First-id

The company operates an adtech identity platform that creates deterministic, anonymous first-party identifiers for advertising use. It connects to publishers, advertisers and e-commerce merchants via tags or server-side integrations, then exposes identifiers to SSPs, DSPs, DMPs and clean rooms for targeting, frequency management and measurement. Value is created by preserving user-level addressability and campaign performance in a cookieless, privacy-regulated environment while keeping control with first-party data owners. Scale is achieved through integrations across many publisher sites and advertisers, which increases match rates and utility for all participants in the advertising ecosystem.

First-id.fr is a French adtech company providing a privacy-compliant, deterministic first-party identifier solution for digital advertising. Its technology generates precise, persistent and anonymous user identifiers based on strong first-party signals, to replace third-party cookies and enable cross-domain and cross-device addressability for advertising use cases.

The company primarily serves publishers, advertisers and e-commerce players, integrating with major adtech platforms, data platforms and data clean rooms for activation and measurement. It generates revenue through SaaS licences priced according to the number of sites and audience volume, with deployments already spanning hundreds of media and advertiser partners in France.