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Image SEO Checklist

Review your images with an interactive checklist: format, weight, file names, markup, loading and indexing.

Privacy and cost

This tool runs in your browser. What you type or paste is not sent to our servers and it costs nothing to use.

How it works

  1. Go through the five sections: formats and weight, file names and URLs, HTML markup, loading performance, discovery and indexing.
  2. Tick what is already in place on your site; each item has a short explanation and an importance level.
  3. The weighted score gives more weight to high-impact actions, and the "Do these next" list suggests the next three.

Example

You tick "right display size", "compressed", "specific alt text" and "width/height set": that is 4 high-impact items out of 22, worth 12 of 41 weight points, a score of 29%. The list then suggests, in order: do not lazy-load the main image, serve photos as WebP or AVIF, then give files descriptive names.

What the result means

The items reflect widely accepted best practices and Google's image guidance (img elements, alt text, file names, formats, structured data). The score is this tool's own guide, not an official rating. Your ticks live on the page and are lost on reload: nothing is saved.

Common problems this tool helps with

  • Multi-megabyte images that slow pages down, especially on mobile.
  • Useful images inserted as CSS backgrounds, so not treated as content images.
  • Recurring omissions: alt text, dimensions, the main image being lazy-loaded.
  • Images blocked by robots.txt or impossible to discover in the HTML.

Frequently asked questions

Do images really affect SEO?

Yes, in two ways: they feed image search, and their weight and loading affect perceived speed and metrics such as LCP and CLS.

Which format should I choose first?

WebP or AVIF for photos, SVG for logos and icons. Keep a JPEG or PNG fallback only if you must support very old browsers.

Is an image sitemap required?

No. It mainly helps when images are injected by JavaScript or hosted on another domain. Images properly embedded in the HTML are already discovered.

Are my ticks saved?

No. The tool runs in your browser and stores nothing, so note your progress elsewhere if you want to keep it.

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