Developer blog
FedCM updates: Filtered out accounts UI change in Chrome 133
Introducing a new FedCM UI for displaying filtered out accounts in Chrome 133.
- Federated Credential Management API
- Web
- Privacy Sandbox
February 6, 2025
HTTP headers support for the Storage Access API
Chrome 133 introduces support for Storage Access HTTP headers
- Storage Access API
- Web
- Blog
- JavaScript
- Privacy Sandbox
January 29, 2025
Storage Partitioning deprecation trial renewal
For sites that need time to adjust to third-party partitioning of storage, service workers, and communication APIs, the deprecation trial has been extended once more to allow them to temporarily keep their third-party storage, service workers, and communication APIs unpartitioned.
- Privacy Sandbox
January 6, 2025
Shared Storage and Select URL updates: cross-origin worklets, and saved queries
Chrome introduces Shared Storage updates including support for cross-origin worklet scripts and updates to the Select URL API with Shared Storage in Chrome 132 with the support of saved queries.
- Shared Storage API
- Web
- JavaScript
- Privacy Sandbox
December 18, 2024
FedCM updates: Mode, Use Other Account, and Continuation features in Chrome 132
Chrome 132 introduces multiple FedCM updates including the Mode API for better user control and the Continuation API for flexible multi-step sign-in flows.
- Federated Credential Management API
- Web
- Privacy Sandbox
December 10, 2024
User-Agent Reduction on Android WebView
Android WebView will take the next step in reducing the information available in the User-Agent string, to improve privacy for users. With this change, websites and services that rely on the User-Agent string for certain information may need to take action. This post gives some background on what's happening, why WebView is making this change, and what you can do to prepare.
- Privacy Sandbox
December 6, 2024
Partitioned Popins: a new approach to Web pop-ups in Developer Trial
From Chrome 132, developers can participate in a Developer Trial for Partitioned Popins, a new approach to web pop-ups.
- Web
- Blog
- Privacy Sandbox
November 20, 2024
FedCM: A trust signal for the Storage Access API in Chrome 131
Chrome 131 integrates the Storage Access API with FedCM, where FedCM is used as a trust signal to automatically grant storage access.
- Federated Credential Management API
- Storage Access API
- Web
- Blog
- Privacy Sandbox
November 15, 2024
Validating the security of the Aggregation Service
Sharing updates on the Aggregation Service coordinators, and results of an independent security assessment.
- Privacy Sandbox
November 14, 2024
Origin trial for HTTP header support in Storage Access
Chrome 130 starts an origin trial for HTTP headers logic for Storage Access API.
- Storage Access API
- Web
- Blog
- JavaScript
- Privacy Sandbox
October 14, 2024
Third-party cookie site compatibility lookup tool
Chrome is providing a lookup service to show how third-party cookie availability is affected by Chrome's third-party cookie grace period, and grace period opt-out configuration.
- Privacy Sandbox
October 8, 2024
Topics API: User controls on Chrome – Proactive Topic Blocking
Chrome's Topics API update lets users proactively block ad topics, giving them more control over their ad experience.
- Web
- Privacy Sandbox
September 9, 2024
Updates to temporary third-party cookie exceptions in Chrome
Chrome is extending the grace period that allows sites and services demonstrating user-facing, non-ads breakage to continue to access third-party cookies.
- Privacy Sandbox
August 26, 2024
FedCM updates: Multi IdP API on desktop, Button Mode API and Continuation Bundle for Chrome on Android origin trials
Chrome 128 starts an origin trial for Multi IdP API on desktop, as well as origin trial for the Button Mode API and Continuation Bundle features for Chrome on Android.
- Federated Credential Management API
- Web
- JavaScript
- Privacy Sandbox
July 24, 2024
An opt-out mechanism for the third-party cookie deprecation trial grace period
For sites taking part in either of the third-party cookie deprecation trials, Chrome provides a grace period to temporarily re-enable third-party cookies. During the grace period, sites can access third-party cookies in Chrome, even if they haven't yet deployed trial tokens. Chrome is now providing a mechanism to allow sites to opt out of the grace period for a percentage of users.
- Privacy Sandbox
June 14, 2024
FedCM updates: Origin trials for the Continuation API bundle and Storage Access API auto-grant
Chrome 126 starts origin trials for the Continuation API bundle and Storage Access API auto-grant
- Federated Credential Management API
- Web
- JavaScript
- Privacy Sandbox
June 11, 2024
Chrome's third-party cookie deprecation trials: changes to the grace period
From July 1, 2024, sites and services that have registered for one of the third-party cookie deprecation trials will receive a grace period of 60 days to deploy trial tokens, starting from the date their trial registration was approved.
- Privacy Sandbox
June 10, 2024
Storage Partitioning deprecation trial renewal
For sites that need time to adjust to third-party partitioning of storage, service workers, and communication APIs, the deprecation trial has been extended to allow them to temporarily keep their third-party storage, service workers, and communication APIs unpartitioned.
- Privacy Sandbox
May 25, 2024
Privacy Sandbox at Google I/O 2024
The Privacy Sandbox team was at Google I/O 2024 to share the latest news on third-party cookie deprecation
- Privacy Sandbox
May 23, 2024
FedCM updates: Button Mode API origin trial, CORS and SameSite
Chrome 125 starts an origin trial for Button Mode API and updates to CORS and SameSite.
- Federated Credential Management API
- Web
- JavaScript
- Privacy Sandbox
April 17, 2024
Chrome's third-party cookie deprecation trials: grace period extended
The grace period for Chrome's third-party cookie deprecation trials is being extended until June 30, 2024.
- Privacy Sandbox
March 13, 2024
FedCM updates: Domain Hint API
Chrome 123 introduces FedCM Domain Hint API. With the Domain Hint API, developers may provide a better UX by only showing the federated login accounts from the domain that they accept.
- Federated Credential Management API
- Web
- JavaScript
- Privacy Sandbox
February 29, 2024
Privacy Sandbox response to IAB Tech Lab's Fit Gap Analysis for Digital Advertising
We're responding because we believe that it's important to listen to what IAB Tech Lab is presenting and that the ecosystem has the most up to date, accurate information.
- Privacy Sandbox
February 15, 2024
Join the Privacy Sandbox Office Hours: Private State Tokens
Register for the upcoming Private State Tokens Office Hours. Coming on the 27th February in Portuguese and 6th March in English.
- Privacy Sandbox
February 4, 2024
FedCM updates: Disconnect API and two updates
Chrome 122 introduces FedCM Disconnect API and two updates. The Disconnect API allows the browser to terminate the connection between the RP and the IdP.
- Federated Credential Management API
- Web
- JavaScript
- Privacy Sandbox
January 29, 2024
Join Privacy Sandbox Office Hours #12: Learn about Chrome-facilitated testing
Join the 12th edition of Privacy Sandbox office hours dedicated to Chrome-facilitated testing, where we will provide some Privacy Sandbox tester updates and answer your questions with product and technical leads.
- Privacy Sandbox
January 29, 2024
Third-party cookie deprecation trial for top-level sites now available
If your first-party site relies on third-party embedded services and third-party cookie deprecation has caused functionality on your website to break, you may be eligible for the deprecation trial for top-level sites.
- Privacy Sandbox
January 25, 2024
Introducing the Privacy Sandbox Analysis Tool (PSAT)
Announcing the Privacy Sandbox Analysis Tool, a DevTools extension with specialized capabilities to help developers deal with the deprecation of third-party cookies and adoption of alternative APIs.
- Privacy Sandbox
January 15, 2024
Third-party cookies restricted by default for 1% of Chrome users
If your site uses third-party cookies it's time to take action as we approach their deprecation. Third-party cookies are restricted by default for 1% of users from January 4th, 2024 to facilitate testing before we plan to ramp up to 100% of users from Q3 2024.
- Privacy Sandbox
January 4, 2024
Shipping the Privacy Sandbox relevance and measurement APIs
Plans and timeline for gradually enabling the Privacy Sandbox relevance and measurement APIs in Chrome 115, ending the origin trial, and enrollment updates.
- Privacy Sandbox
December 21, 2023
Participate in the origin trial for non-cookie storage access through the Storage Access API
Chrome is proposing the ability for third parties to request storage or communication access (both cookie and non-cookie) through the Storage Access API.
- JavaScript
- Privacy Sandbox
December 4, 2023
Request additional migration time with the third-party cookie deprecation trial
To facilitate testing, Chrome has restricted third-party cookies by default for 1% of Chrome users. Chrome plans to ramp up third-party cookie restrictions to 100% of users from Q3 2024, subject to addressing any remaining competition concerns of the UK's Competition and Markets Authority. For an easier transition through the process, we are offering a third-party deprecation trial which allows embedded sites and services to request additional time to migrate away from third-party cookie dependencies for non-advertising use cases.
- JavaScript
- HTML
- Privacy Sandbox
November 20, 2023
Preparing for the end of third-party cookies
If your site uses third-party cookies, it's time to take action as we approach their deprecation. To facilitate testing, Chrome has restricted third-party cookies for 1% of users from January 4th, 2024. Chrome plans to ramp up third-party cookie restrictions to 100% of users from Q3 2024, subject to addressing any remaining competition concerns of the UK's Competition and Markets Authority. In this Cookie Countdown series, we'll guide you through the timeline and immediate actions you can take to ensure your sites are prepared.
- Privacy Sandbox
October 11, 2023
Related Website Sets - the new name for First-Party Sets in Chrome 117
Related Website Sets (RWS) is the new name for First-Party Sets. It also brings increased flexibility in defining sets.
- Privacy Sandbox
August 31, 2023
FedCM updates: IdP Sign-In Status API, Login Hint, and more
Chrome 116 ships new FedCM capabilities such as Login Hint API, User Info API, and RP Context API, and starts an origin trial for IdP Sign-In Status API.
- Federated Credential Management API
- Web
- JavaScript
- HTML
- Privacy Sandbox
July 21, 2023
Introducing Privacy Sandbox Demos
Privacy Sandbox Demos offer cookbook recipes, sample code, and demo applications, based on Privacy Sandbox APIs.
- Privacy Sandbox
June 29, 2023
Enhancements to the Topics API
Updates to top topics selection, the Topics taxonomy and filtering mechanisms, along with speed improvements and enhanced user controls.
- Privacy Sandbox
June 15, 2023
Storage partitioning deprecation trial extended
Sites that haven't had time to adapt their sites for third-party storage partitioning can take part in a deprecation trial to temporarily unpartition and restore prior behavior of storage, service workers, and communication APIs in content embedded on their site.
- Privacy Sandbox
June 9, 2023
Preparing to ship the Privacy Sandbox relevance and measurement APIs
General availability for these APIs begins in late July with Chrome Stable 115.
- Privacy Sandbox
May 18, 2023
Developer enrollment for the Privacy Sandbox
A new process to new verify developer identity and gather configuration details for the Privacy Sandbox relevance and measurement APIs, across Chrome and Android.
- Privacy Sandbox
April 13, 2023
Participate in deprecation trial for unpartitioned third-party storage, Service Workers, and Communication APIs
Beginning gradually in Chrome 115, storage, service workers, and communication APIs will be partitioned in third-party contexts. For sites that need time to adjust to this new feature, these deprecation trials will allow them to temporarily keep their third-party storage, service workers, and communication APIs unpartitioned.
- Privacy Sandbox
March 9, 2023
Prepare for Chrome's user‑agent reduction
Starting in Chrome 110 (February 2023) we are gradually introducing a fixed value for Android version and device model—the default value will always be `Android 10` on a model `K`.
- JavaScript
- Privacy Sandbox
February 27, 2023
FLEDGE Bidding and Auction services availability
These services will be available for testing in 2023, for Chrome and Android.
- Privacy Sandbox
February 9, 2023
December 13, 2022
Participate in origin trial for Accept-Language Reduction
Accept-Language Reduction is an effort to reduce passive fingerprinting surfaces in the Chrome browser.
- JavaScript
- Privacy Sandbox
December 1, 2022
First-Party Sets testing instructions
First-Party Sets can allow related domain names that are owned and operated by the same entity to be treated as first-party in situations where first party and third party are otherwise treated differently.
- Privacy Sandbox
December 1, 2022
Privacy Sandbox for the web: Expanding testing into 2023
Testing takes time. We're taking a deliberate approach to testing the Privacy Sandbox for the web. The APIs are available for functional testing through origin trials sets the stage for expanded testing in 2023—including live traffic end-to-end experiments—with a focus on understanding ecosystem outcomes and the real-world impact of transitioning away from third-party cookies.
- Privacy Sandbox
November 10, 2022
Increasing the Privacy Sandbox Relevance and Measurement origin trial to 5%
This week, no sooner than October 26, we'll begin increasing the Privacy Sandbox Relevance and Measurement origin trial population towards 5% of Chrome Stable users.
- Privacy Sandbox
October 24, 2022
No spooky cookies
Cookies are best fresh, so what are the latest recipes to ensure you can still enjoy spooky season without any stale cookies?
- Privacy Sandbox
October 24, 2022
Participate in early testing for Storage Partitioning
To improve privacy, Chrome is changing how storage and communication APIs will behave in future releases. Read more about the upcoming change and how to check if your site is affected by Storage Partitioning.
- Privacy Sandbox
September 1, 2022
Prepare for User-Agent Reduction changes in October
In October, Chrome will take the next step in reducing the information available in the browser's User-Agent string, to improve privacy for users. With this change, websites and services that rely on the User-Agent string for certain information may need to take action. This post gives some background on what's happening, why Chrome is making this change, and what you can do to prepare.
- Privacy Sandbox
August 25, 2022
FLEDGE services for Chrome and Android
FLEDGE is a Privacy Sandbox proposal to serve remarketing and custom audience use cases, designed so it cannot be used by third parties to track user browsing behavior across sites.
- Privacy Sandbox
August 24, 2022
August 23, 2022
Expanding Privacy Sandbox testing
As the Privacy Sandbox timeline changes, learn about the expanding and extending the Privacy Sandbox Relevance and Measurement origin trial and how you can test and give feedback to shape the future of the APIs.
- Privacy Sandbox
July 27, 2022
Progress in the Privacy Sandbox (May - June 2022)
Updates including including an expanded Privacy Sandbox Relevance and Measurement trial for Attribution Reporting, FLEDGE, Topics, fenced frames, and Shared Storage. We've published the 2022 Q1 feedback summary report along with hosting more developer Office Hours.
- Privacy Sandbox
July 8, 2022
Attribution Reporting updates in June 2022
Review the latest changes to the Attribution Reporting API.
- Privacy Sandbox
June 23, 2022
Generate summary reports with the aggregation service
Experiment and set up the aggregation service to generate Attribution Reporting summary reports.
- Privacy Sandbox
June 6, 2022
Cookies Having Independent State (CHIPS) origin trial extended
CHIPS is a Privacy Sandbox proposal that introduces a mechanism to opt-in to having third-party cookies partitioned by top-level site. The origin trial that started in Chrome 100, will now be available on Chrome 106+ until October 25, 2022.
- Privacy Sandbox
May 26, 2022
Progress in the Privacy Sandbox (March - April 2022)
Updates including including a number of APIs available for origin trial: CHIPS for partitioned cookies and Attribution Reporting, FLEDGE, and Topics as part of the combined Privacy Sandbox Relevance and Measurement trial.
- Privacy Sandbox
May 17, 2022
Join Privacy Sandbox developer office hours #1: learn about Chrome Origin Trials
Join the Google Chrome team in our Privacy Sandbox office hours, where developers testing and integrating the Privacy Sandbox technologies can ask questions of Chrome tech leads.
- Privacy Sandbox
April 18, 2022
Test the Privacy Sandbox ads relevance and measurement APIs
Learn about developer testing and the upcoming origin trial allowing for unified experimentation across the Privacy Sandbox relevance and measurement APIs: Topics, FLEDGE, and Attribution Reporting.
- JavaScript
- Privacy Sandbox
March 31, 2022
Cookies Having Independent Partitioned State (CHIPS) origin trial
Starting in Chrome 100, CHIPS origin trial allows opting cookies in to "partitioned" storage, with a separate cookie jar per top-level site. Partitioned cookies can be set by a third-party service, but only read within the context of the top-level site where they were initially set.
- JavaScript
- Privacy Sandbox
March 17, 2022
Progress in the Privacy Sandbox (January/February 2022)
Updates including Privacy Sandbox on Android, CHIPS origin trial, user-agent reduction, the new Topics proposal, and major updates for FLEDGE and Attribution Reporting.
- Privacy Sandbox
March 4, 2022
User-Agent Reduction deprecation trial
Starting from Chrome 101, the information available in the User-Agent string will be reduced. Sites that haven't had time to migrate away from using the reduced User-Agent string can take part in a deprecation trial to continue receiving the full User-Agent string.
- Privacy Sandbox
February 24, 2022
FLEDGE API developer guide
Protected Audience API is a Privacy Sandbox proposal to serve remarketing and custom audience use cases, designed so it cannot be used by third parties to track user browsing behavior across sites.
- HTML
- JavaScript
- Privacy Sandbox
January 27, 2022
Attribution Reporting proposal updates in January 2022
Learn about changes made to Attribution Reporting to reflect community feedback.
- Privacy Sandbox
January 27, 2022
Progress in the Privacy Sandbox (December 2021)
Looking back at stats from 2021 and some resolutions for tackling user-agent and cookies in 2022.
- HTML
- Privacy Sandbox
January 7, 2022
Progress in the Privacy Sandbox (November 2021)
Monthly summary of Privacy Sandbox news including a CDS recap and User-Agent testing guidance.
- Privacy Sandbox
November 30, 2021
Progress in the Privacy Sandbox (October 2021)
Monthly summary of Privacy Sandbox news including the renamed Federated Credentials Management API and W3C TPAC sessions.
- Privacy Sandbox
October 29, 2021
Progress in the Privacy Sandbox (September 2021)
Monthly summary of Privacy Sandbox news including Chrome's user-agent reduction and timeline updates.
- Privacy Sandbox
September 30, 2021
User-Agent Reduction origin trial
Starting in Chrome 95 Beta, an origin trial allowed sites to opt into receiving the reduced user agent string, which will contain only the browser's brand and significant version, its desktop or mobile distinction, and the platform it's running on.
- Privacy Sandbox
September 14, 2021
Progress in the Privacy Sandbox (August 2021)
First in the series of monthly summaries for changes across the Privacy Sandbox proposals. Share your feedback on this first edition so we can improve as we go.
- Privacy Sandbox
August 30, 2021
[OUTDATED] First-Party Sets and the SameParty attribute
First-Party Sets can allow related domain names that are owned and operated by the same entity to be treated as first-party in situations where first party and third party are otherwise treated differently.
- Privacy Sandbox
August 26, 2021
How to take part in the FLoC origin trial
Federated Learning of Cohorts (FLoC) provides a privacy preserving mechanism for interest-based ad selection. This article explains how to take part in the FLoC origin trial.
- JavaScript
- Privacy Sandbox
March 30, 2021
Progress update on the Privacy Sandbox initiative
The Privacy Sandbox proposes a set of privacy-preserving APIs to support business models that fund the open web in the absence of tracking mechanisms like third-party cookies. This post provides an update on the status of the APIs and proposals.
- Privacy Sandbox
January 25, 2021
How to participate in the Privacy Sandbox initiative
The Privacy Sandbox proposes a set of privacy-preserving APIs to support business models that fund the open web in the absence of tracking mechanisms like third-party cookies. This post explains how to participate.
- Privacy Sandbox
January 25, 2021