The Ads Library is a public, searchable database of the advertisements running across Meta's apps: Facebook, Instagram, Messenger, Threads, WhatsApp and the Audience Network. Meta's own name for it is the Ad Library; "Ads Library" is the common variant used by marketers and the trade press. Anyone can search it without logging in and see the creatives a Page is running, when each began and where it appears. For ads about elections, politics and social issues, and for any ad shown in the European Union (EU), it adds spending, reach and targeting data. It exists because of a political crisis. After Russian-linked accounts bought Facebook ads during the 2016 US presidential election, and after the Cambridge Analytica revelations of March 2018, Facebook needed a way to show regulators and the public who was paying to reach whom.

The term also works generically: Google, TikTok, LinkedIn, Microsoft and X run comparable repositories, and EU law obliges the largest platforms to keep one. Meta's version is the reference point here.

What a search returns

Every ad in the library carries a Library ID, the Page that ran it, the creative (with each version tested), a start date, the platforms it ran on, and whether it is still active. Since December 22, 2025, ads under 100 impressions carry a "Low impression count" label, and WhatsApp became a platform filter at the same time.

Beyond that, depth depends on the ad's category and location, according to Meta's reference for the Ad Library API. For political and issue ads, the library shows a "Paid for by" disclaimer (the bylines field), spend, impressions, the age and gender split of the people reached, the share of delivery by region and an estimated audience size. Spend and impressions are not exact: spend is reported in bands from under 100 to over 1 million in the advertiser's currency, and impressions in bands from under 1,000 to over 1 million. For ads delivered in the EU, whatever their subject, the API adds the targeting the advertiser selected (ages, genders and included or excluded locations), an estimated total reach across the EU, and the declared beneficiary and payer. Targeting fields are also returned for UK ads and for political ads delivered to Brazil.

Political and issue ads are kept for seven years, EU ads for a year, according to Nick Clegg, Meta's then president of global affairs, and other ads only while active. API access requires a developer account and identity confirmation, and queries filter by country through the ad_reached_countries parameter.

From political archive to every active ad

Facebook launched its Archive of Ads with Political Content on May 24, 2018, covering election and issue ads in the US on Facebook and Instagram. Advertisers had to verify identity and location, and the archive promised to keep ads for seven years. Rob Leathern, then director of product management, also promised an API for outside researchers.

On March 28, 2019, the US Ad Archive was renamed the Ad Library and widened to every active ad from every Page, political or not. Page details followed, including name changes and the primary country of the people managing large Pages. By then political transparency tools were live in the US, the UK, Brazil and India, with the EU added before the May 2019 European Parliament election.

The EU's Digital Services Act (DSA) produced the next expansion. Article 39 requires very large online platforms and search engines (each with more than 45 million monthly EU users, as the explainer on VLOPs sets out) to publish an ad repository searchable by multiple criteria and through APIs. It must hold each ad's content, the person on whose behalf it ran, the payer if different, the dates, the main targeting parameters including exclusions, and total reach with a breakdown by member state, for a year after last display. Meta extended the Ad Library to all ads targeting the EU in August 2023, as the obligations took effect.

The equivalents elsewhere

Google announced its Ads Transparency Center on March 29, 2023, as a searchable hub of ads from verified advertisers across Search, YouTube and Display, according to a post by Alejandro Borgia, a director of product management for ads safety. PPC Land's own deep dive into the centre dates its origins to 2019, when it covered only political ads, while Google's 2023 post presents the centre as new and building on earlier advertiser-transparency efforts. The two accounts differ on the starting date. Google's centre keeps political ads for up to seven years and other ads for 365 days, with new ads typically appearing 48 to 72 hours after first display. In May 2025, Google said it would show the payer behind each ad, separating agencies from the clients that fund campaigns, and in October 2025 it added a political ads tab.

TikTok opened its Commercial Content Library on July 20, 2023, covering paid ads and branded content in Europe, with the main targeting parameters and the number of people reached. Microsoft created an Ad Library for European users in August 2023, Courtney Gregoire, its chief digital safety officer, wrote at the time, and LinkedIn followed with its own. PPC Land counted 15 platform repositories in March 2025, from Amazon and Pinterest to Booking.com and Zalando, most of them prompted by the DSA.

Why marketers use it

For advertisers, the library is a free view of competitors' creative. A search shows how many variants a rival is testing, which formats it favours and, from the start dates, which ads have survived long enough to suggest they work. Paid "ad spy" tools are built on top of it. Journalists track election spending with it, regulators look for fraud, and brands look for impersonators.

That last use has grown more contested. Reuters reported in November 2025 that Meta's internal documents projected about 10% of 2024 revenue, roughly $16 billion, from ads for scams and banned goods. The library is the main public window onto that inventory.

Gaps, ranges and disputes

The most persistent criticism is that the data is coarse. Banded spend cannot be totalled accurately, and outside the EU and politics there is no spend or reach data at all. Mozilla said in October 2019 that the API, released that March, met only two of five minimum guidelines set by researchers, and called it "fundamentally flawed".

Access has also been fought over. On August 3, 2021, Facebook disabled the accounts of researchers behind New York University's Ad Observatory, which gathered ads through a browser extension, citing its privacy order with the Federal Trade Commission (FTC). Samuel Levine, acting director of the FTC's Bureau of Consumer Protection, replied on August 5, 2021 that "the consent decree does not bar Facebook from creating exceptions for good-faith research in the public interest." Meta closed CrowdTangle, its tool for tracking organic posts, on August 14, 2024, pointing researchers to the Meta Content Library instead. In October 2025 the European Commission preliminarily found that Facebook, Instagram and TikTok hindered researcher access to public data.

The repositories themselves have been sanctioned. On December 5, 2025, the Commission fined X EUR 120 million in its first DSA non-compliance decision, partly because X's ad repository omitted ad content, topics and the paying entity and suffered long processing delays.

The sharpest dispute concerns integrity. Reuters reported in December 2025 that Meta staff, worried that Japan would mandate advertiser verification in 2024, repeatedly ran the searches Japanese users made and deleted the fraudulent ads they surfaced, so that problematic content would be "not findable" by regulators and journalists. Andy Stone, a Meta spokesperson, told Reuters that suggesting this was misleading was "disingenuous". The Consumer Federation of America cited the episode in an April 2026 lawsuit against Meta over scam ads.

Coverage can also shrink by policy. When Meta stopped political and issue ads in the EU on October 6, 2025, ahead of the Transparency and Targeting of Political Advertising (TTPA) regulation, the most detailed EU category in its library stopped receiving new entries. And on May 24, 2025, the first political ads archived in 2018 began leaving the library as the seven-year period expired.

Not the same as

Ad server. An ad server decides which ad to deliver in a given slot and counts the result. The library delivers nothing; it records ads after the fact.

Creative or asset library. The media libraries inside Ads Manager or Google Ads store an advertiser's own images and videos for reuse. They are private.

Ad archive. "Ad Archive" was the library's US name until March 2019. The phrase also describes historical collections of print and broadcast advertising.

Google Ads Transparency Center. Google's equivalent, with longer retention for non-political ads (365 days) but no general targeting data outside the EU. The Ads Library is not a Google product.

The repository duty is a DSA rule, not one of the gatekeeper obligations in the Digital Markets Act. And Meta's April 2026 policy requiring ad-buying platforms to disclose Meta spend to clients is private reporting, not public transparency.

Recent developments

IAB Sweden expelled Meta in March 2026 over deceptive ads. In the EU, the Commission adopted Implementing Regulation (EU) 2026/818 on April 9, 2026, defining a central European repository for political ads that its July 2025 guidance had foreshadowed; as of October 2026 the Commission had published no launch date. And today PPC Land reported that Meta will block new US political ads from October 27 to November 3, 2026, a window in which the library's low-impression labels help show whether a late ad started before the cut-off.

Timeline

  • 2016 - Russian-linked accounts buy Facebook ads during the US presidential election.
  • March 2018 - The Cambridge Analytica revelations intensify pressure for ad transparency.
  • May 24, 2018 - Facebook launches its archive of US political and issue ads on Facebook and Instagram, with seven-year retention.
  • March 28, 2019 - The Ad Archive becomes the Ad Library and covers all active ads; API access expands.
  • October 31, 2019 - Mozilla calls the Ad Library API "fundamentally flawed".
  • August 3, 2021 - Facebook disables the accounts of NYU Ad Observatory researchers.
  • August 5, 2021 - FTC official Samuel Levine rejects Facebook's consent decree justification.
  • March 29, 2023 - Google announces the Ads Transparency Center.
  • July 20, 2023 - TikTok launches its Commercial Content Library in Europe.
  • August 2023 - DSA obligations take effect for very large platforms; Meta archives all EU-targeted ads for a year; Microsoft and LinkedIn launch ad libraries.
  • March 13, 2024 - Regulation (EU) 2024/900 on political advertising is adopted.
  • August 14, 2024 - Meta shuts down CrowdTangle.
  • May 2025 - Google announces payer names in its Ads Transparency Center.
  • May 24, 2025 - Meta's first archived political ads begin expiring after seven years.
  • October 6, 2025 - Meta stops political and issue ads in the EU.
  • October 10, 2025 - Most TTPA provisions apply.
  • October 2025 - Google adds a political ads tab to the Ads Transparency Center.
  • November 6, 2025 - Reuters reports Meta's internal scam ad revenue projections.
  • December 5, 2025 - The European Commission fines X EUR 120 million, partly over its ad repository.
  • December 22, 2025 - Meta adds a WhatsApp filter and low impression count labels.
  • December 2025 - Reuters reports Meta scrubbed Ad Library searches made by Japanese users.
  • March 11, 2026 - IAB Sweden expels Meta.
  • April 9, 2026 - The Commission adopts Implementing Regulation (EU) 2026/818 on the European political ads repository.
  • April 21, 2026 - The Consumer Federation of America sues Meta over scam ads.
  • October 27, 2026 - Meta's pre-midterm block on new US political ads is scheduled to begin.

Summary

Who. Meta operates the Ads Library; Google, TikTok, Microsoft, LinkedIn, X and other large platforms run equivalents. Its users include advertisers and agencies studying competitors, journalists, academic researchers, brands hunting impersonators, and regulators such as the European Commission.

What. A public, searchable archive of ads running on Meta's apps, with creative, dates and platforms for all active ads, and banded spend, impressions, demographics and, in the EU, targeting, reach and payer data for regulated categories, plus an API for programmatic queries.

When. Launched for US political ads on May 24, 2018, widened to all active ads on March 28, 2019, and extended to all EU-targeted ads in August 2023 under the DSA, with updates continuing through December 2025.

Where. At Meta's Ad Library website and API, covering Facebook, Instagram, Messenger, Threads, WhatsApp and the Audience Network, with the richest data for the EU, the UK, Brazil and political ads in markets where Meta accepts them.

Why. It was built to answer who paid to reach whom after the 2016 election and the Cambridge Analytica scandal, and EU law now requires it. Its limits, from banded figures to research access fights and the alleged scrubbing of scam ads, are why its reliability remains disputed.