Browser Fingerprint Checker

Why browser fingerprints matter

Advertisers, analytics companies, and even security teams often rely on fingerprinting to differentiate real users from bots. A fingerprint combines IP, timezone, installed fonts, GPU rendering, screen specs, and dozens of other data points into a unique signature. Understanding what you leak helps you increase privacy through browser extensions, VPNs, or hardened setups.

OneToolBox keeps everything client-side. Nothing here requires an account or sends your private data to a server. Bookmark this page to regularly compare how tweaks to your setup change the uniqueness score.

What this tool does

The browser fingerprint checker collects a snapshot of common client-side signals, including user agent, language, timezone, screen attributes, and rendering hints. It then summarizes how unique those signals are and produces a readable fingerprint hash that you can compare over time. Everything runs locally in your browser, so the data never leaves your device. This helps you understand how websites, analytics, and security tools can recognize repeat visitors even without cookies. Use the report to spot risky exposures and verify whether privacy tweaks or extensions actually reduce fingerprint uniqueness.

How to use this tool

• Open the page and wait for the fingerprint summary to load.
• Review the hashed ID and the detailed signal list below.
• Make a privacy change (VPN, extension, browser profile) and refresh.
• Compare the new hash to see what changed.

Why this tool is useful

It gives you a quick, transparent way to understand tracking resilience and test whether privacy changes are effective without sharing your data with a third party.

FAQ

Does this tool store or transmit my data?

No. The fingerprint is calculated in your browser and is not sent to a server.

Why does my fingerprint change over time?

Updates to your browser, device, extensions, or network settings can alter the signals used to build the fingerprint.