Pages with many images are at elevated risk of missing or poor alt text, which affects both accessibility and image-search traffic.
By Seoxpert Editorial · Published · Updated
Alt text serves two audiences at once. Screen readers announce it to visually impaired users — without it, the image is effectively invisible. Search engines use alt text as the primary signal for image indexing and as context for ranking the surrounding page content. It is one of the few HTML attributes that serves both accessibility and SEO directly.
Accessibility: sites failing alt-text coverage fail WCAG 1.1.1 (Non-text Content) and expose themselves to regulatory risk in jurisdictions like the US, UK, and EU. SEO: Google Image Search is the second-largest search product; missing alt text excludes the page entirely from image-driven traffic.
Scanner flags pages with more than 5 <img> elements as candidates for a manual alt-text review, since these are the pages where at-scale missing-alt issues are most likely to compound.
Good alt text — informational image
<img src="core-web-vitals-chart.png"
alt="Bar chart showing LCP, INP, and CLS thresholds — good, needs improvement, poor" />
<!-- Describes the content and purpose. Screen reader users know what they would see. -->Correct for decorative images
<img src="divider-line.png" alt="" role="presentation" />
<!-- Empty alt + role="presentation" tells screen readers to skip the image entirely. -->
<!-- Do NOT omit the alt attribute — that forces screen readers to read the filename. -->Bad patterns to avoid
<!-- Missing alt entirely — screen reader reads filename -->
<img src="team-photo-2026.jpg" />
<!-- Filename as alt text — worse than empty -->
<img src="team-photo-2026.jpg" alt="team-photo-2026.jpg" />
<!-- Keyword-stuffed alt (treated as spam) -->
<img src="hero.jpg" alt="best seo audit tool seo check seo scanner free" />As long as it needs to be to accurately describe the image — typically 5 to 15 words. Long enough to convey meaning; short enough to not slow down screen reader users.
No. Empty alt="" tells assistive tech the image is decorative and should be skipped. Missing alt makes the screen reader fall back to announcing the filename, which is almost always worse.
Include them naturally where they accurately describe the image. Stuffing keywords into alt text for SEO is ignored or penalised by Google and creates a worse experience for screen reader users.
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