Optimising images for SEO

Guide to optimising images for SEO

Using images in your blog posts and on your website will help with SEO (search engine optimisation) providing you optimise them correctly.

When you’ve found the right image (check out some free image sources here) here’s how to optimise your image for SEO:

Select the right file name for your image

Use a descriptive filename for your image that also includes one of your SEO keywords.

Tips for naming images:

  • Keep it short (five words or less)
  • Leave out stop words (a, to, the, etc.)
  • Use hyphens (-) between each word

Scale and size your image

The load time of your website impacts on how your website ranks in search. Slow websites appear lower in the rankings. Scale your image to the size you want it to show on your website. The full size version will always be loaded first and then rescaled by the browser. Cut this step by scaling it before you add it to your website.

As well as scaling your image also reduce the file size. Make the image as small as possible without compromising quality. As a rule of thumb we aim to keep images below 100kB on this website.

To see how fast your website loads and where you need to make adjustments check out the Google Page Speed Insights Tool.

Fill in the Alt Text

The Alt Text displays when the image isn’t visible to the browser. It describes the image and is used by the search engine uses to understand images. Make sure the alt text includes your SEO keyword and describes the image.

Fill in the Caption

The caption is the text that accompanies the image. It normally sits in a grey box below the image.

Image captions don’t directly impact on SEO but are useful nonetheless. Image captions help people determine whether the content is likely to be relevant to what they are searching for. They should help reduce your bounce rate.

Next time you are uploading images to your website follow the four steps above to make them work in boosting your SEO.

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