Image Alt Text Checker
Short answer
Find images missing alt text and check existing alt attributes.
What It Does
Scans every <img> on the page and validates alt-text presence, decorative-image flagging via empty `alt=""`, and filename-as-alt patterns (alt text that just repeats the image filename). Returns a list of the images that need attention.
Why It Matters
Alt text is how screen reader users learn what an image shows, and WCAG 1.1.1 requires a text alternative for every meaningful image. Google also uses alt text, together with the page around it, to understand images for Google Images. Missing alt text fails the first group and gives the second less to go on.
How It Works
-
Enter a page URL or paste its HTML
-
We read every <img> element and its alt attribute from the HTML
-
Run quality rules: missing alt, empty alt (decorative), and filename-as-alt
-
Return alt-text coverage plus a list of the images missing proper alt text
Sample input + output
url: https://rankproof.eu/tools
images: 18 with alt: 17 OK empty alt (decorative): 1 OK missing alt: 0 OK filename-as-alt: 0 OK Coverage: 100%
Who Uses This
-
E-commerce Manager
Check product pages for images with no alt text or with the file name as alt text, a common catalogue default.
-
Accessibility Auditor
Check WCAG 1.1.1 alt-text coverage page by page and list every image without an alt attribute.
-
Content Editor
Check each page you publish to catch images uploaded without alt text before they pile up.
Frequently Asked Questions
When should alt text be empty?
For decorative images that add no informational value (background patterns, dividers). Use `alt=""` so screen readers skip them. Never omit the attribute entirely.
What makes good alt text?
A short phrase that describes what the image shows and why it is there. Skip "image of" or "photo of", and use a keyword only where it genuinely describes the image.
How does Google use alt text?
Google uses alt text, together with the page content, to understand what an image shows, which helps it show the image in Google Images. AI assistants that read a page can use it in the same way.
What about figure captions?
Captions (`<figcaption>`) complement alt text but don't replace it. Both should describe the image; alt is for screen readers, caption is for sighted users.