How retargeting works, and when it wastes money

The basic idea

Retargeting (or remarketing) shows ads to people who have already interacted with you: visited your site, watched a video, engaged on Instagram, added to cart or started a form. Platforms build these audiences from your pixel, server-side events, engagement data and, with consent, customer lists.

Audiences worth retargeting

• Cart or form abandoners: highest intent, smallest audience.
• Product or service page viewers: interested, not yet committed.
• Video viewers and engagers: warm but early.
• Past customers: for repeat purchase, upgrades or referrals.

Creative for each stage

• Abandoners: objection busters (delivery, returns, price, payment options), reminders and reassurance.
• Viewers: proof: testimonial-style UGC, demos, comparisons.
• Engagers: the next step of the story, not the same ad again.
• Customers: complementary products, refills and loyalty offers.

When retargeting wastes money

• It takes credit for inevitable sales. People who were going to buy anyway click a retargeting ad, and the platform claims the sale.
• Budgets are out of proportion. If most spend goes to retargeting, you're fishing in a shrinking pond. Prospecting has to keep filling it.
• Frequency is too high. Seeing the same ad many times annoys people.
• Privacy limits shrink audiences. Cookie consent and device privacy mean retargeting pools are smaller and less precise than they used to be.

A sensible approach

Keep retargeting a modest share of spend, use different creative from prospecting, cap frequency, and judge success with blended metrics such as MER and new-customer CAC rather than retargeting ROAS alone. See what ROAS can't tell you.

Retargeting is planned as part of every performance marketing engagement.

A quick audit of your retargeting

• What share of total spend goes to retargeting?
• How large is each retargeting audience, and how often is it refreshed by prospecting?
• What frequency are people seeing?
• Is retargeting creative different from prospecting creative?
• If you paused retargeting for a week in one region, would sales actually drop?