What is scroll depth?
Scroll depth is a measure of how far down a web page visitors scroll, usually reported as a percentage of the page, such as 25%, 50%, or 90%. It shows how much of your content people actually see.
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What scroll depth tells you
If most visitors stop well before your call to action, they never see it. Scroll depth helps you decide where to place key content and whether a page is too long.
How it's tracked
Scroll depth is usually recorded as events when a visitor passes set points on the page. Heatmap tools also show it as a scroll map, with color marking how many people reached each part.
When enhanced measurement is enabled, Google Analytics 4 fires a scroll event the first time 90% of a page's vertical depth becomes visible. Tracking other thresholds takes extra setup.
Reading it with care
Scrolling isn't the same as reading. A visitor may scroll quickly past content, and short pages may show a high depth with little engagement. Combine it with time on page, clicks, and conversion data.
Common questions
What is a good scroll depth?
It depends on page length and purpose. A short landing page might see most visitors reach the bottom, while a long article won't. Compare similar pages.
How do you track scroll depth?
Use a tag manager to fire events at set percentages, or use a heatmap tool that reports scroll maps. GA4 enhanced measurement records the first time 90% of each page becomes visible when scroll tracking is enabled.
Does scroll depth affect SEO?
It isn't a known ranking factor. But it can show whether your content holds attention, which helps you improve pages for visitors.
How does scroll depth differ from page length?
Page length is how long the page is. Scroll depth is how far visitors actually go down it, which can be far less than the full page.
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