Do not use images of text on your website except where absolutely necessary or for branding purposes (e.g. logo).
What to do?
- Make sure you don’t have any images of only text
- Avoid images that include text that conveys information if at all possible
- Graphs, screenshots, and diagrams which convey important information of more than just text are probably okay as images
- If you do have an image that includes text, add alt text and potentially a caption or description
Resources
Plain English Explanation
Avoid images of text as much as possible. Logos are fine.
If you do have an image that has text inside it, account for that information with alternative text or a description of the image.
If the same presentation can be made using only text (and not an image), never use an image.