Image SEO Analyzer

How to use the image seo analyzer

1. Choose an image file.
2. Read the findings on size, dimensions and format.
3. Describe the image to get a suggested filename.

About this tool

Image SEO is mostly page speed wearing a different hat. An oversized photograph does not rank badly because a crawler disapproves of it — it ranks badly because it makes the page slow, and that is measured directly. So the checks here are about weight and dimensions first.

The useful rule of thumb: serve roughly twice the largest size the image is actually displayed at, which covers high-density screens, and stop there. A 4000-pixel photograph in a 600-pixel column is several megabytes spent on pixels nobody will ever see, and it is the single most common cause of a slow page.

Format matters nearly as much. WebP and AVIF typically save 25 to 50 per cent over JPEG at the same visual quality and are supported everywhere that matters now. A large PNG is usually a photograph in the wrong format — PNG is right for flat colour and transparency and expensive for anything else.

The filename is a genuine but small ranking signal and a much larger usability one: `IMG_2931.JPG` tells nobody anything once it has been downloaded into a folder. Hyphens rather than underscores, since search engines treat hyphens as word separators and underscores as joining characters, and lowercase because servers differ on case sensitivity.

Common uses

• Checking a photograph before putting it on a page.
• Working out why a page is slow to load.
• Renaming camera files into something meaningful.

Frequently asked questions

How large should a web image be?

Under about 200 KB for a full-width photograph and less for anything smaller, at roughly twice the largest displayed size to cover high-density screens.

Should I use WebP or AVIF?

Usually yes. Both typically save 25 to 50 per cent over JPEG at the same visual quality, and support is no longer a practical concern.

Does the filename affect ranking?

A little, and it affects usability more — a downloaded file called IMG_2931.JPG means nothing to anyone. Use hyphens, which are read as word separators.