Website Image Audit — find every wasted byte on any site

ImageAlchemy Pro audits any public web page and measures every image it loads. You get the total image weight, each file's real size, its format and caching headers, and a prioritised list of fixes with the bytes each one saves. It is the difference between "this file got smaller" and "these eleven files are costing you 1.4 seconds".

What the audit reports

• Every image on the page, measured — including srcset candidates, <picture> sources, preloaded images and CSS backgrounds.
• A weighted score out of 100, broken down by image weight, format, delivery and markup.
• A prioritised fix list — legacy formats, oversized files, missing lazy loading, absent width and height, weak cache headers, missing alt text.
• Core Web Vitals impact — estimated transfer time on a 4G connection, plus the layout-shift and largest-contentful-paint problems visible in the markup.
• A Markdown report you can paste into a ticket, a client email or a CMS.

Pricing

ImageAlchemy Pro is a one-time purchase. No subscription, no account, no expiry. The licence works offline in your browser. The free compressor — batch compression, conversion and resizing for up to 200 images — stays free forever, and your images never leave your device either way.

How to fix what the audit finds

Most findings are resolved by re-encoding to a modern format and right-sizing. The free ImageAlchemy compressor does both in your browser: see the WebP and AVIF format guides, the image resizer, or the guide to images and Core Web Vitals.

Compress images free · Optimization guides · Glossary