Image Optimization Checker

It reviews image records captured by the crawl for missing or empty alt attributes, JPG, JPEG, PNG, BMP, TIFF, or TIF filename extensions, inline data strings over its 10,000-character threshold, and pages with more than 50 image records.

An informative image needs a concise text alternative that conveys its purpose in context. A functional image should describe the action or destination. Decorative or redundant images normally use alt="" so assistive technology can ignore them. The crawler cannot decide an image's purpose, so review both missing and empty values manually.

Choose a format based on the image, required transparency or animation, visual quality, browser needs, and measured transfer size. WebP and AVIF are useful options for many raster images; SVG suits scalable vector artwork. Compare actual encodings instead of assuming every JPG or PNG URL is inefficient.

Your first agent scan can be run without signing up. Page coverage depends on the account and plan, and crawl time varies by site. The checker reports selected image attributes and patterns found in the completed crawl; it may not include every image or establish visual quality and transfer cost.

There is no universal limit. This analyzer uses more than 50 captured image records as a review threshold, not proof that a page is heavy. Request count, dimensions, encoded bytes, responsive sources, caching, lazy loading, and which image becomes the LCP candidate all affect real performance.

This tool summarizes selected crawl fields across multiple pages. DevTools and performance tools can inspect rendered dimensions, selected responsive sources, response headers, transfer sizes, request timing, lazy loading, and content negotiation. Use the crawl report to find candidates, then verify performance in the browser.