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Image Alt Text Checker

Check image alt text from HTML. Find missing alt attributes, empty alt text, long alt text, duplicate alt text, file-name-like alt text, lazy loading, dimensions, and image SEO issues.

Paste HTML with image tags, copied template markup, or one image URL per line when using image list mode.

Options

Checks missing alt attributes, empty alt text, duplicate alt text, long alt text, file-name-like alt text, dimensions, and loading attributes.

Output

Image alt text output will appear here.
Image alt text analysis happens directly in your browser. Your HTML is not uploaded to a server.

Checking Image Alt Text for SEO and Accessibility

Image alt text helps screen readers describe meaningful images and gives search engines more context about image content. Missing or unclear alt text can make a page harder to understand, especially when images support the main content.

This Image Alt Text Checker scans pasted HTML and reports missing alt attributes, empty alt text, duplicate alt text, long alt text, file-name-like alt text, missing image dimensions, and lazy loading notes.

Reviewing Image Alt Attributes

  1. Paste HTML from a page, template, CMS editor, or copied source.
  2. Choose HTML input or image URL list input.
  3. Set checking style and optional warnings.
  4. Run the checker and review each image result.
  5. Fix missing, unclear, duplicated, or file-name-like alt text.

Common Image Alt Text Checker Use Cases

  • Finding images with missing alt attributes before publishing.
  • Checking whether meaningful images have descriptive alt text.
  • Finding alt text that only repeats the image file name.
  • Reviewing product, blog, documentation, and landing page images.
  • Checking image dimensions and loading attributes in templates.
  • Preparing cleaner HTML for SEO and accessibility reviews.

Example Image Markup

<img
  src="/images/json-formatter-preview.png"
  alt="JSON formatter interface showing formatted JSON output"
  width="1200"
  height="630"
  loading="lazy"
/>

Empty Alt Text Can Be Correct

Not every image needs descriptive alt text. Decorative icons, dividers, and purely visual flourishes can use empty alt text so screen readers do not announce unnecessary content.

The goal is not to fill every alt attribute with keywords. The goal is to describe meaningful images naturally and leave decorative images quiet when appropriate.

Frequently Asked Questions

What does an Image Alt Text Checker do?

It scans image tags and reports missing alt attributes, empty alt text, duplicate alt text, long alt text, and other image markup issues.

Should every image have alt text?

Every image should have an alt attribute, but decorative images can use an empty alt value.

Is alt text important for SEO?

Helpful alt text can improve image understanding and accessibility. It should describe the image naturally, not stuff keywords.

Can this check image URLs only?

Yes. Use image URL list mode to review image sources, though HTML mode gives better alt attribute details.

Is my HTML uploaded anywhere?

No. The checker runs directly in your browser.