Web-to-Lead: reCAPTCHA Web Form Validation

Frustrate spammers and improve the quality of your sales teams’ leads with the reCAPTCHA widget. The reCAPTCHA widget requires interested customers to select a checkbox before they can submit an inquiry about your product. Enabling spam filtering lets sales reps focus on actual prospects, and not on spam leads.
Available in: Salesforce Classic and Lightning Experience
Available in: Professional, Enterprise, Performance, Unlimited, and Developer Editions

Web-to-Lead form with reCAPTCHA