Image Alt Text Checker
Find images with missing alt text, missing dimensions and no lazy loading.
About the Image Alt Text Checker
Alt text is a short written description of an image, added with the alt attribute. Screen readers read it aloud to blind and low-vision visitors, browsers show it when an image fails to load, and search engines use it to understand what the image shows – which is how images rank in Google Images.
This checker lists every image on a page with its alt text, its width and height attributes and its loading mode. Missing alt attributes are errors; an empty alt (alt="") is correct for decorative images, so it is shown separately. Missing dimensions are flagged too, because images without width and height make the layout jump as they load, which hurts the Cumulative Layout Shift (CLS) score.
Frequently asked questions
What makes good alt text?
Describe what the image shows and why it is there, in plain words and usually under 125 characters. “Barista pouring latte art into a white cup” is better than “coffee image” or a list of keywords.
Should every image have alt text?
Every image needs an alt attribute, but decorative images (dividers, background flourishes) should have an empty one: alt="". That tells screen readers to skip them.
Does alt text help SEO?
Yes. It is the main way Google understands image content for Google Images, and it adds relevant context to the page. Its bigger benefit is accessibility.