Audit Image Alt Tags Online for Free

The Alt Tag Checker scans your web page to identify images that are missing descriptive alt attributes — essential for search engine image rankings and web accessibility compliance (WCAG). It helps you ensure every image contributes to your overall SEO strategy. This tool is free, secure, and processes all scans locally in your browser.

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   Paste your page HTML into the input area.

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   All images are listed with their src and alt values — missing alts are highlighted.

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   Fix each flagged image by adding descriptive alt text in your source HTML.

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   Enter the URL of the page you want to audit.

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   Click Check Alt Tags to scan for missing or empty image attributes.

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   Review the list of images to identify which ones need optimization.

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   Why are alt tags important for SEO?

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   Alt tags help search engines understand the content of an image, allowing it to appear in Google Image search results and improve overall page relevance.