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I don't get why, when and how Google uses reCAPTCHA within their own tools. E.g. within the Webmaster Tools, I can submit up to 500 URLs for manual fetch/render and subsequent index submission. So the rate limit is already there and reasonable.

However, after 4 submitted URLs, I get a reCAPTCHA. From then on for every URL, I have to complete it with additionaly visual quizzes.



Another way they get triggered is when people use browser/desktop based rank checkers.

There are also plugins some SEOs use to pull lots of requests. These tools are quite old now and not very useful, but people still use them.


Google recently killed off its page rank toolbar - which most people in SEO used to measure their success with the sites they worked on.

Google has confirmed it is removing Toolbar PageRank: http://searchengineland.com/google-has-confirmed-they-are-re...


Thanky you. I indeed han a chrome extension doing this. Removed and will check!


> I don't get why, when and how Google uses reCAPTCHA within their own tools.

This may or may not help with your quest.

Google triggers recaptcha when i use their search using one of my digitalocean servers as vpn and incognito mode, thus my IP address belongs to a datacentre, there isn't a cookie header and the user-agent is linux.


I am on OVH, and never get a reCAPTCHA.

(I used to use my OVH VPS for some time as VPN, so it has gained quite a reputation for a "normal" browsing history)


Thank you - I am using it absolutely genuine. The used account is in fact linked to an AdWords account which has spendings in the five digits...


I had the same thing the other day. I figured maybe it was because I was in incognito mode (because logging into half of Google's properties with uBlock and Privacy Badger enabled doesn't work). sigh




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