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  3. Image delivery optimizer
Your files stay on your device

Image delivery optimizer

Paste page HTML and audit its images for declared versus intrinsic size, lazy-loaded heroes, missing srcset, and format, with estimated byte savings per fix and a CSV download.

This tool is in beta

Still being tested. If a result looks wrong, tell us.

Report a problem

Paste page HTML and press Audit images.

The audit reads the HTML you paste and nothing else. Images inserted by JavaScript and backgrounds declared in external CSS stay invisible to it, and an image host without CORS headers still yields pixel dimensions from the image element but no byte count. Savings are published-baseline estimates, about 25 percent off JPEG and 26 percent off PNG for WebP, with oversized files scaled by pixel area; nothing is downloaded or re-encoded. Images you probe are fetched once from their own hosts and belong to their owners.

Page HTML

Resolves relative srcs like /img/hero.png so they can be measured
More settings▾
Up to 24 images, 8 s and 4.00 MB each

Measuring loads each image in this tab once: an image element for the pixel dimensions, and a cross-origin read for the byte count where the host allows one.

The paste stays within 200,000 characters and the first 60 img, picture source, and video poster references are audited. Lazy loading on the first 2 images in document order reads as a largest-contentful-paint problem.

This tool never fetches the page itself

CORS blocks reading another site's HTML from a browser tab, so the HTML comes from you. Save the page (or copy View Source) and paste it here; only the optional image measurements leave the tab.

Runs on this device. Nothing is uploaded.

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