Advertising

Onetag

UKUnited KingdomVerified June 2026

Vendor site

Programmatic advertising and header-bidding technology.

Detected by domain patterns

onetag-sys.comonetag.com

European alternatives

Adform (DK)Weborama (FR)

GDPR & Data Residency

Onetag is UK-based. The European Commission renewed its adequacy decision for the UK under GDPR in December 2025, meaning data transfers to the UK are currently treated similarly to intra-EU transfers. Adequacy decisions are time-limited and reviewed periodically, so verify the current status before relying on it for new contracts.