Guide to Ecommerce PPC & Shopping Ads

If you run an online store and want to drive more sales, paid search advertising offers one of the most direct routes to reaching customers who are actively looking to buy. This ecommerce PPC guide covers everything you need to know about running successful shopping ad campaigns, from understanding the fundamentals through to platform-specific strategies for Google and Microsoft Ads.

As part of a broader ecommerce marketing strategy, PPC and shopping ads can deliver immediate, measurable results while you build longer-term organic visibility. Whether you are new to paid advertising or looking to refine your existing approach, this guide will walk you through how to structure campaigns, optimise product feeds, and measure what matters.

What Is Ecommerce PPC and How Does It Work?

PPC, or pay-per-click advertising, is a model where you pay each time someone clicks on your ad. For ecommerce businesses, this typically means showing product listings or text ads to shoppers searching for items you sell.

Unlike organic search results, which take time to build, PPC places your products in front of potential customers immediately. You bid on keywords or product categories, and when a shopper’s search matches your targeting, your ad can appear in the search results or shopping sections of search engines.

The core principle is straightforward: you only pay when someone clicks through to your site. This makes PPC a measurable and controllable channel where you can tie spend directly to traffic and, with proper tracking, to sales.

For online retailers, the most valuable form of PPC is often shopping ads. These display your product image, title, price, and store name directly in search results, giving shoppers the information they need to make a purchase decision before they even visit your site.

Why Shopping Ads Matter for Online Retailers

Shopping ads have become the dominant ad format for ecommerce businesses, and for good reason. They appear prominently at the top of search results, often above text ads, and they show visual product information that helps qualified buyers find what they want. For online retailers serious about growth, ecommerce shopping ads represent one of the most direct routes to increased sales.

Key benefits of shopping ads include:

Visual product display that catches attention and communicates value quickly
Pre-qualified traffic because shoppers see your price and product image before clicking
Higher purchase intent compared to generic text ads, since users searching for products are often ready to buy
Broader keyword coverage without needing to bid on every individual search term, as ads are matched based on your product feed

Shopping campaigns work differently from traditional keyword-based PPC. Instead of bidding on specific search queries, you submit a product feed containing details about your inventory. The advertising platform then matches your products to relevant searches based on the information in your feed.

This makes your product feed the foundation of shopping ad success. The quality and completeness of your feed data directly affects which searches trigger your ads and how well they perform.

Understanding How Paid Search Works for Ecommerce

Before going further in this paid search guide, it helps to understand the mechanics behind how ads are selected and displayed. Both Google and Microsoft use auction systems to determine which ads appear and in what position.

When someone searches for a product, the platform runs an instant auction among all advertisers whose products or keywords match that query. The auction considers several factors:

Your bid amount represents the maximum you are willing to pay for a click. Higher bids can improve your chances of winning the auction, but they are not the only factor.

Quality and relevance play a significant role. Platforms reward advertisers whose ads and landing pages provide a good user experience. For shopping ads, this includes having accurate, detailed product information and a website that loads quickly and functions well.

Expected impact is calculated based on historical performance data. If your ads have strong click-through rates and your products convert well, platforms will favour showing your ads more often.

The actual amount you pay per click is usually less than your maximum bid. You pay just enough to beat the next highest bidder, adjusted for quality differences. This means improving your ad quality can reduce your costs while maintaining or improving your position.

Google Shopping Ads: Platform Overview

Google Shopping remains the largest shopping ads platform for UK retailers. Products appear in the dedicated Shopping tab, within standard search results, and across Google’s partner network including YouTube and Gmail.

Setting Up Google Merchant Centre

Before running Google Shopping campaigns, you need a Google Merchant Centre account. This is where you upload and manage your product feed. Merchant Centre validates your product data, checks that your website meets Google’s requirements, and connects to your Google Ads account.

Requirements for Merchant Centre include:

A verified and claimed website URL
Accurate business information including contact details and return policy
Product data that matches what appears on your website (prices, availability, and product details must be consistent)
Compliance with Google’s shopping policies, which cover prohibited products, misleading claims, and content standards

Once your Merchant Centre account is approved and your feed is processing correctly, you can create shopping campaigns in Google Ads.

Google Shopping Campaign Types

Google offers several campaign types for shopping ads, each with different levels of automation and control.

Standard Shopping campaigns give you the most control over bidding, product grouping, and targeting. You can segment products by category, brand, price range, or custom labels, then set different bids for each group. This approach works well when you have clear data about which products perform best and want to allocate budget accordingly.

Performance Max campaigns use machine learning to show your products across all Google channels, including Search, Shopping, Display, YouTube, and Discovery. You provide assets like images, headlines, and descriptions, and Google’s system determines where and when to show your ads. Performance Max requires less manual management but offers less transparency into exactly where your ads appear and how budget is allocated.

Smart Shopping campaigns (being phased into Performance Max) combine standard shopping with automated remarketing. If you are currently running Smart Shopping, Google will migrate these to Performance Max.

For most ecommerce advertisers, a combination of Standard Shopping for your best-performing products and Performance Max for broader reach offers a balanced approach.

Google Shopping Bidding Strategies

Choosing the right bidding strategy depends on your goals and how much data your campaigns have accumulated.

Manual CPC lets you set specific bids for product groups. This gives you full control but requires regular monitoring and adjustment. Manual bidding works well when you are learning which products perform best or when you have very specific margin requirements.

Target ROAS (Return on Ad Spend) tells Google to aim for a specific return on your ad investment. If you set a target ROAS of 400%, Google will try to generate £4 in revenue for every £1 spent. This strategy requires sufficient conversion data to work effectively, typically at least 15 to 20 conversions per month.

Maximise Conversion Value aims to generate the most revenue possible within your budget, without a specific ROAS target. This can be useful when you want to grow sales and are willing to accept some variation in efficiency.

Maximise Clicks focuses on driving traffic rather than conversions. This is rarely the best choice for ecommerce unless you are gathering initial data or running a specific awareness campaign.

Microsoft Advertising: An Alternative Worth Considering

While Google dominates the UK search market, Microsoft Advertising (formerly Bing Ads) reaches a significant audience that many competitors overlook. Microsoft’s network includes Bing, Yahoo, and AOL search, plus partner sites.

Why Microsoft Ads Deserve Attention

The audience on Microsoft’s network often skews slightly older and has higher household income compared to Google users. For certain product categories, particularly home goods, finance products, and premium items, Microsoft can deliver strong results.

Advantages of Microsoft Shopping include:

Lower competition often means lower cost per click
Import tools make it easy to copy Google campaigns directly into Microsoft
Integration with LinkedIn allows for B2B targeting options not available elsewhere
Windows devices and Microsoft Edge default to Bing, providing consistent search volume

Setting Up Microsoft Merchant Centre

Microsoft has its own Merchant Centre for hosting product feeds. You can either upload a separate feed or use the import feature to pull your existing Google Merchant Centre data. The import option saves time and keeps your Microsoft campaigns aligned with Google.

Product requirements are similar to Google, though Microsoft has some different policies around certain categories. Check their advertising policies if you sell products in regulated industries.

Microsoft Shopping Campaign Structure

Microsoft offers Standard Shopping campaigns with manual control and Smart Shopping campaigns with automation. The interface and options closely mirror Google, making it straightforward for advertisers already familiar with Google Shopping.

One useful feature is the ability to target by LinkedIn profile data, including company, industry, and job function. For B2B ecommerce or high-value consumer products, this targeting can help reach decision-makers.

Product Feed Optimisation: The Foundation of Shopping Success

Your product feed is the single most important factor in shopping ad performance. Every piece of data you provide affects whether your products appear for relevant searches and how they are displayed.

Essential Feed Attributes

While platforms accept many optional attributes, certain fields are required and directly impact performance:

Product title is the most influential field for search matching. Include key descriptive terms that shoppers use when searching. Put the most important information first, as titles may be truncated in some placements.

A good product title structure often follows this pattern: Brand + Product Type + Key Attributes (colour, size, material, model).

For example, “Nike Air Max 90 Men’s Running Shoes White Size 10” is more effective than “Running Shoes” or even “Nike Shoes White”.

Product description provides additional context for matching and appears in some ad formats. Write naturally and include relevant details that did not fit in the title. Avoid keyword stuffing, which can harm performance.

Google Product Category and Product Type help platforms understand what you sell. Use the most specific category available. If you sell women’s leather ankle boots, categorise them as such rather than simply “footwear”.

Images should be high quality, show the product clearly, and meet platform specifications. Use clean backgrounds (white or light grey works well for most products). Avoid watermarks, promotional text, or multiple products in a single image unless selling a bundle.

Price and availability must match your website exactly. Mismatches cause feed disapprovals and erode shopper trust.

Advanced Feed Optimisation Techniques

Beyond the basics, several techniques can improve feed performance:

Custom labels let you tag products with your own classifications, such as margin level, seasonality, or bestseller status. You can then use these labels to structure campaigns and adjust bids. For instance, you might bid higher on high-margin products or create separate campaigns for seasonal items.

Supplemental feeds allow you to add or override attributes without changing your primary feed. This is useful for testing title variations or adding custom labels without modifying your website’s data export.

Feed rules in Merchant Centre can transform data automatically. If your product titles are too short, you can create rules to append category or brand information. If sizes are formatted inconsistently, rules can standardise them.

Regular feed updates keep your data fresh. Most successful advertisers update their feed at least daily, with more frequent updates for businesses with rapidly changing inventory or prices.

Campaign Structure and Organisation

How you structure your shopping campaigns affects your ability to control bids, allocate budget, and analyse performance.

Structuring by Product Performance

One effective approach is separating products based on historical performance. Create campaigns or ad groups for:

Top performers that consistently generate profitable sales and deserve maximum visibility
Testing products including new items or those with limited data
Low performers that need reduced bids or exclusion while you investigate why they underperform

This structure lets you allocate budget toward proven winners while limiting spend on uncertain inventory.

Structuring by Product Category or Brand

For larger catalogues, organising by category or brand makes management more practical. This approach works well when different product lines have different margin profiles or competitive dynamics.

You might have separate campaigns for each major category, with ad groups breaking down further by brand or price point. This gives you flexibility to set category-level budgets and adjust bids based on category-specific performance.

Using Negative Keywords in Shopping Campaigns

Although shopping campaigns are feed-based rather than keyword-based, you can still add negative keywords to prevent your ads showing for irrelevant searches.

Review your search terms report regularly to identify queries that trigger your ads but do not convert. Common negative keywords for ecommerce include:

“Free” or “cheap” if you sell premium products
Competitor brand names if you do not carry those products
Terms indicating research rather than purchase intent, such as “reviews” or “comparison”
Irrelevant product variations you do not offer

Adding negative keywords improves efficiency by focusing spend on searches more likely to convert.

Bidding and Budget Management

Effective bid management balances visibility with profitability. Your approach will depend on your business goals, margins, and how much data you have.

Setting Initial Bids

When launching new campaigns, you need enough data to understand performance before optimising aggressively. Start with moderate bids that will generate meaningful traffic volume without overspending.

Consider your product margins when setting bids. If a product sells for £50 with a £20 margin, and you need at least a 400% ROAS to be profitable, your maximum sensible cost per acquisition is £12.50. Work backwards from there to estimate a starting CPC that could achieve that target.

Adjusting Bids Based on Performance

Once you have conversion data, adjust bids to improve results:

Increase bids for products with strong ROAS that could benefit from more visibility
Decrease bids for products with poor ROAS or low conversion rates
Exclude products that consistently fail to convert despite optimisation attempts

Bid adjustments should be gradual. Large sudden changes can disrupt campaign learning and lead to volatile performance.

Device and Location Bid Adjustments

Both Google and Microsoft allow bid modifications based on device type and geographic location. If your data shows that mobile users convert at lower rates, you might reduce mobile bids. If certain regions outperform others, increase bids for those areas.

These adjustments add another layer of optimisation but require sufficient data to identify genuine patterns rather than random variation.

Measuring Success: Key Metrics for Ecommerce PPC

Tracking the right metrics helps you understand whether your campaigns are working and where to focus improvement efforts. Proper analytics and measurement setup is essential for making informed decisions about your paid search investment.

Revenue and ROAS

For most ecommerce advertisers, return on ad spend is the primary success metric. ROAS measures how much revenue you generate for each pound spent on advertising.

ROAS = Revenue from Ads ÷ Advertising Spend

A ROAS of 500% means you generate £5 in revenue for every £1 spent. Whether this is profitable depends on your margins. A business with 50% gross margins can be profitable at 200% ROAS, while a business with 20% margins might need 500% or higher.

Conversion Rate and Average Order Value

Conversion rate measures the percentage of visitors who complete a purchase. Low conversion rates might indicate issues with your landing pages, pricing, or product relevance.

Average order value (AOV) affects how much you can afford to pay for each click. Higher AOV generally supports higher CPCs while maintaining profitability.

Impression share shows what percentage of available impressions your ads captured. If your impression share is low, you are missing opportunities.

Lost impression share (budget) indicates you are running out of daily budget before all potential impressions are served. You might increase budget for profitable campaigns or reduce bids to spread budget further.

Lost impression share (rank) suggests your bids or quality are not competitive enough. Improving your feed quality or increasing bids could help capture more impressions.

Click-Through Rate

CTR measures how often people click your ad after seeing it. Higher CTR indicates your products and prices are appealing to searchers. Low CTR might suggest your products are not well-matched to the searches triggering them, or that competitors have more attractive offers.

Common Challenges and How to Address Them

Running shopping campaigns is not without difficulties. Here are some frequent issues and practical solutions.

Products Not Showing or Limited Visibility

If your products are approved but barely appearing in search results, consider:

Bid competitiveness: Your bids may be too low for the auction. Increase bids and monitor impression share.
Feed quality: Thin or generic product titles reduce matching opportunities. Expand titles with relevant descriptive terms.
Budget constraints: Daily budgets running out early limit visibility. Increase budget or reduce bids to extend coverage.
Policy issues: Check Merchant Centre for any warnings or limited product approvals.

High Traffic but Low Conversions

Clicks without conversions drain budget without generating return. Investigate:

Landing page experience: Does your product page load quickly? Is the purchase process straightforward? Mobile-friendliness matters significantly.
Price competitiveness: Shoppers compare prices easily. If competitors consistently undercut you, consider whether your ads are reaching the right audience.
Search term relevance: Review which queries trigger your ads. Irrelevant searches generate wasted clicks.
Product feed accuracy: Ensure images, prices, and descriptions match your website. Mismatches frustrate shoppers and kill conversions.

Feed Disapprovals and Policy Violations

Disapproved products cannot show ads. Common causes include:

Price or availability mismatches between feed and website
Missing required attributes like GTIN, brand, or condition
Policy violations for prohibited or restricted products
Image quality issues such as watermarks or promotional overlays

Merchant Centre provides specific disapproval reasons. Address each issue systematically and request re-review once fixed.

Integrating Shopping Ads with Your Broader Marketing Strategy

Shopping ads work best as part of a coordinated marketing approach rather than in isolation.

Combining PPC with SEO

Paid and organic search are complementary. PPC provides immediate visibility while ecommerce SEO builds long-term presence. Products that perform well in PPC often benefit from additional SEO attention to capture more organic traffic.

Use PPC data to inform SEO priorities. Search terms that drive profitable paid traffic indicate valuable organic opportunities.

Remarketing to Previous Visitors

Not every shopper converts on their first visit. Remarketing campaigns let you show ads to people who have previously visited your site, reminding them of products they viewed or added to cart.

Dynamic remarketing shows specific products someone browsed, while standard remarketing uses general messaging. Both can improve conversion rates by re-engaging interested shoppers.

Shopping ads reach people actively searching, but paid social advertising can introduce your products to new audiences. Platforms like Facebook, Instagram, and TikTok offer catalogue-based ad formats similar to shopping ads.

Cross-channel campaigns that combine search and social often outperform single-channel approaches by reaching customers at different stages of their buying journey.

Getting Started with Ecommerce PPC

Taking your first steps with shopping ads and paid search can feel overwhelming. There are platforms to learn, feeds to configure, campaigns to structure, and metrics to track. Whether you choose to manage campaigns yourself or work with specialists, having a clear starting point makes the process more manageable.

If You Are Managing Campaigns In-House

For businesses handling PPC internally, focus on building strong foundations before worrying about advanced tactics:

1. Get your product feed right first. Check that all products are approved, titles are descriptive and keyword-rich, and images meet quality standards. Fix any disapprovals or data gaps before spending on ads.

2. Start with a simple campaign structure. You can add complexity later. Begin with one campaign covering your main product range, then segment as you gather performance data.

3. Set up conversion tracking properly. Without accurate tracking, you cannot measure success or make informed decisions. Confirm that purchases are being recorded with correct revenue values.

4. Monitor search terms regularly. Review which queries trigger your ads and add negative keywords to block irrelevant traffic.

5. Benchmark your starting position. Know your current ROAS, conversion rate, and impression share so you can measure improvement over time.

6. Make gradual changes. Avoid dramatic bid swings or wholesale restructures. Test adjustments methodically and give campaigns time to respond before drawing conclusions.

Why Working with a PPC Agency Makes Sense

While managing campaigns yourself is certainly possible, many ecommerce businesses find that partnering with a specialist paid search agency delivers better results and frees up internal resources for other priorities.

Access to expertise and experience. Agency teams work across multiple accounts and industries, giving them insight into what works and what does not. They have seen the mistakes that cost money and know the optimisations that drive results. This experience translates into faster improvements and fewer costly errors.

Staying current with platform changes. Google and Microsoft regularly update their advertising platforms, introducing new features, changing policies, and adjusting how auctions work. Keeping up with these changes is a job in itself. Agencies dedicate time to understanding updates and adapting strategies accordingly, so you benefit from new opportunities without needing to track every announcement.

Time savings for your team. Effective PPC management requires daily attention. Monitoring performance, adjusting bids, reviewing search terms, testing ad variations, and troubleshooting issues all take time. For most businesses, those hours are better spent on product development, customer service, or other activities that directly grow the business.

Better tools and technology. Agencies invest in software for feed management, bid optimisation, competitor analysis, and reporting. These tools improve campaign performance but often cost more than makes sense for a single business to purchase independently.

Objectivity and accountability. External partners bring fresh perspective to your campaigns. They can identify opportunities or problems that someone too close to the business might miss. Clear reporting and performance targets also create accountability that drives continuous improvement.

Scalability as you grow. When your business expands into new markets or product lines, agency teams can scale campaigns accordingly. They have the capacity to manage increased complexity without the delays of hiring and training new staff.

What to Look for in an Ecommerce PPC Partner

Not all agencies are equally suited to ecommerce advertising. When evaluating potential partners, consider:

Ecommerce-specific experience: Managing shopping campaigns and product feeds requires different skills than running lead generation PPC. Look for proven results with online retailers.
Platform partnerships: Google Premier Partner and Microsoft Advertising Partner status indicate that an agency meets platform standards for performance and certification.
Transparent reporting: You should receive clear, regular reports showing performance against agreed targets. Avoid agencies that obscure results or make data difficult to access.
Strategic approach: The best partners do more than execute tactics. They help you develop a strategy that aligns PPC with your broader business goals.
Cross-channel capability: If you want to expand into paid social or coordinate with SEO efforts, working with an agency that offers integrated services simplifies management and improves consistency.

Taking the Next Step

Shopping ads and ecommerce PPC remain among the most effective ways to reach customers who are ready to buy. The principles covered in this guide provide a foundation for success, whether you implement them yourself or work with specialists.

If you are looking for support with your ecommerce PPC campaigns, whether that is a full account audit, help with feed optimisation, or ongoing campaign management, our paid media team has extensive experience helping online retailers grow their sales through paid search and shopping ads.

Get in touch with our team to discuss how we can help improve your ecommerce advertising results.