Free WebP/AVIF Page Speed Calculator & HTML Lazy-Load Image Generator

Calculate how much page weight, mobile 4G load time, and monthly hosting bandwidth you save by converting JPEG and PNG images into WebP or AVIF—and generate Cumulative Layout Shift (CLS)-proof HTML <img> tags with one click.

How WebP & Lazy Loading Cut Hosting Bandwidth by 60%+

• Stay Under Free Hosting Bandwidth Caps: Compressing images to WebP reduces transfer size by ~62% without visible quality loss. Pair it with a Free WordPress CDN to offload static traffic completely.
• Pass Core Web Vitals (LCP & CLS): Always use fetchpriority="high" on your top hero banner and loading="lazy" on below-the-fold images.