Glossary
Trust Signal
A trust signal is any visual or textual element in an advertisement, landing page, or website that communicates credibility, legitimacy, and safety to a potential customer. Trust signals reduce the perceived risk of taking action — clicking an ad, filling out a form, making a phone call, or completing a purchase — and directly increase conversion rates. Common trust signal categories include third-party verification badges (Google Screened, BBB accreditation, industry certifications), social proof (customer reviews, star ratings, testimonial videos, case study logos), security indicators (SSL certificates, secure payment icons, privacy policy links), authority markers (media mentions, award badges, years in business), and transparency elements (real phone numbers, physical addresses, team photos, clear pricing). In paid media, trust signals are particularly important in YMYL verticals — legal, healthcare, and financial services — where consumer caution is highest. Google's Local Service Ads embed trust signals directly into the ad unit through Google Screened and Google Guaranteed badges, and the presence of review stars can significantly increase click-through rates on both paid and organic listings. CRO practitioners systematically test different trust signal placements and combinations to identify the configuration that maximizes conversion rate for each audience segment.