Text on a page should provide the same information imparted by an image on a page.
Text in Images
Use plain text on a page instead of text embedded in an image.
Screen readers are unable to read text embedded in images. Alternatively, use alt text, but keep it at a reasonable length.
Alt Text
Add alt text to images.
Alt text helps add information that a screen reader can't otherwise glean from an image.
Keep alt text short and descriptive.
Alt text should not contain a paragraph of text.
Use an empty 'alt' tag for decorative images.
Images used for decoration don't need descriptive alt tags. Images that convey information do need descriptive alt tags or equivalent text on the page.
Use an empty 'alt' tag for images with descriptive plain text adjacent to them.
Images of a portrait photo of a person alongside their plain text name don't need to be described.