Alt Attribute Checker

The Alt Attribute Checker analyzes all img tags in your HTML source code instantly by pasting the code into the text area. It provides a comprehensive list of each image's alt attribute status with advanced quality analysis, without requiring complex setup or external tools.

Alt attributes play a critical role in both SEO and accessibility. In Google Image Search, alt text is a key signal for understanding image content, and proper configuration can significantly increase traffic from image search results. WCAG (Web Content Accessibility Guidelines) requires alt attributes on all meaningful images to ensure web accessibility standards compliance.

Users with visual impairments who use screen readers rely on alt text to understand image content. Proper alt attributes are fundamental to creating web experiences accessible to all users.

This tool evaluates each image's alt attribute status as 'present', 'empty', or 'missing', and performs comprehensive quality checks. It detects alt text that is too short (under 10 characters), too long (over 125 characters), or contains only filenames. The tool identifies duplicate alt text across multiple images and calculates an overall alt coverage score for your entire site.

Built-in sample presets (Good Examples and Bad Examples) help you learn best practices while checking your code. All processing runs entirely in the browser — your HTML code is never sent to any server. Ideal for web developers, SEO specialists, and accessibility auditors.