Tag Master
Debug GA4 & GTM like a pro - all tools in one side panel
Tag Master launched on February 25, 2026 with 3 votes, #3,486 of 16,627 launches that month and more than 50% of that year's launches.
What it does
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.
Free Chrome extension that decodes tracking hits from 62 platforms — GA4, GTM, Meta, TikTok and more. Detects server-side GTM and Consent Mode V2 violations.
Tag Master decodes GA4, GTM, Google Ads, Meta, TikTok, Adform, Adobe and 45 more platforms in real time — then tells you what each one got wrong, and switches on that platform’s own test mode when you need it. Every dataLayer push lists the requests it produced, matched by event name across platform spellings. Then it puts what the push carried next to what the tag actually sent. A funnel checklist across the pages actually walked, a client ID that changes mid-journey, domain hops with no linker, and the chain from ad click to conversion. Every hit decoded into readable parameters — account ID, event name, value, currency — not raw query strings. Hits proxied through your own first-party…from tagmaster.dev
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