Opt-in is a term related to data privacy. It means a permission given to marketers or data to use the information about the user or perform other marketing activities.

Opt-in is a legal marketing approach when a marketer asks for users’ permission in order to send them promotional content. Opt-in can be full or partial, which means the user can agree to all or just some marketing activities.

Under GDPR , companies are required to ask for consent for sending any advertising messages unless they are processing personal data on the basis of legitimate interest.

Here’s an example of an opt-in placed on the Piwik PRO website – an additional checkbox in a download form:

More about opt-in on Piwik PRO blog:


  • first party data

    First-party analytics without consent: Your Digital Omnibus compliance guide

    The Digital Omnibus is the European Commission’s simplification initiative to modernize the EU’s digital rulebook and reduce consent fatigue. The framework would enable first-party analytics without consent when specific criteria are met, ending years of uncertainty about the use of legitimate interest for web statistics.

  • University website personalization: First-party data strategies for student recruitment and retention

    University websites receive millions of visits annually from diverse audiences – prospective students, admitted students weighing their options, current undergraduates, graduate students, parents, alumni, and faculty. Yet most institutions serve identical content to all these visitors, missing critical opportunities to engage each audience with relevant information.