IImage Optimisation

Image optimisation is the process of reducing image file sizes whilst preserving visual quality. This involves selecting appropriate file formats (JPEG, PNG, WebP), compressing images, removing unnecessary metadata, and resizing images to match display dimensions. Optimised images load faster, use less bandwidth, and improve the overall performance of websites and mobile applications.

For businesses, image optimisation directly impacts user experience and bottom-line metrics. Pages with optimised images load faster, reducing bounce rates and improving conversion rates. Search engines like Google factor page speed into rankings, so optimisation improves SEO visibility. On mobile devices—where bandwidth is limited and loading speed matters most—optimised images are the difference between users staying and leaving. E-commerce sites, in particular, see measurable improvements in sales when images are properly optimised.

The technical approach involves several techniques working together. Modern formats like WebP deliver better compression than traditional JPEG or PNG. Responsive images serve different sizes to different devices (a smartphone gets a smaller image than a desktop screen). Lazy loading defers image loading until they're about to appear in the viewport. Tools like Lighthouse and Page Speed Insights identify unoptimised images and recommend improvements. Content Delivery Networks (CDNs) distribute images across servers globally, ensuring faster delivery regardless of user location.

Optimisation isn't a one-time task. As you add new content, images need consistent attention. Automated tools can help, but understanding the trade-offs between file size and quality ensures images look good whilst performing well. Modern web frameworks and hosting platforms now include built-in optimisation features, but custom approaches work better when you understand your specific audience and devices.