Most people have clicked “Accept All ” on a cookie banner without thinking twice.
Most businesses have added one to their website without fully understanding what it covers. The difference between first-party and third-party cookies is not just technical, it is a compliance question that more businesses need to be asking.
What Cookies Actually Do
A cookie is a small file stored in a user’s browser when they visit a website.
It remembers login details, preferences, items in a shopping cart. On the surface, that sounds harmless.
The question is who placed the cookie there, and what they are doing with the data it collects. That is where first-party and third-party cookies diverge.
- First-party cookies are set by the website the user is actually visiting. They serve the user directly: keeping them logged in, saving their settings, remembering their preferences. The data stays within the website and is generally considered low privacy risk.
- Third-party cookies are set by a different domain, typically an advertising network, analytics platform or social media tool embedded on the page. These cookies follow the user across multiple websites, building a profile of their browsing behaviour that gets passed to external companies. The user is on one website. A third party is watching.
The Compliance Myth of the First-Party Bypass
A common assumption is that switching to first-party data solves the compliance problem.
First-party data still constitutes personal information under the Australian Privacy Act. Collecting it still requires transparency, valid consent and a clear disclosure of how it will be used.
A business that replaces third-party cookies with its own first-party tracking is not automatically compliant. It has simply shifted where the data is collected from, not whether the collection is lawful.
The obligation is the same: businesses must tell users what they are collecting, why, and give them a genuine choice about whether to agree. A cookie banner that makes accepting easier than declining does not meet that standard. Neither does one that buries the detail in a privacy policy nobody reads.
What This Means for Your Business
As third-party cookies are phased out by major browsers, businesses are being pushed toward first-party data strategies. That shift creates new compliance obligations, not fewer. Businesses now need to:
- Clearly disclose what first-party data is being collected and why
- Obtain valid consent before collecting data beyond what is strictly necessary
- Give users a straightforward way to withdraw consent at any time
- Map where that first-party data lives and who has access to it
The end of third-party cookies is not the end of cookie compliance.
For many businesses it is the beginning of a more complex conversation about what data they are collecting directly and whether they are doing it properly.
