How to Optimize Images for SEO
Optimize images for search engine visibility and faster page loads. Learn about alt text, file naming, compression, responsive images, lazy loading, and structured data for image SEO.
Compress Image
Reduce image file size while keeping quality.
Image SEO Fundamentals
Images appear in Google Image Search, generate traffic, and affect page ranking through Core Web Vitals. Properly optimized images load fast, are discoverable by search engines, and provide context to crawlers.
Key Optimization Factors
File Names
Use descriptive, keyword-rich file names separated by hyphens: blue-mountain-sunrise.jpg instead of IMG_4532.jpg. Search engines use file names as ranking signals.
Alt Text
Write descriptive alt attributes that explain the image content. Alt text serves screen readers and helps search engines understand the image. Keep it under 125 characters.
File Size & Format
Use WebP or AVIF for the best compression-to-quality ratio. Aim for images under 200KB for standard content images and under 100KB for thumbnails.
Responsive Images
Use srcset and sizes attributes to serve appropriately sized images for each device width. This prevents mobile devices from downloading desktop-sized images.
Quick Checklist
- Descriptive file name with target keywords
- Alt text describing image content (not stuffed with keywords)
- Compressed to under 200KB using WebP or optimized JPEG
- Correct dimensions (do not rely on CSS to resize)
- Lazy loading with
loading="lazy"for below-fold images