Part 1Feb 22, 2026
What Is GCLID? Google Click Identifier Explained (2026 Guide)
Learn what GCLID is, how Google's click identifier works, why it matters for conversion tracking, and how to troubleshoot common GCLID issues.
Read article →A focused collection of articles covering gtm advanced — from fundamentals to advanced scenarios.
← Back to all postsLearn what GCLID is, how Google's click identifier works, why it matters for conversion tracking, and how to troubleshoot common GCLID issues.
Read article →Learn how to track mailto link clicks as conversions in Google Tag Manager. Step-by-step guide covering trigger setup, event tracking, and Google Ads conversion configuration.
Read article →Learn how to track WhatsApp link clicks and button clicks as conversions in Google Tag Manager. Complete guide covering wa.me links, floating widgets, and conversion setup.
Read article →Redirects are one of the most common and least obvious causes of GCLID loss. Learn why redirects strip the Google Click ID, which scenarios cause it, and how to recover attribution.
Read article →If your GA4 purchase event is firing twice, here are the three most common causes - and exactly how to diagnose and fix each one.
Read article →React, Vue, Angular, and Next.js don't reload the page on navigation - so your standard GTM pageview tag only fires once. Here's how to fix it properly.
Read article →If your WhatConverts tracking numbers keep getting disapproved in Google Ads call assets, the root cause is domain verification — not the number itself. Here is exactly why it happens and how to fix it permanently.
Read article →GTM silently fails to load on security-hardened sites because of Content Security Policy. No errors in GA4, no warnings - just missing data. Here's how to diagnose and fix it.
Read article →Shopify won't let you upload files to your domain root — but there's a reliable workaround using Content → Files and a URL redirect. No theme code, no developer needed.
Read article →GA4 treats users as new sessions when they pass through iframes or third-party checkout domains. Here's why it breaks and how to fix it for Calendly, SimplyBook, Typeform, and custom setups.
Read article →When a user navigates to a new page, the GTM data layer resets. Variables like user_type, cart_value, and logged_in status disappear. Here's how to persist them correctly.
Read article →GTM4WP by Thomas Geiger is the cleanest way to push a GA4-compliant ecommerce data layer from WooCommerce into GTM without touching theme code. Here is the full setup for Google Ads conversion tracking.
Read article →Bot traffic and spam sessions from China can skew your analytics, waste ad spend, and inflate conversion data. Here is how to filter it out at the GTM level using a geolocation variable and trigger conditions — no server access required.
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