Image SEO Guide
Alt Text Best Practices
โ Bad:
alt="image1.jpg"โ Bad:
alt="SEO keyword keyword keyword photo picture"โ Good:
alt="Red running shoes for women on white background"โ Good:
alt="Bar chart showing Q3 2024 revenue growth by region"File Naming Rules
โ IMG_20241201_083045.jpg
โ product photo (1).jpg
โ red-womens-running-shoes.webp
โ best-seo-tools-comparison-2024.png
Rules: lowercase, hyphens (not underscores), descriptive, include keywords naturally
Image Format Comparison
| Format | Best For | Compression | Browser Support |
|---|---|---|---|
| WebP | Photos, web images | 25-35% smaller than JPEG | 95%+ |
| AVIF | Next-gen photos | 50% smaller than JPEG | 80%+ |
| JPEG | Photos (legacy) | Good, lossy | 100% |
| PNG | Logos, transparency | Lossless, larger | 100% |
| SVG | Icons, illustrations | Scalable, tiny | 98%+ |
Image SEO Checklist
- โ Descriptive alt text (max ~125 chars)
- โ Keyword-rich file name with hyphens
- โ Compress images (target <100KB for most)
- โ Serve modern formats (WebP/AVIF with JPEG fallback)
- โ Add width/height attributes to prevent layout shift
- โ Use lazy loading for below-fold images
- โ Submit image sitemap
- โ Add structured data for product images