Optimize images for the web
Choose the right image format for your website — WebP, JPG, or PNG — and learn how format choice directly affects page speed and Core Web Vitals scores.
| Format | Compression | Transparency | Best for | Browser support |
|---|---|---|---|---|
| WebP | Lossy or lossless | Yes | Everything on the web | Chrome, Firefox, Edge, Safari 14+ |
| JPG | Lossy | No | Photographs, product images | Universal |
| PNG | Lossless | Yes | Logos, icons, screenshots | Universal |
Google's Lighthouse audit tool and Core Web Vitals both penalize pages that serve images in "legacy" formats (JPG, PNG) when WebP is available and supported. Switching from JPG to WebP reduces image payload by 25–35% — one of the highest-impact single-step web performance improvements available.
For photographs: Convert JPG to WebP. WebP achieves equivalent visual quality at 25–35% smaller file sizes. The resulting images load faster, consume less bandwidth on mobile, and improve your Largest Contentful Paint (LCP) score.
For logos and icons: Convert PNG to WebP. WebP lossless mode preserves full transparency and every pixel, while producing files 30–50% smaller than PNG. Transparent WebP replaces transparent PNG with no visual difference.
For older browser support: Safari supported WebP only from version 14.1 (2021). If you must support older Safari or Internet Explorer, use the HTML5 <picture> element with both WebP and JPG/PNG sources — browsers use the first format they support.
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