WordPress is the platform powering 43% of all websites — and poorly optimised images are the number one performance issue across most WordPress sites. Uploading correctly sized, properly compressed images before uploading to WordPress saves server storage, reduces CDN costs, and improves Google PageSpeed scores. At imgresizr.com, you can optimise images before WordPress upload, for free.
WordPress Image Size Guide
| Use Case | Recommended Size |
|---|---|
| Featured image | 1200×628px |
| In-post content image | 800–1200px wide |
| Background image | 1920×1080px |
| WooCommerce product | 800×800px square |
| Author photo | 300×300px |
How to Optimise Images for WordPress at imgresizr.com
Upload your image to imgresizr.com. For the featured image (shown in blog listings and social shares), resize to 1200×628px — the optimal Open Graph image size. For in-content images, resize to your theme's content width (typically 800–1200px) — wider images just get scaled down and waste storage. Convert photographs to WebP using the Convert tool — WordPress has supported WebP natively since version 5.8. Compress to 80% quality for photographs and 90% for graphics using the Compress tool — target under 500KB per image before upload. For WooCommerce product images, use 800×800px square format. WordPress will still generate its standard thumbnail sizes from your optimised source — so start with the best quality image you can provide within the size constraints.
WordPress Image Optimisation Tips
- Optimise before upload — regenerating thumbnails from oversized source images wastes server resources
- Use a caching plugin (WP Rocket, W3 Total Cache) to serve optimised images with cache headers
- Set appropriate Media Settings (Settings > Media) to limit the sizes WordPress generates
- Use descriptive file names before uploading — good_image_seo_filename.jpg not DSC00142.jpg
- Always include descriptive alt text for accessibility and image SEO
Optimise images for WordPress before uploading, free at imgresizr.com.