What are intrusive interstitials?

Intrusive interstitials, explained

Google describes intrusive interstitials as page elements that obstruct users' view of the content, usually for promotional purposes. Its guidance lists two things not to do: don't obscure the entire page with interstitials, and don't redirect the user to a separate page for their consent or input. Newsletter popups that cover the article on load, app install screens and full-page ads are the usual examples.

Some interstitials are fine or legally required. Google names consent dialogs, age verification for age-restricted content and login pages for paywalled content. For these, it recommends overlaying the dialog on top of the content, so the content is still in the page, and making sure Googlebot can reach the content without getting stuck behind a mandatory gate.

The alternative for promotions is a banner that takes up a small fraction of the screen, like a slim top bar or an inline call to action in the content. Google also suggests using well-supported libraries for consent dialogs rather than custom scripts.

Interstitials are one piece of page experience, which Google says is not a single signal. A popup won't sink an otherwise great page on its own. But it hurts users, often shifts the layout, and on mobile it can hide the very content Google is judging you by. Check pages on a phone with a fresh session to see what new visitors actually get.

Why it matters for founders

Growth playbooks push exit-intent and entry popups. On mobile, where Google indexes, a full-screen popup on first load can undo the work your content does.

Example

Your blog shows a full-screen newsletter modal after two seconds on mobile. You replace it with an inline signup box after the third paragraph and a small sticky bar.

Common mistakes

• Full-screen popups on first load on mobile.
• Redirecting visitors to a separate page for consent.
• Cookie banners that cause layout shift instead of overlaying.
• Gates that block Googlebot from the content.