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How to optimise your images for SEO

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Always Optimise your images

Whether you are writing text for a website page or a blog article, you will find probably ask yourself whether you should include an image or not. The answer is YES!

Images are king, they bring a piece of writing to life and they also contribute to a website’s SEO.

So how to do you optimise your images for search engines?

How to Prepare your Images

Before you upload your images to your site, there are a few steps you should take. Get into the habit of doing this every time:

Rename your image

Image SEO starts with the file name.

You want Google to know what the image is so use your focus keyphrase in the image file name.

For example, if your image shows a picture of your staffy-puppy in a shoe – the file name should not be DSC1234.jpg – it should be staffy-puppy-in-a-shoe.jpg


Reduce your image size

Loading times are important for SEO. The faster the site, the better.

Images can have a huge impact on loading times so you should resize them to how you want it to be displayed.

Usually you know where you going to be putting the image on your site, so you know the size of the image needed.

For example – if it is for your home page slideshow, it will be 1600 pixels wide by around 800 pixels hight.

It is crazy to upload a huge image then display it really small – for example, uploading a 2500 × 1500 pixels image displayed at 250 × 150 pixels size – as the entire image still has to be loaded.

WordPress does have a feature whereby the image is automatically provided in multiple sizes after upload.

Resize your image

Please note – that doesn’t mean the file size is optimised as well – it is just the image display size.

Reduce your image file size

The next step is to make sure your scaled down image is compressed so it is the smallest file size possible.

You want to do this without loosing quality. Essentially, saving for the web is a balancing act — you must balance the quality of the graphics and the file size of the media to suit your personal needs.

PRO TIP: As a general rule of thumb, I would recommend general photos to be a maximum 80-150 KB, and large homepage hero images to be a maximum of 250-350 KB. Those are good benchmark numbers for you to aim for as well.

If you are using Photoshop you can use the SAVE FOR WEB option, which is great.

save for web

Image compression apps can also be used to reduce the file size of images – check out:

If you want to go a step further, once you’ve optimised your images, you can test your site with tools like Google PageSpeed or Pingdom.

Add the Alt Text (or alt tag)

Fill in the alt text for every image.

fill in the alt textThe alt text will show, if for some reason the image does not load.

Describe what is in the image & make sure it includes the SEO keyphrase for that page – this is important for Google.

In Summary

Image SEO is the sum of a number of elements. Each is important.

  • Rename your image
  • Resize your image
  • Reduce your image file size
  • Add the alt tag to your image


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