Tag Master is a free Chrome extension that brings all your GA4 and GTM debugging tools into one side panel.
- Inject GTM snippets on any page and auto-detect containers
- Monitor dataLayer events with GA4 schema validation (scored 0-100)
- Decode GA4, Google Ads & Floodlight network requests with consent state
- Generate CSS selectors and GTM variable code visually
- Manage Google tracking cookies and simulate GCLID for Ads testing
No account needed. No data collection. 100% free.
