FreeAIAlt Text Generator
Write alt text and captions for an image
Alt text, caption, title, keywords and an SEO file name.
Drop an image here, or .
Free AI that runs on your device, no sign-up. Nothing is uploaded. Only edit photos you own or have permission to edit; see our Acceptable Use Policy.
Alt Text Generator: how to use it
- Drop in the image you are about to publish.
- Press Write alt text. An AI model on your device describes the image.
- Copy what you need: alt text, caption, long description, title, keywords, a file name, or the ready-made HTML img tag.
Tips
- Read the alt text before publishing. The model describes what it sees, but only you know why the image is on the page.
- Good alt text is short and says what matters in context: "Red trail running shoe, side view" rather than "image of a shoe".
- If the image contains readable text, it is listed separately so you can include it where it matters.
Alt Text Generator: what it does and when to use it
Alt text is the description screen readers read aloud in place of an image, and what search engines read to understand it. This tool runs Florence-2, a vision-language model from Microsoft released under the MIT licence, inside your browser. It writes a short and a detailed description of the picture and reads any text it can see; the title, keywords and suggested file name are built from those, so they always agree with each other.
The model is large, around 220 MB on a graphics card and 260 MB without one, so the first run takes a while to download; after that it is cached. Because it runs on your device, you can describe unpublished product shots or private images without uploading them.
Treat the output as a first draft. The model describes what it sees, not why the image is on your page, and good alt text depends on that context: the same photo of a laptop needs different alt text in a product listing and in a news story. It can also misread small text or name objects wrongly. Leave alt text empty for purely decorative images, and keep it short for the rest.
Alt Text Generator: frequently asked questions
Is the Alt Text Generator free, and do I need to sign up?
Yes, the Alt Text Generator is 100% free with no sign-up, no login and no account. The Alt Text Generator runs its AI model on your own device, so it has no credits, no daily limit and no upload, and saves at full resolution with no watermark. See why it is free.
How is the alt text written?
Microsoft's open-source Florence-2 model looks at the image in your browser and writes a short and a detailed description, and reads any text in it. The title, keywords and file name are built from those, so they agree with each other. Always read it once: you know what the image is for, the model does not.
How long should alt text be?
Usually one sentence of up to about 125 characters, describing what matters in the image for the page it is on. Skip "image of" at the start: screen readers already announce it as an image. Related tool: EXIF Viewer.
How do I write alt text for an image?
Describe what matters about the image for the page it is on, in one plain sentence, without starting with "image of". This tool writes a first draft with an AI model on your device, plus a caption, title, keywords and a file name. Edit it so it says why the image is there.
Does alt text help SEO?
Yes. Search engines use alt text to understand images, which helps them appear in image search, and it makes the page usable for people with screen readers. Keep it accurate: stuffing keywords into alt text helps neither. Related tool: Image to Text (OCR).