Image Caption Generator
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AI alt text generator

Upload an image and get accessible, SEO-ready alt text in seconds. Free, no login.

  • Free, no sign-up
  • 5 captions per image
  • Images are never stored
Caption language

Add an image to generate captions.

What this alt text generator does

Upload a photo, screenshot, chart, or product shot and the AI describes what is actually in it, then writes that description the way alt text should be written: short, literal, and free of filler. You get five options so you can pick the one that fits the surrounding context, because the right alt text depends on why the image is on the page.

Nothing is stored. The image is resized in your browser, sent to the model for a single request, and discarded.

What good alt text looks like

  • Keep it under 125 characters: most screen readers truncate past that point
  • Skip "image of" and "photo of": the screen reader already says it is an image
  • Describe function, not just appearance: for a button or icon, say what it does
  • Leave decorative images empty: alt="" tells assistive tech to skip them
  • Do not keyword-stuff: Google treats stuffed alt attributes as spam, and it makes the page worse for the people alt text exists for
  • Include text that appears in the image: if a chart or screenshot contains words, they belong in the description

Why alt text matters

  • Accessibility: WCAG 1.1.1 requires a text alternative for non-decorative images. It is the single most common accessibility failure on the web.
  • Image SEO: Alt text is how Google Images understands a picture, which is how you show up in image search.
  • Broken images: When a file fails to load, the alt text is what the visitor sees instead.
  • Legal exposure: Accessibility lawsuits routinely cite missing alt attributes on e-commerce catalogs.
  • Context for AI: Answer engines reading your page use alt text to interpret the images in it.
Image Caption Generator

How to use it

From photo to alt attribute in five steps.

  1. Upload the image

    Pick a file, or drag it straight onto the box.

  2. Keep the alt text tone

    Leave the tone on Alt text. It is already selected on this page.

  3. Add context if it helps

    A product name, a chart subject, or a location.

  4. Pick the language

    Alt text should match the language of the page it sits on.

  5. Generate and copy

    Copy the option that fits and paste it into your alt attribute.

Need captions instead of alt text? Use the image caption generator, or the Instagram caption generator for social posts.

Frequently asked questions

  • Alt text (alternative text) is a written description of an image in the HTML alt attribute. Screen readers read it aloud to people who cannot see the image, and search engines use it to understand what the image shows.

Doing this at scale

Writing alt text one image at a time is fine for a landing page and painful for a 400-product catalog. RightBlogger runs the same kind of generation without the per-visitor limit, alongside 80+ other content and SEO tools.

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