WCAG Alt Text Checker for Screen Readers
Free AI alt text written for screen-reader users. Upload a photo and get a WCAG-oriented description with the details a blind or low-vision user needs. No signup.
Drag and drop, upload, or take a photo
JPG, PNG, WebP, AVIF, and HEIC. HEIC is decoded on your device.
What screen-reader alt text needs to cover
Screen-reader alt text answers one question: what does a person who cannot see this image need to know to understand the page? Name the people and the action, read out any text the image shows, and skip details that do not change what the image communicates.
Upload a photo, keep Accessibility mode selected, and the tool returns alt text built around context. SEO mode stays under 125 characters. Accessibility mode can run longer when a screen-reader user needs more. An image that needs three sentences gets three sentences.
How to get a better result
Upload the actual image your page will use, not a placeholder or a cropped preview. If the image includes text (a screenshot, a sign, a product label), the tool reads it and includes it. If the image is functional, such as a button icon or a linked thumbnail, describe what happens when a user activates it.
Limits and related modes
This page does not certify WCAG conformance. Review the output with a human accessibility check before you publish. For a quick check on whether an image should use empty alt text, open Decorative check mode on the main Alt Text Generator. For keyword-focused alt text, use SEO mode on the same page.
How to Use
- 1Upload the image you need alt text for
- 2Pick SEO, accessibility, social, or decorative mode
- 3Generate alt text with AI
- 4Copy the format you need (plain, HTML, or Markdown)
When to Use Each Mode
SEO
Blog heroes and product thumbnails that should rank for visual queriesAccessibility
Any informative image that screen-reader users need describedSocial
Captions for Instagram, LinkedIn, or X when auto-captions are weakFrequently Asked Questions
What does WCAG-oriented alt text include?
It covers what a blind or low-vision user needs to understand the image in context: the people, the action, any text shown in the image, and the details that change meaning. It focuses on meaning, not a pixel-by-pixel caption.
How is this different from SEO alt text?
SEO mode targets keywords and stays under 125 characters. Accessibility mode drops the character limit when the image needs more context, and it does not add keywords the image does not show.
Does this replace a manual accessibility audit?
No. Treat it as a fast first draft. It is not a WCAG conformance certification. Review the output before you publish, especially for images that trigger an action (buttons, links) or carry information a caption alone will not cover.
When should alt text be empty?
Purely decorative images (borders, spacers, background flourishes) should use alt="" so screen readers skip them. Use Decorative check mode on the main Alt Text Generator to test a specific image.
Does it handle screenshots and images with text in them?
Yes. The prompt asks for any text shown in the image, so a screenshot of a form or a photo of a sign includes that text along with the layout description.
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