Browser Region Leak Checker
Does your browser look like a China-based user? Scan 6 environment signals and get a fix for every one that flags. 100% client-side · nothing uploaded.
Scan the 6 environment signals your browser leaks and estimate how strongly it looks like a China-based user. The higher the score, the more likely region-detection logic flags you.
What each signal weighs
| Signal | Weight | How it's read |
|---|---|---|
| System timezone | 30 | Intl.DateTimeFormat().resolvedOptions().timeZone |
| Browser language | 24 | navigator.language / navigator.languages |
| Chinese fonts | 20 | Canvas text-width probe |
| Intl locale | 10 | Resolved date/number format locale |
| Timezone offset | 8 | getTimezoneOffset() |
| Platform hint | 8 | navigator.platform (weak, not scored) |
Frequently Asked Questions
What does this tool actually check?
It reads six environment signals your browser exposes to any website: your system timezone (Intl.DateTimeFormat), browser language (navigator.language / navigator.languages), installed Chinese fonts (via a Canvas width-probe), the resolved Intl locale, your timezone offset (getTimezoneOffset), and a weak platform hint. Each matching signal adds a weighted amount to a 0–100 score. The higher the score, the more your browser looks like a mainland-China user to region-detection logic.
Is any of my data sent to a server?
No. Every check runs entirely in your browser using standard JavaScript APIs. Nothing about your environment is transmitted or stored. You can open the Network tab in your browser's developer tools and confirm that scanning produces no outbound requests.
Why would a browser be 'detected as Chinese'?
Many apps and services infer your region from a bundle of browser signals rather than IP alone — to pick a language, route traffic, or apply regional rules. A machine set to Asia/Shanghai timezone, zh-CN language, with Chinese fonts installed, matches the common heuristic for a mainland-China user. This tool mirrors that heuristic so you can see what you leak.
How do I make my browser look less Chinese?
Each flagged signal comes with a specific fix. In short: change your OS timezone to an overseas one (e.g. America/New_York), set your browser's preferred language to en-US and remove Chinese, and set your system region to the United States. Chinese fonts are the hardest to hide because they are system-installed; a clean profile or anti-fingerprint extension helps there.
Does a low score guarantee I won't be flagged?
No. This is an educational self-check based on publicly known browser fingerprinting methods, not a definitive test of any specific service. Real detection systems may use additional signals (IP address, TLS fingerprint, account history). Treat the score as a directional indicator, not a guarantee.
What is the timezone offset signal?
getTimezoneOffset() returns the difference in minutes between your local time and UTC. China Standard Time is UTC+8, which returns -480. Because it shares a root cause with the system timezone, fixing your OS timezone automatically corrects this value too — no separate step needed.