Remarketing and Retargeting: Getting Visitors Back to Your Site

Here is a sobering statistic: roughly 97% of people who visit your website for the first time leave without taking any meaningful action¹. They do not buy, they do not fill out a contact form, and they do not sign up for your newsletter. They browse, they leave, and - without intervention - they forget you. Remarketing is the intervention. It is the strategy that lets you follow those visitors across the web and bring them back when they are ready to convert.

For Australian businesses investing in driving traffic through SEO, Google Ads, or social media, remarketing is what turns that investment from a single shot at conversion into an ongoing conversation. It is not an exaggeration to say that remarketing can double or triple the return on your existing marketing spend - without increasing your traffic acquisition budget at all.

This guide covers everything you need to know about remarketing and retargeting: how they work, how to set them up across major platforms, how to do them well, and how to stay compliant with Australian privacy law.

Remarketing vs. Retargeting: Definitions and Distinctions

The terms "remarketing" and "retargeting" are often used interchangeably, and in practice, the distinction has blurred considerably. However, there is a traditional difference worth understanding:

Retargeting typically refers to the practice of serving online ads (display, social, or video) to users who have previously visited your website. The mechanism is usually a tracking pixel or cookie that identifies the user as they browse other sites, allowing you to show them relevant ads. This is what most people picture when they think of "those ads that follow me around the internet."

Remarketing originally referred specifically to re-engaging existing contacts through email - for example, sending an abandoned cart email to a customer who left items in their online shopping cart. Google somewhat muddied the waters by branding their retargeting product as "Remarketing" within Google Ads².

In modern practice, "remarketing" has become the umbrella term for any strategy that re-engages people who have previously interacted with your business - whether through display ads, social media ads, email, or other channels. For the purposes of this guide, we will use "remarketing" as the general term.

How Remarketing Works: The Technical Foundation

Remarketing relies on tracking technology to identify and follow users across the web. Understanding the mechanics helps you implement it correctly and troubleshoot when things go wrong.

Pixel-Based Remarketing

The most common remarketing method uses a small piece of JavaScript code (a "pixel" or "tag") placed on your website. When a visitor lands on your site, the pixel drops a browser cookie that anonymously identifies them. As that visitor subsequently browses other websites that participate in the same advertising network (such as the Google Display Network or Meta's Audience Network), the advertising platform recognises the cookie and serves your ads to that specific user³.

The process works like this:

A visitor arrives at your website.
The remarketing pixel fires and places a cookie in the visitor's browser.
The visitor leaves your site without converting.
The visitor later visits another website that is part of the advertising network (a news site, a blog, a social media platform).
The advertising platform recognises the cookie and serves your ad in the available ad space.
The visitor sees your ad, clicks through, returns to your site, and (ideally) converts.

List-Based Remarketing

List-based remarketing uses contact information you have already collected (typically email addresses) to target specific individuals across advertising platforms. You upload your email list to a platform like Google Ads or Meta, which matches those emails against its user database to create a targetable audience. This approach is particularly powerful for re-engaging existing customers with upsell offers, loyalty promotions, or win-back campaigns.

List-based remarketing requires that you collected those email addresses with appropriate consent under the Australian Privacy Act - more on this later.

Server-Side Tracking

With the decline of third-party cookies (more on this below), server-side tracking is becoming increasingly important. Instead of relying solely on browser-based cookies, server-side tracking sends conversion data directly from your web server to the advertising platform. Google's Enhanced Conversions and Meta's Conversions API are examples of this approach. They provide more reliable tracking and better data quality, particularly for users who block third-party cookies or use privacy-focused browsers⁴.

Google Ads Remarketing: Setup and Strategy

Google Ads offers the most comprehensive remarketing capabilities, with access to the Google Display Network (reaching over 90% of internet users worldwide), YouTube, Gmail, and Google Search.

Setting Up Google Ads Remarketing

To get started with Google Ads remarketing:

Install the Google Ads tag: Place the global site tag (gtag.js) on every page of your website, or use Google Tag Manager for easier management. The tag automatically builds your remarketing audience as visitors browse your site.
Create remarketing audiences: In Google Ads, navigate to Tools > Audience Manager > Audience Lists. Create audiences based on specific criteria:
- All website visitors (your broadest audience)
- Visitors to specific pages (e.g., product pages, pricing page, service pages)
- Visitors who started but did not complete a conversion (e.g., began checkout but did not purchase)
- Past converters (for upsell and cross-sell campaigns)
Set membership duration: How long a visitor stays in your remarketing audience. Google allows up to 540 days, but 30-90 days is typical for most businesses. Longer durations make sense for high-consideration purchases (cars, houses, enterprise software) while shorter durations suit impulse or routine purchases.
Create your remarketing campaign: Build a Display campaign, select your remarketing audience, create compelling ads, set your budget and bids, and launch.

Types of Google Ads Remarketing

Standard remarketing: Shows display ads to past visitors as they browse websites and apps on the Google Display Network. This is the most common form and works well for brand awareness and general recall.

Dynamic remarketing: Takes standard remarketing a step further by showing ads that feature the specific products or services the visitor viewed on your site. If someone looked at a pair of shoes on your e-commerce store, dynamic remarketing shows them an ad featuring those exact shoes (and possibly similar products). Dynamic remarketing can increase conversion rates by up to 450% compared to standard display campaigns⁵.

Remarketing Lists for Search Ads (RLSA): This powerful feature lets you adjust your search campaign bids and ad copy for people who have previously visited your site. When a past visitor searches for related keywords on Google, you can bid more aggressively to ensure your ad appears prominently, or show a different ad message that acknowledges their previous visit⁶. RLSA campaigns typically see significantly higher click-through rates and conversion rates than standard search campaigns.

Video remarketing: Target people who have interacted with your YouTube channel or videos with ads across YouTube and the Display Network. This is particularly effective for businesses that use video content in their marketing funnel.

Meta (Facebook and Instagram) Remarketing

Meta's remarketing capabilities are built around its tracking pixel (the Meta Pixel, formerly the Facebook Pixel) and its vast user base. With over 17 million active Facebook users and 13 million active Instagram users in Australia⁷, Meta's platforms offer enormous remarketing reach.

Setting Up Meta Remarketing

Install the Meta Pixel: Add the Meta Pixel code to your website. Like Google's tag, this tracks visitor behaviour and builds audiences. For enhanced tracking, also implement the Conversions API for server-side data transmission⁸.
Create Custom Audiences: In Meta Ads Manager, create Custom Audiences based on:
- Website visitors (all visitors or specific page visitors)
- Customer lists (uploaded email addresses or phone numbers)
- App activity (for businesses with mobile apps)
- Engagement (people who have interacted with your Facebook page, Instagram profile, or previous ads)
- Video views (people who watched a percentage of your video content)
Build Lookalike Audiences: Once you have a solid remarketing audience, create Lookalike Audiences to find new users who share similar characteristics with your existing visitors or customers. This extends the value of your remarketing data beyond re-engagement into prospecting.

Meta Remarketing Best Practices

Meta's visual-first platforms demand high-quality creative assets. Use eye-catching images or videos, write concise ad copy that acknowledges the user's previous interaction ("Still thinking about it?" or "The item you viewed is selling fast"), and always include a clear call to action. Carousel ads work particularly well for dynamic remarketing, allowing you to showcase multiple products the user browsed.

Frequency Capping: Avoiding Ad Fatigue

One of the fastest ways to turn remarketing from a conversion tool into a brand liability is by overexposing your audience. When the same ad follows someone relentlessly across every website they visit, it shifts from a helpful reminder to an irritating intrusion. This phenomenon is known as ad fatigue, and it results in declining click-through rates, negative brand perception, and wasted budget.

Frequency capping limits how many times an individual sees your remarketing ads within a given period. Best practices for frequency capping include:

Display campaigns: Cap at 3-5 impressions per user per day, or 15-20 per week. If someone has seen your ad 20 times and not clicked, showing it 50 more times is unlikely to change their mind.
Social media campaigns: Meta does not offer traditional frequency capping for all campaign types, but you can control frequency through budget management and audience size. Monitor your frequency metric in Ads Manager and pause or refresh creative when frequency exceeds 3-4 per week.
Rotate creative: Even with frequency caps, seeing the exact same ad repeatedly causes fatigue. Prepare multiple ad variations and rotate them to keep the experience fresh.
Exclude converters: Once someone has completed your desired action (made a purchase, filled out a form, booked a call), immediately remove them from your remarketing audience. Continuing to serve "come back and buy" ads to someone who already bought is wasteful and annoying.

Audience Segmentation for Remarketing

Not all website visitors are equal, and your remarketing strategy should reflect that. Sophisticated audience segmentation allows you to deliver the right message to the right person at the right stage of their journey.

By Funnel Stage

Top of funnel (blog readers, homepage visitors): These visitors are early in their research. Remarket with educational content, brand awareness ads, and thought leadership.
Middle of funnel (service page visitors, product browsers): These visitors are actively evaluating options. Remarket with social proof (reviews, case studies), comparison content, and specific value propositions.
Bottom of funnel (cart abandoners, pricing page visitors, contact form starters): These visitors are close to converting. Remarket with urgency, limited-time offers, and direct calls to action. This is your highest-value remarketing audience.

By Recency

A visitor who was on your site yesterday is far more likely to convert than one who visited three months ago. Create tiered audiences based on recency:

1-7 days: Highest intent. Bid most aggressively and use direct conversion messaging.
8-30 days: Moderate intent. Use value-reinforcing messaging and softer calls to action.
31-90 days: Lower intent. Focus on brand recall and new information (updated products, new testimonials, seasonal offers).

By Behaviour

Segment based on specific actions taken on your site:

Visitors who viewed a specific product or service page
Visitors who spent more than a certain amount of time on site
Visitors who viewed multiple pages (indicating deeper engagement)
Visitors who added items to cart but did not complete checkout
Past customers (for upsell, cross-sell, and repeat purchase campaigns)

Dynamic Remarketing: Personalisation at Scale

Dynamic remarketing automatically generates personalised ads based on the specific products or services a visitor viewed on your website. Instead of showing a generic "Visit our store" ad, dynamic remarketing shows the exact blue dress the visitor looked at, the precise hotel room they priced, or the specific consulting package they explored.

Setting up dynamic remarketing requires:

A product or service feed: A structured data file (typically a spreadsheet or XML feed) containing your products or services with images, prices, descriptions, and URLs. Google Merchant Center handles this for e-commerce; for service businesses, you can create a custom feed in Google Ads.
Enhanced tracking: Your remarketing tag needs to capture specific product or service IDs when visitors view individual items, so the platform knows which products to feature in the ad.
Responsive ad templates: Google and Meta both offer automated ad creation that pulls from your feed to build ads in multiple sizes and formats.

Dynamic remarketing is particularly powerful for e-commerce businesses, travel companies, real estate agencies, and any business with a large catalogue of distinct products or services. The personalisation creates a level of relevance that generic display ads simply cannot match.

Privacy Considerations: The Australian Privacy Act

Remarketing inherently involves tracking user behaviour, which brings it squarely into the territory of privacy regulation. Australian businesses must be aware of their obligations under the Privacy Act 1988 (Cth) and the Australian Privacy Principles (APPs)⁹.

Key Privacy Obligations

Transparency: Your privacy policy must disclose that you use remarketing technologies, what data is collected, and how it is used. Vague statements are insufficient - be specific about the platforms you use (Google Ads, Meta, etc.) and the types of tracking involved.
Cookie consent: While Australia does not currently have a cookie consent law as strict as the EU's GDPR, the Privacy Act requires that you inform users about your data collection practices. Best practice - and future-proofing against likely regulatory changes - is to implement a cookie consent banner that allows users to opt out of non-essential tracking, including remarketing pixels.
Data handling: If you upload customer lists for list-based remarketing, you must ensure the data is handled securely and in accordance with the APPs. Both Google and Meta hash email addresses before matching (they do not receive plain-text emails), but you should still document and control how customer data flows between your systems and advertising platforms.
Right to opt out: Users must be able to opt out of personalised advertising. Both Google and Meta provide user-facing ad preference settings, but you should also offer opt-out mechanisms on your own website.

The Third-Party Cookie Phase-Out

Google Chrome's planned deprecation of third-party cookies has been a major talking point in digital marketing. While the timeline has shifted multiple times, the trajectory is clear: traditional cookie-based tracking is becoming less reliable. Safari and Firefox have already blocked third-party cookies by default¹⁰.

To future-proof your remarketing strategy:

Implement server-side tracking (Google Enhanced Conversions, Meta Conversions API)
Build and leverage first-party data (email lists, CRM data, logged-in user data)
Explore Google's Privacy Sandbox solutions, including the Topics API and Protected Audiences API
Invest in contextual targeting as a complement to behavioural remarketing

Measuring Remarketing ROI

Demonstrating the return on your remarketing investment requires careful measurement. Here are the key metrics and approaches.

Key Metrics

View-through conversions: Users who saw your remarketing ad but did not click it, then later visited your site and converted. This metric captures the brand recall effect of remarketing that click-based metrics miss.
Click-through conversions: Users who clicked your remarketing ad and subsequently converted. This is the more traditional conversion metric.
Cost per acquisition (CPA): Your remarketing spend divided by the number of conversions. Remarketing CPA should be significantly lower than your prospecting CPA, because you are targeting warmer audiences.
Return on ad spend (ROAS): Revenue generated divided by remarketing spend. Well-executed remarketing campaigns typically achieve ROAS of 300-800%, though this varies significantly by industry and average order value¹¹.
Conversion rate by audience: Compare conversion rates across your remarketing segments (cart abandoners vs. homepage visitors vs. past customers) to understand which audiences generate the best returns.

Attribution Challenges

Remarketing measurement is complicated by attribution. If a user visits your site via organic search, sees a remarketing ad three days later, and then converts by typing your URL directly into their browser, which channel gets the credit? The answer depends on your attribution model.

Google Analytics 4 uses data-driven attribution by default, which distributes credit across multiple touchpoints based on their statistical contribution to conversions. This provides a more accurate picture of remarketing's role than last-click attribution, which would attribute the conversion entirely to the direct visit and give remarketing no credit at all.

We recommend reviewing conversion paths in GA4 (under Advertising > Attribution > Conversion Paths) to understand how remarketing fits into your customers' typical journey. This analysis often reveals that remarketing plays a crucial assisting role even when it is not the final click before conversion.

Remarketing Campaign Optimisation

Once your remarketing campaigns are live, ongoing optimisation ensures they continue to perform. Here is a practical optimisation checklist:

Refresh creative every 2-4 weeks. Ad fatigue is the enemy of remarketing effectiveness. Regularly introduce new images, copy, and offers to keep your ads feeling fresh.
Test different ad formats. Try static images, animated HTML5 ads, responsive display ads, and video. Different formats perform differently across audiences and placements.
Optimise landing pages. Your remarketing ads should link to specific, relevant landing pages - not your homepage. If someone abandoned a cart, take them back to their cart. If someone viewed a service page, take them back to that service page (or a variant with an additional incentive).
Adjust bids by audience value. Bid more aggressively for high-intent audiences (cart abandoners, pricing page visitors) and less aggressively for low-intent audiences (blog readers, one-page visitors).
Use burn pixels. A burn pixel fires when a user converts, automatically removing them from your remarketing audience. This prevents wasted spend on users who have already taken the desired action.
Monitor placement reports. In Google Ads, check where your display remarketing ads are appearing. Exclude low-quality placements (mobile game apps, parked domains) that generate impressions but not conversions.
Align messaging across channels. If a user sees your remarketing ad on Google Display and then sees a different message on Facebook, the inconsistency undermines your campaign. Coordinate messaging and offers across all remarketing channels.

When Remarketing Is Not Appropriate

While remarketing is powerful, it is not suitable for every situation. Exercise caution or avoid remarketing in these scenarios:

Sensitive industries: Health services, addiction treatment, legal representation, and financial distress services require extra sensitivity. Showing remarketing ads for "bankruptcy lawyers" or "rehab centres" can be intrusive and may violate platform policies. Both Google and Meta restrict remarketing for sensitive categories¹².
Very small audiences: Remarketing requires a minimum audience size to function (1,000 users for Google Display, 100 for Meta). If your website traffic is too low to build meaningful audiences, focus on growing traffic first.
One-time purchases: If your product or service is a genuine one-time purchase (wedding photography, for example), remarketing past customers is wasteful. Focus your remarketing on non-converters and use past customer data for Lookalike audiences instead.

Getting Started: A Practical Action Plan

If you are new to remarketing, here is a straightforward plan to get your first campaigns running:

Week 1: Install the Google Ads tag and Meta Pixel on your website (use Google Tag Manager for easier management). Verify that both pixels are firing correctly using Google Tag Assistant and the Meta Pixel Helper Chrome extensions. Update your privacy policy to disclose remarketing tracking.

Week 2: Allow your pixels to build initial audiences while you create your ad assets. Design at least three variations of display ads in multiple sizes. Write compelling ad copy for each funnel stage. Set up your audience segments in both platforms.

Week 3: Launch your first remarketing campaign. Start with a simple "all website visitors" audience on Google Display, with a modest daily budget. Simultaneously, create a Meta remarketing campaign targeting website visitors with a separate creative approach.

Week 4: Review initial performance data. Check impressions, clicks, click-through rates, and any early conversions. Refine your audience segments, adjust frequency caps, and begin testing additional creative variations.

Remarketing is one of the most efficient and effective strategies in digital marketing. It transforms your existing traffic investment from a one-shot opportunity into an ongoing conversation with potential customers. For Australian businesses looking to improve their digital marketing ROI, remarketing is not optional - it is essential. The visitors are already coming to your site. Remarketing makes sure they come back.