Google Tag Manager News & Updates for August 2025

Google Tag Manager launches readAnalyticsStorage API to read GA client and session cookies

8 days ago

The readAnalyticsStorage sandbox API lets developers safely read Google Analytics client and session IDs in custom templates, replacing unreliable reverse-engineering methods. This prevents issues from cookie format changes. It is part of Google Tag Manager's custom template APIs, which use sandboxed JavaScript with require() statements. Another API, addConsentListener, registers functions to track consent state changes.

New Web Analytics Community Launches to Support Marketers and Data Professionals

21 days ago

Google Analytics Tracking +1 more

Web Analytics Community offers step-by-step courses on GA4, GTM, attribution, and more, plus templates, audit checklists, dashboards, bi-weekly live Q&A, and a supportive forum. It's designed for marketers, freelancers, founders, and analysts to improve tracking, reporting, and data skills without technical overwhelm. Founding members get early access, perks, and influence on future content.

Google Tag Manager adds control to manage monitored domains in Container Diagnostics tool

1 months ago

Google Tag Manager

Google Tag Manager now lets users choose which domains to monitor with the Container Diagnostics tool and ignore others. Domains inactive for over 60 days are automatically deleted. This update offers more control to reduce noise and false positives from the tool.

Google Unveils New AI Tools for Measurement and First-Party Data Strategies

2 months ago

Google Ads Tracking +1 more

Google introduced AI-driven tools to improve advertisers' measurement and first-party data strategies. Incrementality testing now has lower spend thresholds and better methods to identify value. Cross-channel measurement in Google Analytics will provide deeper customer journey insights. Data Manager consolidates data with privacy protections and a new API to boost ROI. These tools help marketers prove ad ROI, manage data, and understand consumer journeys.

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First-party Mode with Cloudflare rebranded as Google Tag Gateway

3 months ago

Tracking Google Tag Manager

Cloudflare and Google have introduced first-party domain mapping for Google Tag, part of all Cloudflare plans. This feature allows users to mask Google Tag URLs with a first-party domain, redirecting them to Google in the backend. While it improves performance, more complex setups are needed for additional destinations. Any domain proxied through Cloudflare can serve Google tags, enhancing measurement signals and campaign performance, with early testers seeing an uplift.

Google Tag Manager Adds New Diagnostic Alerts and Dismissal Options for Users

3 months ago

Google Tag Manager

Google has introduced new diagnostic alerts in the Tag Diagnostics tool to help users address implementation issues. The alerts include notifications for restricted tag data, missing gtag config commands, and missing Google tags. Users can enable first-party mode, adjust configurations, or add missing tags to resolve these issues. Additionally, some alerts can be dismissed, but critical issues will remain visible. These features improve tag implementation and data collection.

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Google Tag Manager Containers to Automatically Load Google Tag Starting April 2025

5 months ago

Google Ads Google Tag Manager

Google is updating Google Tag Manager (GTM) containers to enhance tracking with Google Ads starting April 10, 2025. Containers will load a Google tag before sending events, improving tracking reliability and increasing measurement data volume. Benefits include easier access to features like enhanced conversions and smoother data collection for users who accept Google's data terms. Google recommends adding the Google tag to preview impacts.

Google Tag Now Uses Service Workers to Enhance GTM Server-Side Data Transmission

5 months ago

Google Tag Manager

Google has updated Google Tag to use service workers for server-side Google Tag Manager data transmission, enhancing measurement performance and reliability. This change improves upon the navigator.sendBeacon() method by enabling offline data storage, deferred transmission, and better reliability during poor network conditions. Website owners may need to adjust their Content Security Policy to accommodate this functionality.

Hackers Exploit Google Tag Manager to Steal Credit Card Information

5 months ago

Google Tag Manager

Hackers are exploiting a vulnerability in Magento eCommerce sites to inject malware via Google Tag Manager, which steals credit card information during checkout. The malware includes a hidden PHP backdoor to maintain access and capture user data. Sucuri researchers found the malicious script disguised as normal. They identified at least six infected sites and recommend removing suspicious GTM tags, scanning for malware, and ensuring software is updated.

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