Image SEO Guide
Alt Text Best Practices
✗ Bad:
alt="image1.jpg"✗ Bad:
alt="SEO keyword keyword keyword photo picture"✓ Good:
alt="Red running shoes for women on white background"✓ Good:
alt="Bar chart showing Q3 2024 revenue growth by region"File Naming Rules
✗ IMG_20241201_083045.jpg
✗ product photo (1).jpg
✓ red-womens-running-shoes.webp
✓ 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
- ☐ Descriptive alt text (max ~125 chars)
- ☐ Keyword-rich file name with hyphens
- ☐ Compress images (target <100KB for most)
- ☐ Serve modern formats (WebP/AVIF with JPEG fallback)
- ☐ Add width/height attributes to prevent layout shift
- ☐ Use lazy loading for below-fold images
- ☐ Submit image sitemap
- ☐ Add structured data for product images