First-party data is data you collect directly from your own website visitors or customers — through contact forms, account sign-ups, purchase records, on-site behaviour tracking, or surveys. Because it comes straight from the user, it is more accurate and valuable than data bought from third parties.  Under GDPR, first-party data is not automatically exempt from the rules. You still need a valid legal basis to collect and use it.

The most common legal bases are:

Consent (the user actively agrees), legitimate interest (you have a clear and proportionate business reason), and contractual necessity (the data is needed to deliver a service the user signed up for). 

What this means for marketers:

You can build audience segments, personalise content, and run email campaigns using first-party data — but you must be transparent about how you use it, and you must not use it beyond the purpose users agreed to.  The best foundation is collecting first-party data through a proper consent process.

Seers.ai helps you collect first-party data in a GDPR-compliant way — managing consent at the point of collection, blocking scripts for users who decline, and keeping a clear audit trail of all consent decisions so you always have proof of compliance.