Google reCAPTCHA and Data Protection – What Website Operators Need to Know

If a website operator uses Google reCAPTCHA, it processes end-device data, interaction data and technical telemetry data for the purpose of bot defense and security on the basis of legitimate interests (Art. 6(1)(f) GDPR) or consent (Art. 6(1)(a) GDPR), depending on the type of implementation. Google reCAPTCHA is a security service provided by Google that prevents bot traffic and abuse on websites.

A. Purpose and Function of Google reCAPTCHA

Google reCAPTCHA is a security service provided by Google Ireland Limited. The system checks whether a user is a real human or an automated program (bot). It offers website operators protection against automated attacks, spam, fraud and other abuse scenarios.

Google offers two main versions:

reCAPTCHA v2 displays a visible "I'm not a robot" button with a checkbox to the user. The user must actively click. If necessary, additional image recognition puzzles are displayed.

reCAPTCHA v3 loads invisibly in the background and analyzes user behavior (mouse movements, keyboard patterns, browser data) without the user having to do anything. The system assigns a "Risk Score" that the website operator can use to block suspicious requests.

Integration function: reCAPTCHA is integrated into the website via a JavaScript tag. When the page loads (v3) or when the button is clicked (v2), the script is executed, which collects data and transmits it to Google servers.

B. Mandatory Disclosures in the Privacy Policy regarding reCAPTCHA

The GDPR requires the following mandatory disclosures for the use of Google reCAPTCHA: purposes of the processing (Art. 13(1)(c) GDPR), legal bases (Art. 13(1)(c) GDPR), in the case of Art. 6(1)(f) additionally the specific legitimate interests pursued (Art. 13(1)(d) GDPR), recipients or categories of recipients (Art. 13(1)(e) GDPR), third-country transfers (Art. 13(1)(f) GDPR) as well as the retention period or the criteria thereof (Art. 13(2)(a) GDPR).

reCAPTCHA should not be treated as an isolated text block in the privacy policy. The widespread practice of providing a separate section for each tool used produces long, confusing and difficult-to-maintain texts – and contradicts the transparency requirement of Art. 12(1) GDPR. A more appropriate approach is a topic-oriented one that addresses reCAPTCHA under "Security and abuse protection" or with contact forms and lists Google Ireland Limited in the recipient annex.

C. Provider of Google reCAPTCHA: Google Ireland Limited

Provider: Google Ireland Limited (for German website operators)

Full address: Gordon House, Barrow Street, Dublin 4, Ireland

Country of registered office: European Economic Area (EEA), Ireland

According to the provider, Google Ireland Limited acts as controller for EU customers. The actual data processing is carried out by Google LLC (Mountain View, California, USA).

Data Privacy Framework (DPF): According to the provider, Google LLC is certified under the EU-US Data Privacy Framework. Verification at: https://www.dataprivacyframework.gov/participant/5780

Provider's privacy policy: https://policies.google.com/privacy

Data Processing Agreement (DPA): According to the provider, from April 2026 Google is to act as a processor for reCAPTCHA, meaning a DPA will be required. Website operators should check whether and how Google provides corresponding DPA documents. The details are to be verified by the operator.

D. Data Processing by Google reCAPTCHA – Process

E. Data Collected when Using Google reCAPTCHA

reCAPTCHA collects different data depending on the version. With v2: IP address, browser information, device type, timestamp, cookies (e.g. _GRECAPTCHA). With v3 additionally: mouse movements, mouse pointer position, keystrokes, click patterns, touch movements, scrolling behavior and other behavioral data.

This data can be classified into the following standardized data type categories:

• Web server log data: IP address, time zone, user agent, browser version, operating system
• End-device data: device type, operating system, screen resolution, orientation
• Browser information: browser name, browser version, language, installed extensions
• Coarse location data: coarse location determined from the IP address
• Interaction data: mouse movements, keystrokes, click patterns, mouse pointer position, touch movements, scroll movements (v3)
• Technical telemetry data: browser performance metrics, loading times, technical data for anomaly detection

F. Purposes of Use when Using Google reCAPTCHA

The website operator uses reCAPTCHA to secure its website against automated attacks, spam and abuse. According to the provider, Google LLC uses the collected data to improve the reCAPTCHA service and to optimize bot detection.

The purposes can be classified as follows:

• Functional provision: provision of captcha functionality, bot detection
• Security and abuse protection: prevention of bots, anti-spam, fraud prevention, DDoS defense
• General product improvement: improvement of the reCAPTCHA detection algorithm

G. Legal Bases for Google reCAPTCHA

Google reCAPTCHA falls into the category Captcha / Security and abuse protection. The relevant legal basis varies depending on the version:

reCAPTCHA v2: Typically, legitimate interests (Art. 6(1)(f) GDPR) come into consideration as the legal basis – specifically: abuse protection and security. A balancing of interests must be carried out: are the data collected necessary and proportionate for abuse protection?

reCAPTCHA v3: Since v3 analyzes behavior in the background, consent (Art. 6(1)(a) GDPR in conjunction with § 25(1) TDDDG) typically comes into consideration for this version.

In any case, the specific legal basis is to be examined by the website operator on a case-by-case basis.

H. Special Features and Notes regarding Google reCAPTCHA

• v2 vs. v3: v2 is transparent for users (visible checkbox); v3 analyzes behavior invisibly in the background. The data protection assessment may differ.
• Data Privacy Framework (DPF): According to the provider, Google LLC is DPF-certified. Verification at: https://www.dataprivacyframework.gov/participant/5780
• DPA: Website operators should check whether and when Google offers a DPA for reCAPTCHA.
• Privacy-friendly alternatives: For website operators looking for an alternative without third-party tracking, Friendly Captcha is an option, for example (proof-of-work approach, no behavioral tracking, servers in the EU).

I. FAQ regarding Google reCAPTCHA

J. Conclusion and Recommendation regarding Google reCAPTCHA

Google reCAPTCHA is a widely used security service that effectively protects websites against bots. The data protection classification depends largely on the version used: with v2, legitimate interest comes into consideration; with v3, typically consent. According to the provider, the data is transferred to the USA under DPF certification.

It makes little sense to include reCAPTCHA as a separate text block in the privacy policy. This produces long, confusing and difficult-to-maintain texts and contradicts the transparency requirement of Art. 12(1) GDPR. A more appropriate approach is a topic-oriented one that classifies reCAPTCHA under "Security" or with contact forms and lists Google Ireland Limited in the recipient annex. This is exactly the methodology pursued by the matterius generator.