WordPress plugin (ZIP install)

Download plugin ZIP

Use this direct file:

https://captchalink.com/captchalink.zip

How to install (for non-technical users)

1. Open your WordPress Admin.
2. Go to Plugins -> Add New -> Upload Plugin.
3. Select captchalink.zip and click Install Now.
4. Click Activate Plugin.
5. Go to Settings → Captchalink.
6. Set Service base URL (usually https://captchalink.com).
7. Enable CAPTCHA for the forms you want: comments, login, registration, lost password.
8. Optional: enable Contact Form 7 integration on the same settings page (see below).

Contact Form 7 integration

If you use Contact Form 7, you can add Captchalink there too—it is off by default until you enable it.

1. Install and activate the Contact Form 7 plugin (if you have not already).
2. In WordPress go to Settings → Captchalink and check Enable Contact Form 7 integration, then save.
3. Edit your CF7 form and place a named tag where you want the CAPTCHA (same idea as [text your-name]). Example:

   [captchalink captchalink]

   The second word is the field name—you can use another valid name, e.g. [captchalink cf7_captcha].
4. Submissions are checked server-side: if the CAPTCHA is not completed or the token is invalid, CF7 will not show the “message sent” success state.

How verification works

The plugin injects a hidden captcha_token in form submit and verifies it server-side using: /api/verify.php. Default free keys are prefilled in plugin settings.

Troubleshooting

• If CAPTCHA box is visible but empty, check your Service base URL.
• If submit says CAPTCHA required, verify the widget script is loading and token is injected.
• Contact Form 7: use a named tag like [captchalink captchalink], not [captchalink] alone—otherwise CF7 cannot attach a validation error and the form may appear to send.
• If running localhost, keep your WordPress and captchalink.com server reachable from the same environment.