Image SEO.
Learn what Image SEO means in modern search and SEO.
Optimising images on a website for search engine understanding, faster loading, and visibility in image search results.
Image SEO encompasses all optimisation practices applied to images on a website: descriptive file naming, accurate alt text, appropriate file size and format, structured data, responsive sizing, and contextual relevance. Optimised images improve page performance (a primary ranking factor), help search engines understand page content, and drive traffic through Google Images search.
Core Image SEO Practices
Essential image SEO practices: descriptive file names (use 'seo-reporting-dashboard.webp', not 'IMG_1234.jpg'); accurate, descriptive alt text that describes the image for screen readers and search engines (not keyword-stuffed, genuinely descriptive); modern image formats (WebP or AVIF instead of JPEG/PNG for 25-35% smaller file sizes); explicit width and height attributes in HTML (prevents CLS); lazy loading for below-fold images (improves LCP); and responsive images using `srcset` for different device sizes.
Image Search Traffic
Google Images drives meaningful traffic for e-commerce, recipe sites, design portfolios, and any domain where visual content has high standalone search value. To rank in image search: ensure images are unique and original (stock photos rarely rank); match alt text with actual image content; host images on relevant, authoritative pages with strong surrounding text context; implement ImageObject schema where appropriate; and submit an image sitemap to help Google discover all images.
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