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Fake Certificate Warning - Free Online | FunToolX

Use Fake Certificate Warning online for free, no download required. FunToolX offers hundreds of fun online tools.

Click "Start" to simulate certificate warning
Cannot go back

About this tool

Fake Certificate Warning is a free online fake screen simulator. Simulate browser certificate expired full-screen warning. Prank your friends with convincing fake screens. It runs entirely in your browser — no download or sign-up needed.

After opening it, the browser's certificate warning page is displayed, including prompts such as "Your connection is not a private connection","An attacker may try to steal your information from xxx","NET: ERR_CERT_INVALID". The interface design refers to Chrome's certificate error page.

The entire process is purely front-end animation and will not really detect the status of the certificate. If you want to exit, just press F11 or Esc.

Suitable for tricks, creating panic effects, or as props for Short Video.

False certificate warning, simulating the browser's SSL Certificates error page, displays warnings such as "Your connection is not a private connection" and "NET::ERR_CERT_INVALID".