All Ad Specs

All Ad Specs provides a free reference of digital ad specifications, detailing sizes, aspect ratios, file limits, durations, copy limits, and safe zones for hundreds of ad formats from dozens of publishers. Every specification is directly linked to the publisher's official documentation. The platform covers dozens of publishers across social, video, connected TV, retail media, display, audio, and digital out-of-home channels, ranging from major networks like TikTok, Meta, and YouTube to Amazon Ads, Spotify, and standard IAB display formats.

Users can also utilise the built-in Ad Specs Tester to check image, video, audio, or HTML5 zip files against any placement directly in the browser without needing to upload files. An automated check re-reads each official source once a month to flag changes for review before updates are applied, and each publisher page displays when its specifications were last verified. Every specification is free to browse without an account, and the tester offers free daily checks with additional capacity available through a free account.

It suits media planners, creative teams, and digital advertisers who need accurate, up-to-date technical requirements for campaign execution.