Title: ThinkCaptcha – Captcha for Login, Register and WooCommerce Author: ThinkPlugin Published: September 20, 2025 Last modified: September 19, 2026 --- Search plugins ![](https://ps.w.org/thinkcaptcha/assets/banner-772x250.png?rev=3403384) ![](https://ps.w.org/thinkcaptcha/assets/icon-256x256.png?rev=3364986) # ThinkCaptcha – Captcha for Login, Register and WooCommerce By [ThinkPlugin](https://profiles.wordpress.org/thinkplugin/) [Download](https://downloads.wordpress.org/plugin/thinkcaptcha.1.1.9.zip) * [Details](https://srd.wordpress.org/plugins/thinkcaptcha/#description) * [Reviews](https://srd.wordpress.org/plugins/thinkcaptcha/#reviews) * [Installation](https://srd.wordpress.org/plugins/thinkcaptcha/#installation) * [Development](https://srd.wordpress.org/plugins/thinkcaptcha/#developers) [Support](https://wordpress.org/support/plugin/thinkcaptcha/) ## Description ThinkCaptcha adds a simple, effective captcha to the WordPress and WooCommerce forms that get attacked the most, so you can stop spam registrations, brute-force login attempts, and junk submissions. It uses Google’s familiar “I’m not a robot” checkbox (reCAPTCHA v2) and turns it on with a single toggle — no coding needed. The captcha only loads on the pages that actually use it, so it stays light on performance. #### Free features * Captcha on the WordPress login form to slow down brute-force attacks. * Captcha on the WordPress registration and password-reset forms. * Captcha on the WooCommerce login, registration, and password-reset forms. * Loads asynchronously and only where it’s needed. #### ThinkCaptcha Pro Want to protect the rest of your site? [ThinkCaptcha Pro](https://thinkplugin.com/thinkcaptcha-pro/) extends the same captcha to: * The WooCommerce checkout, to help prevent fraudulent and spam orders. * Contact Form 7 and WPForms submissions. * The default WordPress registration form. ### Third-Party Service Disclosure This plugin connects to the Google reCAPTCHA service to tell humans and bots apart. * Service used: Google reCAPTCHA (provided by Google LLC). * What is sent: to verify a visitor is human, the service collects and sends device and application data, along with the visitor’s IP address, to Google. * When it is sent: whenever a protected form is displayed and submitted. * Policies: use of Google reCAPTCHA is subject to Google’s [Privacy Policy](https://policies.google.com/privacy) and [Terms of Service](https://policies.google.com/terms). ## Screenshots [⌊The settings panel with the Pro upgrade section.⌉⌊The settings panel with the Pro upgrade section.⌉[ The settings panel with the Pro upgrade section. [⌊The general settings for entering your Site and Secret keys.⌉⌊The general settings for entering your Site and Secret keys.⌉[ The general settings for entering your Site and Secret keys. [⌊The integrations section, with free features enabled and Pro features available as an upgrade.⌉⌊The integrations section, with free features enabled and Pro features available as an upgrade.⌉[ The integrations section, with free features enabled and Pro features available as an upgrade. [⌊The captcha on the WordPress login form.⌉⌊The captcha on the WordPress login form .⌉[ The captcha on the WordPress login form. [⌊The captcha on a WooCommerce form.⌉⌊The captcha on a WooCommerce form.⌉[ The captcha on a WooCommerce form. ## Installation 1. Upload the `thinkcaptcha` folder to the `/wp-content/plugins/` directory. 2. Activate the plugin through the ‘Plugins’ menu in WordPress. 3. Open the “ThinkCaptcha” menu in your WordPress admin dashboard. 4. Get a Site Key and Secret Key for reCAPTCHA v2 (“I’m not a robot” checkbox) from the [Google reCAPTCHA admin console](https://www.google.com/recaptcha/admin/create). 5. Paste your keys into the plugin’s settings page. 6. Use the toggles to enable the captcha on the forms you want to protect. 7. Save your changes — protection is now active. ## FAQ ### How do I add a captcha to the WordPress login form? After adding your Google reCAPTCHA keys, open the ThinkCaptcha settings page and enable “WordPress – Login Form”. The captcha is added to your login page automatically, which helps protect against brute-force attacks. ### Can I add a captcha to my WooCommerce forms? Yes. You can enable the captcha on the WooCommerce login, registration, and password- reset forms from the settings panel. The WooCommerce checkout is available in the Pro version. ### Does the plugin support Contact Form 7 or WPForms? Contact Form 7 and WPForms are supported in the Pro version. ### What is the difference between a captcha and reCAPTCHA? “Captcha” is the general term for a test that tells humans and bots apart. reCAPTCHA is Google’s version of it, which uses risk analysis for a smoother experience. ThinkCaptcha uses reCAPTCHA v2. ### Does the plugin slow down my site? No. The script loads asynchronously and only on pages where the captcha is active, so it does not block your pages from loading. ## Reviews There are no reviews for this plugin. ## Contributors & Developers “ThinkCaptcha – Captcha for Login, Register and WooCommerce” is open source software. The following people have contributed to this plugin. Contributors * [ ThinkPlugin ](https://profiles.wordpress.org/thinkplugin/) [Translate “ThinkCaptcha – Captcha for Login, Register and WooCommerce” into your language.](https://translate.wordpress.org/projects/wp-plugins/thinkcaptcha) ### Interested in development? [Browse the code](https://plugins.trac.wordpress.org/browser/thinkcaptcha/), check out the [SVN repository](https://plugins.svn.wordpress.org/thinkcaptcha/), or subscribe to the [development log](https://plugins.trac.wordpress.org/log/thinkcaptcha/) by [RSS](https://plugins.trac.wordpress.org/log/thinkcaptcha/?limit=100&mode=stop_on_copy&format=rss). ## Changelog #### 1.1.9 * FIX: The WooCommerce login captcha now blocks login on failed verification (moved to the woocommerce_process_login_errors filter). * FIX: Removed an unreliable page check during wp_loaded that could stop WooCommerce login verification from running. * FIX: The captcha script now loads with proper async/defer attributes via the script_loader_tag filter. * TWEAK: Rewrote the readme and plugin title for clarity and to follow WordPress. org guidelines (removed keyword stuffing). * TWEAK: Updated tested-up-to values (WordPress 7.1, WooCommerce 11.0). * TWEAK: Removed a leftover Poppins font reference from the admin styles. #### 1.1.6 * TWEAK: Tested up to WordPress 6.9. #### 1.1.5 * FIX: Resolved a short-description length warning in readme.txt. * FIX: Resolved a “Tested up to” tag validation error. * FIX: Resolved a translation-loading notice by optimizing text domain calls. * FIX: Added missing translator comments for better I18n compliance. * TWEAK: Removed the Google Fonts dependency for better GDPR compliance; switched to native WordPress admin fonts. * TWEAK: Improved IP detection for sites behind Cloudflare or a proxy. #### 1.1.2 * FIX: Switched to wp_enqueue_script for loading external JavaScript. * FIX: Added nonce checks to all form submissions (CSRF protection). * FIX: Added sanitization and unslashing for all $_POST and $_SERVER inputs. * FIX: Added versioning to enqueued scripts and styles. * FIX: Added isset checks for $_SERVER variables to prevent notices. #### 1.1.1 * FIX: Bundled the Font Awesome library locally to remove external dependencies. #### 1.1.0 * Initial public release. ## Meta * Version **1.1.9** * Last updated **3 days ago** * Active installations **40+** * WordPress version ** 5.5 or higher ** * Tested up to **7.1.1** * Language * [English (US)](https://wordpress.org/plugins/thinkcaptcha/) * Tags * [captcha](https://srd.wordpress.org/plugins/tags/captcha/)[login](https://srd.wordpress.org/plugins/tags/login/) [recaptcha](https://srd.wordpress.org/plugins/tags/recaptcha/)[spam](https://srd.wordpress.org/plugins/tags/spam/) [woocommerce](https://srd.wordpress.org/plugins/tags/woocommerce/) * [Advanced View](https://srd.wordpress.org/plugins/thinkcaptcha/advanced/) ## Ratings No reviews have been submitted yet. [Your review](https://wordpress.org/support/plugin/thinkcaptcha/reviews/#new-post) [See all reviews](https://wordpress.org/support/plugin/thinkcaptcha/reviews/) ## Contributors * [ ThinkPlugin ](https://profiles.wordpress.org/thinkplugin/) ## Support Got something to say? Need help? [View support forum](https://wordpress.org/support/plugin/thinkcaptcha/)