Alt Text Checker
Alt Text Checker is a tool that looks at the “alt” attribute for each image on the page and displays the image with the “alt” attribute in its context on the page as a plain text. The image is highlighted within the context and the real image is next to it. If the image has “longdesc” attribute, this will be linked to after the image. If there are missing “alt” attributes ,then this will be noted as an error.