Can I add Captcha plugin to Contact Form plugin?

Captcha is compatible with Contact Form by BestWebSoft. After you downloaded, activated and configured Contact Form plugin, go to Captcha settings page, find “External plugins” section and mark “Contact Form” checkbox. Don’t forget to click “Save Changes” button.

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Additional articles:

Add Captcha plugin to a custom form on my WordPress website

Add Captcha plugin to Contact Form 7