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Track PDF Engagement with PDF.js (Page Views, Scroll Depth, Downloads, Print). GA4 / GTM ready
Backstory (why this post exists at all) This article basically wrote itself because I ran into a simple question: how to track what users actually do inside a PDF on website? Companies love PDFs. Whitepapers, manuals, reports, price lists, templates… you name it. And as a site owner you usually know only one thing: how
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Google quietly changed the GA4 cookie format (GS2)
Yesterday your tracking was “fine”. Today: That’s usually the worst kind of bug: everything fires, but everything lies. What happened: GA4 started rolling out a new format for its session-state cookie around May 6, 2025. The community calls it GS2. Quick clarification: which GA4 cookies are we talking about? GA4 web tagging typically sets (at