HACKER Q&A
📣 samuel246

How Google recaptcha v3 works?


The recaptcha v3's documentation doesn't reveal much about how it works.

I'm just curious about the recaptcha v3's tracking and analytics flow.

Does the tracking and analytics being processed in the client side, or are those tracking data passed to the google servers and being processed there? If those tracking data are passed to their servers, what kind of data is that?

  👤 vmoore Accepted Answer ✓
The code is kinda creepy. I inspected it with devtools and it was sending enormous amounts of data to Google. They look at everything. Screen resolution, time taken to complete the captcha, and various other browser fingerprints, so that next time they know it's 'you' and the CAPTCHAS aren't as hard, or they simply let you in without having to complete another CAPTCHA because they've successfully fingerprinted your browser.
👤 spxd
We all should move to https://www.hcaptcha.com/ or any other provider who is not Google.

They are spying on all.