Why do I keep getting CAPTCHAs?

Usually because of your IP (shared, hosting, VPN or flagged), unusual browser settings, blocked cookies or JavaScript, or browsing very quickly. Many people sharing one IP also raises the rate.

Do proxies cause CAPTCHAs?

Poor ones do. Datacenter and overused shared IPs are challenged often. Clean residential, ISP and mobile IPs used at a normal pace see far fewer.

What is reCAPTCHA v3?

Google's invisible CAPTCHA. It shows no puzzle and returns a score from 0.0 (likely bot) to 1.0 (likely human), and the site decides what to do with it.

What is the difference between reCAPTCHA and hCaptcha?

Both are third-party challenge services with checkbox and image tasks. reCAPTCHA is Google's; hCaptcha is an independent alternative, used by sites that prefer not to rely on Google.

Why do CAPTCHAs come back after I change IP?

The clearance from a solved challenge is often bound to the IP and browser that solved it. A new IP looks like a new visitor, so use sticky sessions for flows that need continuity.

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What Is a CAPTCHA?

A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a challenge a website shows when it is not sure a visitor is human. It ranges from typing distorted text or picking images to invisible checks that score the browser without asking anything.

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how it works

How CAPTCHAs work today

The term was coined in 2003 by researchers at Carnegie Mellon. Early CAPTCHAs relied on puzzles humans solve easily and computers don't. As machine vision caught up, most systems moved to risk scoring: they collect signals about the browser, the IP and the visit, and only show a visible puzzle when the score is doubtful.

1
Text
What the visitor sees
Distorted letters to type
Examples
Older forms and legacy sites
2
Image or checkbox
What the visitor sees
A tick box, sometimes followed by an image grid
Examples
reCAPTCHA v2, hCaptcha
3
Invisible score
What the visitor sees
Nothing; the site gets a score from 0.0 to 1.0
Examples
reCAPTCHA v3
4
Managed challenge
What the visitor sees
A brief check page, rarely any puzzle
Examples
Cloudflare Turnstile and challenge pages

why it matters

Why CAPTCHAs matter for proxy users

CAPTCHAs are the visible end of bot detection. How often you see them says a lot about how a site rates your IP and client.

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CAPTCHA: what it means for you

IP reputation drives the rate. Hosting ranges and IPs with a history of abuse get far more challenges than clean consumer IPs; see IP reputation.
Clearance often sticks to the session. Passing a challenge typically sets a cookie tied to that browser and often to that IP, so rotating the IP mid-session can bring the challenge back.
Speed and volume trigger them: many requests per minute from one IP look automated however clean it is.
Treat a rising CAPTCHA rate as a signal to slow down and review your setup. Automated solving services exist, but many sites' terms forbid them.

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