A public, searchable archive of the ads running on a platform. Meta's Ad Library (2019) covers all ads and retains political ads for seven years; Google's Ads Transparency Center, TikTok's Commercial Content Library, and LinkedIn's Ad Library followed. The EU Digital Services Act made a repository mandatory for very large platforms. Ad libraries are the primary tool for competitive creative research.
Related terms
Used in The Signal
Cite this entry:
Agency Echelon. "Ad Library." Agency Echelon Reference, reviewed September 2026. https://agencyechelon.com/reference/glossary/ad-library/