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Web Development
Image optimization is making images as small as possible without visible quality loss: right dimensions, modern formats like WebP and AVIF, and compression.
Images are usually the heaviest part of a page. Serving a 4,000-pixel photo where 800 pixels are shown wastes data and time.
Responsive images give each device a suitable size, and tools such as the Next.js Image component handle this automatically.
Example
Converting a site's PNG photos to WebP at the right sizes cuts total page weight from 6 MB to 900 KB.
Why it matters
Optimised images are often the single biggest improvement to load time and Core Web Vitals.
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Web Development
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