How to Identify FunCaptcha | By using CapSolver Extension

How to Identify FunCaptcha | By using CapSolver Extension

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What is FunCaptcha?

Funcaptcha integrates various advanced technologies to enhance security and usability, including:

  • Behavioral Analysis: It monitors the user's behavior during the challenge, such as mouse movements and click patterns, to distinguish between humans and bots.
  • Dynamic Challenges: The challenges are continuously updated and vary each time, making it harder for bots to learn and solve them.
  • Adaptive Mechanisms: The system adapts the difficulty of the challenge based on the user's risk profile and behavior, ensuring minimal disruption for legitimate users.
  • Device Fingerprinting: It collects and analyzes device and browser information to identify potential threats.
  • Machine Learning: Utilizes machine learning models to analyze vast amounts of data and improve the accuracy of distinguishing between human and automated traffic.

How to Identify if FunCaptcha is being used Using CapSolver Extension

In addition to finding the FunCaptcha Site Key, it is sometimes necessary to determine whether the FunCaptcha is being used.

Steps to Start Detecting FunCaptcha Parameters:

  1. Installation:

  2. Capsolver Setup:

    • Visit CapSolver.
    • Press the "F12" key on your keyboard to open the developer tools.
    • Navigate to the tab labeled Capsolver Captcha Detector.
  3. Detection:

    • Without closing the Capsolver panel, visit the website where you intend to trigger the CAPTCHA.
    • Trigger the captcha.
    • Remember: Do not close the Capsolver panel before triggering the CAPTCHA.

CAPTCHA Parameter Detection:

Identifiable Parameters for FunCaptcha:

  • Website URL
  • Site Key
  • funcaptcha
  • funcaptcha api js subdomain
  • data blob

Once the CAPTCHA parameters have been detected, CapSolver will return a JSON detailing how you should submit the captcha parameters to their service.

How to Identify if FunCaptcha is being used:

  1. Open Developer Tools:
    Press F12 to open the developer tools or right-click on the webpage and select "Inspect".

  2. Open the CapSolver Panel:
    Go to the Captcha Detector Panel

  3. Trigger the FunCaptcha:
    Perform the action that triggers the FunCaptcha on the webpage.

  4. Check the CapSolver Panel:
    Look at the CapSolver Captcha Detector tab in the developer tools. If the parameter FunCaptcha is set to true, then the FunCaptcha on the site is being used.
    If it's FunCaptcha , will appear like:

By following these steps, you can easily determine if the FunCaptcha on a website is being used.


Identifying whether a FunCaptcha is being used using the CapSolver extension is straightforward. CapSolver not only helps you find the site key but also other essential parameters like if FunCaptcha is being used. Always use such tools responsibly and ethically, respecting the terms of service of the websites you interact with. For more assistance, you can contact CapSolver via email at [email protected].