Abandoned cart recovery: from checkout fixes to recovery emails
Why shoppers leave before paying, and how to win them back: checkout fixes, a recovery email sequence and remarketing.
Remarketing means showing ads to people who have already visited your website, app or social media pages. A pixel or tag adds each visitor to an audience, which you then load into Google Ads or Meta Ads. It works well when you segment visitors, cap frequency and collect the consent you need before any tracking starts.
What remarketing is, and how it differs from retargeting
Most visitors leave a website without buying or asking for a quote. That does not mean they are uninterested. They may be comparing options, short of time or waiting for a decision. Remarketing gives you another chance to reach them, with a message suited to the stage they are at.
In practice, “remarketing” and “retargeting” are used almost interchangeably. Google has traditionally used “remarketing” for ads aimed at site visitors, while “retargeting” became the everyday term elsewhere. What matters to you is the mechanism, not the label.
Key terms
An audience is the list of people (in fact, of browsers or accounts) you can target. A retention window is the number of days someone stays in the audience after their last action. Frequency is how many times the same person sees your ad in a given period. An exclusion removes certain groups from targeting, for example people who have already bought. A pixel or tag is the snippet of code that records actions on your site.
How it works, from click to ad
The mechanism has four stages, whichever platform you use:
- Collection: the Meta pixel or Google tag (installed directly or through Google Tag Manager) records which pages someone views and which actions they take, once they have accepted the relevant cookies.
- Segmentation: you define rules, such as “viewed a product page in the last 30 days” or “added to basket but did not buy”.
- Audience: the platform automatically adds people who meet the rule and removes them when the window expires.
- Delivery: you create a campaign that targets the audience, with ads adapted to it.
Because of browser and operating system restrictions, ad blockers and refused cookies, audiences are usually smaller than your real traffic. That is why correct measurement matters, including, where possible, sending events from the server side as well. For reliable conversion tracking, see our guide to tracking with GA4 and the Meta Pixel.
Types of remarketing and when to use them
| Type | How it works | Best suited to |
|---|---|---|
| Website visitors | Audiences based on pages or events | Almost any business with enough traffic |
| Dynamic remarketing | The ad shows the exact products viewed, taken from the product feed | Online shops with a large catalogue |
| Customer lists | You upload email addresses or phone numbers (hashed) with a legal basis | Reactivating customers, excluding existing ones |
| Social and video engagement | People who watched videos or interacted with your page | Building trust, educational content |
| Search remarketing | You adjust bids or ad text for people who have visited before | Longer purchase cycles, B2B |
Dynamic remarketing needs a well-structured product catalogue; to learn how to build one, read our guide to the Google Shopping product feed.
Audience segments and retention windows
The main mistake is one big group, “all visitors”, with the same message for everyone. Someone who viewed the contact page has a different intent from someone who read a blog post. Segment by behaviour and match the message. The windows below are only indicative; adjust them to the length of your own decision cycle.
| Segment | Indicative window | Suitable message |
|---|---|---|
| Abandoned basket or started form | 1–7 days | Reminder, answers to objections, help to finish |
| Viewed a product or service | 7–30 days | Benefits, reviews, comparisons, guarantees |
| General site visitors | 30–90 days | Useful content, an introduction to the business, proof |
| Existing customers | 90–180 days | Complementary products, renewals, referrals |
On Meta, website-based audiences have generally been limited to 180 days. On Google Ads the maximum duration is longer, and limits can change, so check the figures in the current interface. For a service with a quick decision, such as a salon appointment, 30 days may be a lot. For an expensive product or a B2B purchase, a longer window is natural.
Frequency and exclusions: how not to annoy people
Poorly run remarketing quickly becomes irritating: the same ad ten times a day, week after week. A few simple principles:
- Exclude buyers from persuasion campaigns straight after purchase. Move them into a separate flow for complementary products.
- Control frequency. Track how often someone sees the ad each week and cap it where the platform allows; if the figure climbs without results, change the message or widen the audience.
- Rotate creatives. Three or four different versions wear out an audience more slowly. Testing methods are in our article on testing creatives in Facebook Ads.
- Sequence messages. The first ad presents the benefit, the second social proof, the third an offer or a deadline.
- Stop the campaign when the window expires, instead of showing ads to people who are no longer interested.
Consent and GDPR: what you need in place
Remarketing relies on behavioural data, so it falls under European rules on data protection and electronic communications. In broad terms, you need a cookie banner that obtains consent before advertising pixels load, a privacy policy that describes this processing and a simple way to withdraw consent.
- Remarketing pixels must not load before the visitor accepts the marketing category.
- For customer lists uploaded to platforms you need a valid legal basis and must inform the people concerned; hashing the addresses does not replace the legal basis.
- Sensitive categories (health, sexual orientation, financial situation and so on) are restricted by platform policies and by law; check before any campaign.
- Document your setup, in case individuals or authorities ask for it.
General information, not legal advice. For your specific case, speak to a lawyer or your data protection officer (DPO). Official guidance is available from the EU legislation portal and from your national data protection authority.
Examples by type of business
The examples below are hypothetical. They show the logic, not guaranteed results.
An online footwear shop
Imagine a shop that sells trainers. People who viewed a model in the last 7 days receive dynamic ads showing that product and similar ones. Those who abandoned their basket receive a message about delivery and returns. Buyers are excluded for 14 days, then shown accessories. For basket recovery, combine these ads with emails, as described in our guide to abandoned cart recovery.
A B2B service company
A consultancy has little traffic but a high value per client. Visitors to the service pages see, over a window of 60 to 90 days, useful articles, its own case studies and an invitation to a call. The audience is small, so the budget is modest and frequency stays low.
A local clinic or salon
Visitors to the booking page who did not complete the form receive, for two weeks, a local ad with opening hours and a genuine review. Existing clients are excluded from the acquisition campaign. A clinic must be especially careful: health data is a special category under the GDPR, so never upload patient lists or target people by medical condition.
How to start, in six steps
- Check that the pixel and key events (product view, add to basket, form submission) are recorded correctly.
- Secure consent through a banner and test that the pixels load only after agreement.
- Create three or four basic audiences: abandoned basket, product view, general visitors, customers.
- Prepare a different message and creative for each segment.
- Set a small budget and work out what volume of impressions it buys; the ads budget simulator helps you make an indicative estimate.
- Review results after two to four weeks and adjust windows, frequency and creatives.
If the audiences are too small to run (platforms require a minimum number of people), use a longer window or combine segments instead of forcing budget onto a tiny audience.
How to measure remarketing
Remarketing results often look better than those of other campaigns, because the people who see the ads are already interested, and some of them would have bought anyway. Do not rely only on the ROAS reported by the platform. Compare total sales, new against returning buyers and, where you can, keep a control group that sees no ads to find out how much remarketing adds.
Common mistakes
- A single “all visitors” audience and an identical message for everyone.
- Buyers not excluded, so they see ads for what they have already bought.
- Uncontrolled frequency and repeated ads for weeks.
- Pixels loading without consent.
- Windows too long for products with a quick decision.
- Tracking events set up wrongly, giving empty or incomplete audiences.
- Judging only by platform ROAS, without looking at the whole picture.
How we work
We start by checking tracking and consent, because remarketing has no foundation without them. Then we build a small number of clear audiences, with different messages at each stage and strict exclusions, and keep frequency under control. We report remarketing results separately from new-audience acquisition, so that the two are not confused.
If you would like us to set it up, see our Facebook and Instagram Ads service.
In short
- Remarketing shows ads to people who have already interacted with your business.
- It relies on a pixel or tag, audiences and retention windows.
- Segment by behaviour and match the message to the stage.
- Exclude buyers and control frequency.
- Collect consent before loading advertising pixels.
- Judge it incrementally, not only by the platform’s ROAS.
What is the difference between remarketing and retargeting?
In everyday use they are synonyms: both mean ads aimed at people who have already interacted with you. Some platforms use one term or the other for slightly different features, such as customer lists. What matters is that you understand which audience you are creating and from what data.
How much traffic do I need for remarketing?
Platforms require a minimum audience size before they deliver ads, and the thresholds can change. If traffic is low, use longer windows, broader audiences or customer lists. For sites with very few visitors, it is more useful to build qualified traffic first.
Is remarketing legal without a cookie banner?
Generally not. Advertising pixels need the visitor’s consent before they load, under European rules on electronic communications and data protection. Ask a lawyer or a DPO about the exact setup for your site.
How long should I follow a visitor?
It depends on the decision cycle. For quick purchases, 7 to 30 days is often enough; for expensive products or B2B decisions you can go to 60 to 180 days. Begin with shorter windows for high intent and longer ones for content viewers, then adjust to results.
How do I avoid bothering customers with too many ads?
Exclude recent buyers, cap frequency, rotate several creatives and close audiences once the window expires. Watch comments and negative reactions: if people say the ad is following them everywhere, frequency is too high.
Is remarketing worthwhile on a small budget?
Often yes, because audiences are small and the total cost stays manageable. Start with a high-intent segment, such as abandoned baskets or the contact page, and a modest budget. If you do not have enough visitors, concentrate first on bringing in relevant traffic.