell a real visitor from a bot or a spoofed browser at sign-up, checkout or promo code use. We are preparing an API and plugins for websites built on these checks.