Image optimization is the process of reducing image file sizes without losing noticeable quality, while also making sure images are properly set up for SEO and accessibility. Large, unoptimized images are one of the most common reasons websites load slowly.
Why It Matters
- Faster page load times improve user experience and reduce bounce rates
- Google uses page speed as a ranking factor
- Properly labeled images can appear in Google Image Search and bring extra traffic
- Mobile users on slow connections especially benefit from smaller images
How to Optimize Images
- Compress before uploading: Use tools like Squoosh, TinyPNG, or ShortPixel
- Choose the right format: WebP is best for web images. JPG for photos, PNG for graphics with transparency
- Resize to the display size: Don’t upload a 4000px wide image if it displays at 800px
- Add alt text: Describe what the image shows for accessibility and SEO
WordPress Plugins for Image Optimization
- Smush: Automatically compresses images on upload
- ShortPixel: Converts to WebP and compresses in bulk
- Imagify: Easy optimization with detailed stats
Enable lazy loading so images only load when they’re about to scroll into view. WordPress enables this by default since version 5.5.
Related: Page Speed
