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You (probably) dont need ReCAPTCHA | kevv.net

Googles ReCAPTCHA is often the first tool that many webmasters reach for when confronted with the need to stop spam and automated malicious traffic from harming their services. In this post I explain several reasons why ReCAPTCHA is usually not the best solution to use for this purpose, as it is often unnecessary, inconveniences users, and subjects users to intensive tracking and fingerprinting that they are not able to opt-out of. Several alternative solutions to ReCAPTCHA for various threat models are presented as well as best practices for implementing captchas in general.