Page speed is a critical factor in both user experience and Google rankings. One of the highest-impact changes you can make is switching to WebP format for all images on your website. Here’s what you need to know and how to do it.
What Is WebP?
WebP is a modern image format developed by Google that provides superior compression for both lossy and lossless images. WebP images are typically 25-35% smaller than equivalent JPEG or PNG files with no visible quality loss.
Performance Benefits
- Faster page load times (especially on mobile)
- Reduced bandwidth usage and hosting costs
- Improved Google PageSpeed Insights scores
- Better Core Web Vitals (LCP improvement)
- Supported by all modern browsers including Chrome, Firefox, Safari, and Edge
Converting Images to WebP
You can convert images using command-line tools like cwebp (Google’s official encoder), or use online converters. For bulk conversion, a simple Python script using the Pillow library can process entire directories in seconds.
WordPress: Automatic WebP
From WordPress 5.8+, the platform natively generates WebP versions of uploaded images. Enable this by adding add_filter('wp_upload_image_mime_transforms', ...); or using plugins like Imagify, ShortPixel, or EWWW Image Optimizer. Always serve WebP with a JPEG/PNG fallback using the <picture> HTML element for maximum compatibility.
Quick Implementation Checklist
- Audit existing images with Google PageSpeed Insights
- Convert all static images to WebP format
- Configure your web server (Apache/Nginx) to serve WebP automatically
- Implement lazy loading for images below the fold
- Set appropriate cache headers for images
Ozlin Info delivers performance-optimised WordPress websites for Australian businesses. Get in touch to find out how we can speed up your site and improve your Google rankings.