Google Image Search is used 1 billion times per day. Yet most website owners put almost no effort into ranking their images. This guide covers every factor that determines where your images appear in Google Image Search results.
| Factor | Weight | How to Optimise |
|---|---|---|
| Alt text | Very High | Descriptive, keyword-rich, unique per image |
| Image filename | High | Descriptive words, hyphens between words |
| Surrounding text | High | Write captions and nearby text that reinforces image content |
| Page title and H1 | Medium | Ensure page topic matches image content |
| Page authority | Medium | Build links to pages containing your images |
| Image quality | Medium | High resolution, properly exposed, in focus |
| Page load speed | Medium | Compress images, use lazy loading |
| Structured data | Low-Medium | Add ImageObject schema to key images |
Google doesn't just read your alt text in isolation. It reads the entire page to understand what your image is about. An image with the alt text "red apple" on a page about apple nutrition will rank better for relevant apple queries than the same image on an unrelated page.
This means your image SEO strategy and your content strategy must be aligned. Images should illustrate the content on the page — not be randomly placed.
An image sitemap tells Google about images it might not discover through normal crawling — especially images loaded via JavaScript. Add image data to your sitemap like this:
<image:image><image:loc>https://example.com/photo.jpg</image:loc><image:title>Red apple on white background</image:title></image:image>
ImageObject schema tells Google additional metadata about your images beyond what alt text conveys. For recipes, products, and articles, including ImageObject schema can earn rich results in Google Images.
Google's Core Web Vitals include Largest Contentful Paint (LCP) — often caused by slow-loading hero images — and Cumulative Layout Shift (CLS) — often caused by images without specified dimensions. Both affect overall page ranking, which in turn affects image search rankings.
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