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Image SEO Guide: How to Optimise Images for Search Engines
Image SEO guide strategies help improve your website’s visibility, page speed, and search engine rankings. By optimising image file names, alt text, formats, and compression, you can create a better user experience while increasing organic traffic.
Images form a vital part of modern web design, enriching visual appeal and improving user engagement. However, unoptimised images are also one of the leading causes of slow page loading speeds and poor Google Core Web Vitals performance across UK business websites.
Quick Summary: Core Image SEO Rules
- Choose Next-Gen Formats: Use modern image formats like WebP or AVIF.
- Compress Aggressively: Aim to keep web image file sizes under 100KB to 200KB per image.
- Write Descriptive Alt Text: Provide clear, concise alt text that describes the image context for accessibility and search engines.
- Prevent Layout Shifts: Always declare explicit width and height dimensions on image tags.
Choosing the Right Image File Format
|
Format |
Best Use Case |
Compression Efficiency |
|---|---|---|
|
WebP |
General web images, blog photos, banners |
Very High (~25–35% smaller than JPG) |
|
AVIF |
Next-gen photography & complex graphics |
Extreme (~50% smaller than JPG) |
Image SEO Guide FAQs
What is the best image format for website SEO in 2026?
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