It's a figure that surprises people the first time they see it: fewer than 3% of people who visit a website buy on that first visit. The rest leave, and without any way to show up in front of them again, the interest they showed is lost for good. That's where remarketing comes in: the technique of showing yourself again to people who already visited your site, while they browse other sites or social media.
How it works, without the jargon
A small piece of code installed on your site (a pixel) anonymously tracks your visitors. From there, Google Ads or Meta Ads let you show them specific ads while they browse elsewhere.
Why it works so well
Unlike advertising to a cold audience that doesn't know you at all, remarketing talks to people who already showed real interest. That usually translates into a much lower cost per conversion than pure acquisition.
The types that work best
- Abandoned cart: showing exactly the product they left behind, sometimes with a small incentive.
- Visitors to a product page who didn't reach the cart.
- Past customers, for cross-selling complementary products.
- A form started but not submitted, very useful for quote requests or bookings.
The mistake that ruins it all
Showing the same ad too many times to the same person creates rejection, the well-known "ad fatigue." Capping frequency and refreshing creatives now and then keeps something this effective from becoming annoying.
With the pixel properly installed and audience lists well defined, remarketing tends to be one of the best-returning ad investments there is, and plenty of businesses haven't even switched it on.
What about privacy? Is this even legal?
Yes, as long as you inform visitors properly and get consent through the cookie banner, as GDPR requires. Remarketing doesn't identify people by name: it works with anonymous browser identifiers, and any user can opt out or clear it at any time.
Frequently asked questions
How long should a remarketing list last?
It depends on the buying cycle: for quick-purchase products, 7-14 days is usually enough; for longer-decision products (a home renovation, an expensive course), 30-90 day lists better capture people still deciding.
Does remarketing work without already having traffic to the site?
No: it needs prior visits in order to show ads afterwards. That's why it's usually combined with acquisition campaigns (SEO, Google search ads, social) that generate that first contact.
How many different ads do I need so it doesn't feel repetitive?
At least 3-4 creative variations rotating, refreshed every few weeks. Repeating the exact same ad for months is the most common cause of ad fatigue.