Masoud Azizi
Co-Founder and CMO of Indigo Mars
Retargeting ads convert at roughly three to five times the rate of ads shown to people who've never encountered your business before, and typically cost 40 to 60% less per conversion. The mechanism is simple: a small tracking snippet on your website — Google calls it a remarketing tag, Meta calls it a pixel — notices when someone visits, and shows your ads to that same person on other sites afterward. You're not chasing strangers; you're staying visible to people who already showed real interest.
How It Actually Works
When someone visits your website, the tracking code installed in your site's header adds them to an audience list. Later, when that same person visits another site running Google Display ads, or scrolls Instagram or Facebook, the ad platform recognizes them and shows your ad instead of a stranger's. Google requires a minimum audience size before retargeting campaigns can run — generally around 100 recent visitors for Display Network retargeting, more for Search-based retargeting — which means a brand-new, low-traffic site needs to build up visits through other channels first before retargeting becomes a realistic option.
Why It Converts So Much Better
Very few people make a real purchasing decision on their first visit to a business's website. Someone gets distracted, gets pulled away, or simply isn't ready yet — not because they weren't interested, but because life interrupted the moment. Retargeting isn't about convincing a stranger; it's about staying visible to someone who already cleared the hardest part of marketing — getting genuine attention — while they finish making up their mind. That's the entire reason the conversion math looks so different from cold advertising.
How Long to Keep Someone in Your Retargeting Window
The right window depends on what you're selling. For an impulse decision or a lower-cost service, seven to fourteen days is usually enough — interest that hasn't converted by then has likely cooled meaningfully. For a more considered purchase — a home renovation, a significant service commitment — thirty to sixty days better matches how long people actually take to decide. High-ticket purchases or B2B decisions can reasonably extend to ninety days or more. Thirty days is a reasonable default to start with if you're unsure, adjusted from there based on what your own data shows.
Don't Overdo It: Frequency and Ad Fatigue
Showing the same person your ad too often backfires — five to seven impressions a week is a reasonable ceiling before diminishing returns turn into active annoyance and a negative impression of the business. If you notice click-through and conversion rates dropping meaningfully after the first couple of weeks of a campaign, that's usually a frequency problem, not a targeting problem — lowering how often the same person sees the ad, and rotating creative regularly, both help.
One Real Limitation Worth Knowing
Apple's privacy changes in recent years have measurably shrunk the addressable audience available for retargeting, since a meaningful share of iOS users now opt out of the tracking that makes this work. This doesn't make retargeting not worth doing — it remains one of the strongest-converting formats available — but it does mean the audience sizes and reach that worked a few years ago are somewhat smaller today, worth factoring into expectations rather than being surprised by later.
Where to Go From Here
Retargeting works best as a complement to a working campaign already generating traffic — see Google Ads for Local Businesses: A Beginner's Guide or Meta Ads vs. Google Ads: Which Should You Start With?
Not sure whether your traffic is ready for a retargeting campaign yet? Get in touch — we'll give you a straight read on whether now's the right time.
