You should install the remarketing tag on all pages of your website and here’s why:
Why All Pages?
Broader Audience Capture
You can segment visitors based on their behavior: homepage viewers, blog readers, product viewers, cart abandoners, etc.
Smarter List Building
More page data means you can create layered remarketing audiences like:
Dynamic Remarketing Requires It
If you're using dynamic remarketing, the tag needs to fire on every page to pass data like page type, product ID, and value.
Future-Proofing
Even if you don't use all the data now, having the tag on all pages ensures you don’t miss potential future targeting opportunities.
When to Tag Only Key Pages?
Only if:
You have strict compliance limits (e.g., GDPR restrictions).
You want extremely narrow segments (e.g., checkout abandoners only).
You're testing before full deployment
Best Practice:
Place the tag across all pages using Google Tag Manager with a trigger like All Pages then use rules and segments in Google Ads to narrow your targeting later.