Image Optimiser

Check up to 40 images on a page for missing or poor alt text, large files, old formats, missing width and height, wrong lazy-loading, srcset and generic file names. Get a prioritised fix list.

The first 40 images on the page are checked.

How to use the Image Optimiser

  1. 1

    Enter the URL of a page with images.

  2. 2

    Click Check images to test up to 40 images.

  3. 3

    Work through the prioritised fixes, starting with the top image and large files.

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Frequently asked questions

How big should images be for the web?

Most content images can be under 100-150 KB when resized to their display size and saved as WebP or AVIF. Hero images may be a little larger.

Should every image have alt text?

Every image needs an alt attribute. Describe content images in a short sentence; use alt="" (empty) only for decorative images so screen readers skip them.

Should I lazy-load all images?

No. Lazy-load images further down the page, but never the first visible (hero) image: that delays the Largest Contentful Paint.

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