Paste Your HTML Content
Copy and paste your webpage HTML code into our alt text checker. The tool automatically scans every img tag and identifies which images have missing or empty alt attributes.
Alt Text Checker
Paste your HTML code and instantly find all images that are missing alt text or have empty alt attributes. The checker scans img tags and reports which ones need accessibility improvements. Essential for WCAG compliance and SEO.
Workspace
Use the tool below. Your inputs stay local when the tool supports browser-only processing.
WCAG Compliance: WCAG 2.1 Success Criterion 1.1.1 (Non-text Content, Level A) requires all
<img> elements to have meaningful alternative text. Decorative images should use either alt="" withrole="presentation" oraria-hidden="true".Workflow
How to use the Alt Text Checker
Review Missing Alt Text Report
View a detailed analysis showing each image's current alt text status. The alt text checker clearly categorizes images with missing descriptions, empty attributes, and properly described alternatives for easy action.
Fix and Export Updated HTML
Click on suggestions to add descriptive alt text for images that are missing descriptions. Export the updated HTML with all alt text issues resolved, ready to deploy to your website for improved accessibility and SEO.
Alt Text Checker — Frequently Asked Questions
Why should I use an alt text checker for my website?
An alt text checker helps you identify images missing descriptive attributes that are critical for both accessibility and SEO. Screen readers rely on alt text for visually impaired users, while search engines use it to understand and rank image content.
How often should I run an alt text checker on my site?
Run an alt text checker after every content update or site redesign that adds new images. Regular scanning ensures your site maintains WCAG compliance and that all images contribute properly to your overall SEO strategy.