Image SEO
Image SEO covers alt text, file names, dimensions, formats, and lazy loading. Done well, it improves UX, indexing, and image search traffic.
Definition
Image SEO is the practice of making images easier to understand and faster to load: descriptive alt text, proper dimensions, modern formats (WebP/AVIF), compression, lazy loading, and preventing CLS.
Why it matters
- Images are often a major LCP and CLS driver
- Alt text improves accessibility and semantic understanding
- Image search and share previews can drive traffic
How to implement
- Write descriptive alt text (not keyword stuffing)
- Use correct sizes and modern formats with compression
- Reserve dimensions to avoid CLS and lazy-load offscreen images
Examples
html
<img src="/hero.webp" width="1200" height="630" alt="Free SEO tools preview" loading="lazy" />Related
Tutorials
Tools
FAQ
Common questions about this term.