AI Alt Text Generator
Write good alt text in seconds. Drop in an image and an AI captioning model (ViT-GPT2) describes it, then this tool polishes the description into accessible, SEO-friendly alt text: it drops redundant 'image of' phrasing, capitalizes it, trims it to a screen-reader-friendly length, and gives you a ready-to-paste HTML img tag. The model runs entirely in your browser, so nothing is uploaded. It downloads once on first use, then is cached.
How to generate alt text for an image
- Drop an image in, or click to browse.
- Wait a few seconds while the AI describes what it sees.
- Edit the suggested alt text if you like, then copy it or the HTML img tag.
Examples
Photo to alt text
A photo of a dog running on a beach
alt="A dog running on a beach"
Frequently asked questions
Is my image uploaded anywhere?
No. The AI captioning model runs entirely in your browser with WebAssembly. The image is processed on your device and never uploaded. Only the model itself is downloaded, once.
What makes good alt text?
Describe what the image shows and why it matters in context, keep it concise (around 125 characters or less), and do not start with 'image of' or 'picture of' because a screen reader already announces it as an image. This tool applies those rules automatically, and you can always edit the result.
Should I always add alt text?
Add descriptive alt text to images that carry meaning. For purely decorative images, use an empty alt (alt="") so screen readers skip them. This tool offers a one-click decorative option for exactly that case.
Does alt text help SEO?
Yes. Alt text helps search engines understand your images, which can improve image search rankings, and it is essential for accessibility. Accurate, specific descriptions help both.
Why does the first run take a moment?
The AI model downloads the first time you use the tool, then is cached for instant reuse. Larger images also take a little longer to caption.
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