Free AI Alt Text Generator

Alt text (alternative text) is a written description of an image that lives in the HTML alt attribute. Screen readers speak it aloud for blind and low-vision visitors, browsers show it when an image fails to load, and search engines and AI assistants read it to understand what the image shows. Good alt text describes the image's content and purpose in one concise sentence.

Aim for one concise sentence, roughly 125 characters or less as a guideline. The old claim that screen readers cut off alt text at 125 characters is a myth, but brevity still matters: listeners can't pause or skim alt text, only restart it. Describe what matters about the image in its context, and skip filler like "image of" or "picture of" since screen readers already announce it as an image.

Yes. Alt text is one of the main signals Google uses to understand images, and it's required for accessibility compliance (WCAG). Descriptive alt text helps images rank in Google Images, strengthens the page's topical relevance, and increasingly helps AI assistants like ChatGPT and Perplexity understand and cite your visual content. It's a light ranking signal on its own, but an easy and worthwhile one.

Yes. You can generate alt text for 3 images per day without creating an account (English). A free account raises that to 10 images per day. Pro ($6/month or $48/year) removes the limits and unlocks alt text and captions in 28 languages, 50-image batches, and URL import with an image SEO audit, all backed by a 14-day money-back guarantee.

Renameit generates alt text and captions in up to 28 languages from a single upload on Pro, including Spanish, French, German, Portuguese, Japanese, and Arabic. Free accounts pick one language; guest users get English. Filenames intentionally stay in clean ASCII, which is the recommended practice for multilingual image SEO: translate alt text, not filenames.

No. Images are sent over an encrypted connection, processed in memory, and permanently deleted immediately after the alt text is generated. They are never stored, shared, or used to train AI models.

Alt text lives in the HTML alt attribute and is read by screen readers and search engines: it describes the image. A caption is visible text shown beside the image for human readers: it adds context. The filename is the file's name on disk and in the URL, and descriptive filenames are another light SEO signal. Renameit can generate all three for every image in one pass.

Vision AI describes what's actually in each image (objects, scene, and context), and you can add keywords to anchor descriptions to your brand or product names. It's accurate for the visual content, but you should still review each suggestion (every one is editable) since the AI can't know context that isn't visible in the pixels.