skip to Main Content


The Universal ID For The Advertising Industry

Coverage of a 3rd party ID
and persistence of 1st party

Community Owned

SharedID, is managed by’s Publisher members. A free identity solution owned by the community rather than a vendor, delivers the trust and transparency required for widespread adoption across publishers and DSPs.

1st and 3rd Party

Publishers can write the SharedID common identifier as either a first-party or third-party value. SharedID includes Publisher Common ID, a widely used first-party identifier that stores a unique user ID in the first party domain and makes it accessible to all bid adapters.

Preparing For A
Cookieless Internet

With SharedID, cookie syncing becomes unnecessary as every party in the ecosystem will utilize the same shared identifier. The industry will finally be freed from the reliance on hundreds of cookies, greatly reducing the overall identifier footprint.

Better Targeting.
Better Privacy.

SharedID improves user matching, including iOS and MacOS browsers, and is compatible with ITP (Intelligent Tracking Prevention). SharedID has a single-point opt-out to give consumers full control over their privacy and their advertising preferences.


Replace your proprietary value and use SharedID for sandboxing.

Other Products

Prebid Server – open-source solution for server-to-server header bidding with Prebid.js and Prebid Mobile.

Prebid Mobile – open-source library that provides an end-to-end header bidding solution for mobile app publishers.

Back To Top