Image Alt Text Checker
An image alt text checker lists every image in your HTML and its alt text. Paste your page and this free tool shows which images have no alt attribute, which have an empty one, which use the file name as alt text and which images are links with no text at all, so you can fix them one by one.
This tool checks the HTML you paste. It does not visit your page, run your scripts or see your CSS.
Images Flagged for Review:
| # | Source (src) | Alt Status | Alt Text Content | Inside Link? | Review Notes |
|---|
What is a image alt text checker and when should you use it?
Alt text describes an image for people who can't see it, including screen reader users, and for search engines. Google calls alt text the most important attribute for describing an image. When an image is a link, its alt text acts as the link text. Check the links on your page with the Internal Link Counter, review your headings with the Heading Structure Checker, create social preview tags with the Open Graph Generator, or inspect metadata with the Meta Tags Generator.
How do you use it?
- Paste your HTML or upload the file.
- Add the Page URL if your images use relative paths.
- Press Check.
- Fix the images marked to review.
Working on a comprehensive technical audit? Browse all free SEO tools to discover the next step in your workflow, or contact our technical support team if you require a specialized custom utility.
Result interpretation & practical applications
When evaluating the output of the image alt text checker, review the parsed metrics against your specific site architecture. Outputs are formatted for direct implementation into your HTML source, web server configuration, or Google Search Console audit files.
Always inspect generated values for contextual nuance. Automated tools highlight structural patterns, but manual verification confirms that technical directives align with your overarching SEO strategy.
Technical rules and limitations
- Alt text is the most important attribute for image metadata and also improves accessibility.
- Google uses alt text, computer vision and the page content to understand an image.
- Google finds images in the src attribute of img elements, including inside picture.
- When you use picture, include an img element with src as the fallback.
- An image used as a link uses its alt text as anchor text.
These recommendations come from Google's image SEO best practices and the W3C Web Accessibility Images Tutorial.
Common mistakes and troubleshooting
- Leaving alt out altogether.
- Using the file name as alt text.
- Linking an image with no alt and no text.
- Writing the same alt text for every image.
No tool can promise how a search engine will crawl, index, or rank your pages. This tool generates and validates code against documented technical specifications; you determine where to deploy it, and you should always test changes on staging environments first. Google publishes extensive guidelines in Search Central on evaluating third-party SEO tools and advice. Learn more about our technical testing standards on our about us page, or explore full site audits on our pricing page.
Related free tools & workflows
Browse all Advanced On-Page SEO Tools →Technical SEO Audit Workflows
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Authoritative Technical Documentation & Standards
This tool executes logic aligned with official technical documentation and search engine webmaster standards:
- Google Search Central Google Images documentation
Google Search Central: Google Images Best Practices
Primary engineering source and technical documentation.
- W3C Image Alt Text Decision Tree
W3C Web Accessibility Initiative: An alt Decision Tree
Primary engineering source and technical documentation.
Image Alt Text Checker questions
Is an empty alt an error? ↓
No. It is used for purely decorative images. Check that each one really is decorative.
How long should alt text be? ↓
This tool sets no length; describe what the image shows.
Does it load my images? ↓
No. It only reads the HTML.
Is this tool free? ↓
Yes. It is completely free to use and requires no registration or subscription.
Does this tool visit my website or store my files? ↓
No. It executes entirely in your local browser runtime. Your inputs and results are never stored or logged on our servers.
Ready for the next step in your audit?
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