Last updated October 13, 2026 · Report an error
Alt text describes an image for screen readers and search engines — missing it hurts both accessibility for visually impaired visitors and image SEO, since search engines can't "see" an image the way a person can.
This tool fetches a live URL and reports exactly which images are missing an alt attribute.
How it works
Enter a page URL. The tool safely fetches the page and checks every <img> tag for an alt attribute — an image with alt="" (empty) is treated as intentionally decorative, not missing, since that's a valid, deliberate choice under the HTML spec; only a fully absent alt attribute is flagged.
- Enter page URL.
- Click Calculate to see your results.
Examples
A page with unlabeled images
If a page has 10 images and 3 have no alt attribute at all, the tool reports "3 of 10 images are missing an alt attribute."
Who should use it
- Auditing a page's accessibility before or after publishing.
- Finding image SEO gaps on an existing page.
Industry applications
- Web accessibility (WCAG compliance)
- SEO and content marketing
Advantages
- Checks the real, live page — not just a static copy of your HTML.
- Correctly distinguishes missing alt text from intentionally empty (decorative) alt text.
Limitations
- Only checks for the presence of alt text, not whether the wording itself is accurate or useful.
Common mistakes to avoid
- Leaving alt text off images entirely rather than using an empty alt="" for genuinely decorative images.
- Writing generic or keyword-stuffed alt text instead of an accurate, concise description.
Best practices
- Write alt text that describes what the image conveys to a sighted user, keeping it concise (a short phrase, not a full paragraph).
Tips
- Pair this with the Meta Tag Analyzer for a broader on-page SEO and accessibility check in one pass.