Image Alt Text Character Limit. Alt text cannot be longer than 250 characters. The descriptors are by necessity quite long.
Use your keywords alt text provides you another opportunity to include your target keyword on a page and thus another opportunity to signal to search engines that your page is highly relevant to a particular search query. Alt text should not contain file extensions such as jpg. You don t need to describe everything in the image or describe it in a decorative way.
Convey the meaning the image is conveying to the reader.
It should be easily readable and describe what is happening in the image. Do not repeat the surrounding textual content as alt text or use phrases referring to images such as a graphic of or an image of in the example below the alt text is referring to the image and does not describe the content of the image sufficiently. Expect google to count a maximum of 16 words approximately 125 characters as part of your alt text that will be a signal used to rank your page for a relevant query. How to seo alt text.