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Alt-Text Checker

Find images missing alt text on any page.

How it works

Enter a URL and the checker fetches the page and inventories every <img> element: which have alt text, which are missing the attribute entirely, and which are explicitly marked decorative with an empty alt, role="presentation", or aria-hidden.

It separates the real failures (no alt attribute at all) from the intentional ones (decorative images that screen readers should skip), and flags low-value alt text like raw filenames that helps nobody.

The per-image findings and coverage summary download as CSV or JSON, free and instant.

Frequently asked questions

Is an empty alt attribute a failure?

No — alt="" is the correct convention for purely decorative images. It tells screen readers to skip the image. The failure is a missing alt attribute, which forces assistive tech to guess or read the filename aloud.

Does alt text affect SEO or just accessibility?

Both. Alt text is the primary signal image search indexes, it stands in for images that fail to load, and it is a WCAG requirement — the same fix serves rankings, resilience, and accessibility at once.

What counts as low-value alt text?

Filename-style values like IMG_1234.jpg or single characters. They technically pass an attribute check but describe nothing — the checker flags them so you can replace them with a short description of what the image shows.

Accessible images. Authoritative site.

BuildSEO AI wins the verified backlinks that make accessible pages rank.

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