RDS Learning and support
As per the guidance above, all images in your toolkit should be accompanied with image alt text. Guidance on how to write effective alt text can be found here.
The below video outlines how to add alt text to images on the RDS.
Tip
Alt text does not appear visibly on your toolkit. It is added as information associated with the image, so it will be picked up by visitors who use screen-reading software. If you would like text to appear with your image, you should insert this as a caption instead.