How Images Affect Your SEO and What to Do About It

Most small business owners think of the images on their store purely in terms of how they look — but Google thinks about them very differently, and understanding that difference could meaningfully improve your rankings.

Images are not just visual elements that make your store attractive and your products easier to understand. They are pieces of data that search engines actively read, evaluate and use to determine the relevance, quality and ranking potential of every page they appear on. An image that is well-optimized — correctly named, properly compressed, accurately described, and appropriately sized — contributes positively to your store's SEO. An image that is poorly optimized — generically named, oversized, missing its alt text, and served in the wrong format — actively works against your rankings by slowing your pages down and giving search engines nothing meaningful to read.

This post builds on Post 32 — which covered the technical steps of image optimisation — and focuses specifically on the SEO dimension of images — why they matter for your search rankings, how Google reads and evaluates them, and what you can do right now to make every image on your store a positive SEO asset rather than a neutral or negative one.

Why Google Cannot See Your Images the Way You Can

When you look at an image, you see a product, a design, a person or a scene. When Google's search crawler encounters the same image, it sees a file — and without additional information, it has very little understanding of what that file contains or what it means in the context of the page it appears on. Google cannot interpret visual content the way human eyes and brains can — it relies entirely on the text-based signals associated with an image to understand what it shows and whether it is relevant to a given search query.

Those text-based signals — the file name, the alt text, the surrounding copy and the page context — are what determine whether your images contribute positively to your SEO or simply take up bandwidth without adding any ranking value. Every image on your store is an SEO opportunity — and most small business owners are leaving the vast majority of those opportunities unused.

5 Practical Steps to Make Your Images Work Harder for Your SEO

Step 1 — Name every image file with descriptive, keyword-rich text before uploading The file name of your image is the first piece of information Google uses to understand what the image shows — and it is also one of the most consistently neglected SEO signals on most small business stores. A file named IMG_4821.jpg or DALL_E_2024_product_image.webp tells Google absolutely nothing about the image's content. A file named business-budget-planner-template-small-business-owners.webp tells Google precisely what the image shows and who it is for — contributing to the relevance of the page for searches related to that product. Before uploading any image to your store, rename the file using descriptive, keyword-rich, hyphen-separated words that accurately describe the image content. This takes thirty seconds per image and accumulates into a meaningful SEO signal across your entire store over time.

Step 2 — Write specific, keyword-rich alt text for every single image Alt text — the written description of an image that appears in the HTML code of your page — is the most important SEO signal associated with any image. It serves two purposes simultaneously — it tells search engines what the image shows, contributing to the page's relevance for related search queries, and it is read aloud by screen readers for visually impaired users, making your store more accessible. Every product image, collection banner, blog post image and decorative graphic on your store should have alt text that describes the image specifically and includes your primary keyword naturally. Instead of leaving alt text blank or writing something generic like "product image," write something like "printable business budget planner template for small business owners PDF download." Specific, descriptive, keyword-rich alt text is one of the highest-value and most consistently underused SEO improvements available to any small business owner.

Step 3 — Compress every image to the smallest file size that maintains visual quality Page speed is a confirmed Google ranking factor — and images are the single largest contributor to slow page loading times on most small business stores. An oversized image file that takes three seconds to load is not just frustrating for your visitors — it is actively suppressing your Google rankings. Google's algorithm penalises slow pages and rewards fast ones, particularly on mobile devices where the majority of your customers are likely browsing. Compress every image you upload using free tools like TinyPNG, Squoosh or Shopify's built-in image compression — reducing file sizes without meaningfully affecting visual quality. A product image that starts at 3MB can typically be compressed to under 150KB with no visible difference to the customer — and the cumulative speed improvement across all your images can be transformative for both your user experience and your search rankings.

Step 4 — Use images strategically to support your keyword targeting on each page. Images do not just affect SEO through their own optimization — they also affect it through the way they support and reinforce the keyword targeting of the page they appear on. A product page targeting the keyword "content marketing calendar template for small business owners" should include images that visually demonstrate what the template looks like in use — showing the calendar layout, the planning structure and the professional design — because these images, with well-written alt text that includes the target keyword, strengthen the overall relevance of the page for that search term. Think of your images not just as visual aids but as active contributors to your keyword strategy — and choose, caption and describe them with that dual purpose in mind.

Step 5 — Use Google Search Console to identify image SEO opportunities you are missing Google Search Console's Performance report includes a filter for image search — allowing you to see which of your images are appearing in Google Image Search results, how many impressions and clicks they are generating and which image search queries your store is appearing for. This data reveals which products and pages have strong image search visibility — and which have none at all despite being relevant to high-volume image search queries. For any product or Resource Hub post that is generating significant text search traffic but minimal image search traffic, the likely cause is poorly optimized images — missing or generic alt text, unoptimized file names, or images that are too small or low-quality to rank competitively in image search. Use this data to prioritize your image optimization efforts on the pages where the opportunity is greatest.

Build Image SEO Into Your Broader SEO Strategy

Image optimization is one component of a complete SEO strategy — and like every other SEO improvement, it works best when it is part of a systematic, ongoing approach to improving your store's visibility and performance.

👉 SEO Strategy Worksheet → A structured worksheet to help you audit every aspect of your store's SEO — including your image optimization — and build a clear, prioritised action plan so every improvement you make is strategic, measurable and contributing to your overall goal of higher rankings, more traffic and more sales from your online store.