Free Image Alt Text Checker

What this tool checks

This tool scans every image on your page and evaluates alt text quality, missing dimensions, lazy loading configuration, modern format usage (WebP/AVIF), srcset responsive images, broken image sources, and SVG accessibility. It distinguishes between decorative images (which should have empty alt attributes) and content images (which need descriptive alt text).

Why it matters

Image alt text serves two critical purposes: accessibility and SEO. Screen readers rely on alt text to describe images to visually impaired users. Search engines use alt text to understand image content for image search rankings and as additional context for the page's topic. Missing alt text is one of the most common accessibility failures and a missed SEO opportunity.

Common issues we find

• Images with missing alt attributes, invisible to screen readers and search engines
• Generic alt text like 'image' or 'photo' that provides no useful description
• Alt text that's too long (over 125 characters), causing screen reader fatigue
• Decorative images missing empty alt="" attribute, cluttering screen reader output
• Broken image sources returning 404 errors