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Image alt text checker
Enter a URL and we'll scan every <img> on the page for missing alternative text — one of the most common WCAG failures on the web. Free, instant, no signup required.
Why alt text matters
WCAG 1.1.1 (Level A) requires every non-decorative image to have a text alternative, so screen reader users, users browsing with images disabled, and search engines can understand what the image shows. Missing alt text is consistently the single most common accessibility failure found in large-scale audits — and one of the cheapest to fix.
What's the difference between alt="" and no alt attribute at all?
alt="" tells screen readers to skip a purely decorative image — that's correct and intentional. No alt attribute at all is a WCAG failure: screen readers typically fall back to reading the file name, which is usually meaningless.
Do decorative images need alt text?
No — purely decorative images (spacers, background flourishes) should use alt="" so screen readers skip them. Only meaningful, content-carrying images need descriptive alt text.
Does this tool check if my alt text is actually good?
No — this free checker only detects images with no alt attribute at all. Whether existing alt text is meaningful and accurate still requires a manual review; that's one of several checks in our full free scan.
Alt text is just one of 19 checks
Get a full WCAG report for this site — headings, form labels, link text, contrast and more — in one free scan, no signup required.
Run a free full scan →Heading structure checker · Link text checker · Color contrast · Methodology