AI Alt-Text Generator
Generate concise, accessible alt text for an image from its URL using a vision model.
🔒 Bring-your-own-key — your key is sent only with this request and never stored. Get a key from Anthropic or OpenAI.
About this tool
Paste a public image URL and get concise, descriptive alt text (under 125 characters) to improve accessibility and SEO. Uses a vision model with your own key.
Frequently asked questions
How does it read the image?
It sends the public image URL to a vision-capable model (Claude or GPT) which describes the image as accessible alt text.
Why does the image need to be a public URL?
The model fetches the image from the URL you provide, so it must be reachable on the public web (not a local file).
Do I need my own API key?
Yes. This tool is bring-your-own-key: paste your own Anthropic or OpenAI key and it is used only for that single request — never stored on our servers.