---
title: "How do I opt out of the Google FLoC network?"
url: "https://ploi.io/documentation/domains/how-do-i-opt-out-of-the-google-floc-network"
published: "2021-06-06"
last_updated: "2026-06-15"
---

# How do I opt out of the Google FLoC network?

FLoC (Federated Learning of Cohorts) was an experimental tracking mechanism Google trialled in Chrome. **Google discontinued FLoC in 2022** and replaced it with the Topics API, so the old opt-out is no longer necessary.

Historically you could opt out by sending a `Permissions-Policy: interest-cohort=()` response header. Because FLoC has been removed from Chrome, this header now does nothing — it is harmless if you already have it, but there is no need to add it to new sites.

The newer Topics API cannot be disabled with a single response header the way FLoC could; it is governed by the user's browser settings and the Privacy Sandbox. For general privacy and security hardening, focus on a solid Content-Security-Policy and the standard security headers instead.