Image Caption (Alt Text)
Add accurate alt text to a whole folder of images for accessibility and image SEO, without writing each one by hand.
- Files never leave your device
- 100% free
- No sign-up
- No watermark
- AI runs on your device
or drag & drop pictures here — or paste with Ctrl+V
How to generate captions for images
- Select, drop or paste one or more pictures.
- Tick what to write: alt text, a description, a detailed description and/or the text in the picture.
- Click Describe pictures, edit the results, and download them — or get the pictures renamed after their captions.
About Image Caption
Let AI describe your pictures. Get a short caption that works as alt text, a full description of what is in the picture, and the text written in it — for one picture or a whole folder, without uploading anything.
Edit the results, copy them, or download them as a text file, a CSV for spreadsheets, JSON, or ready-made HTML img tags with alt text. You can also download your pictures renamed with descriptive, search-friendly file names.
Good for
- Alt text for websites, blogs and online shops
- Descriptions for social media posts and catalogues
- Search-friendly file names for photo libraries
Tip: Read the alt text once — add names, brands or places the AI cannot know.
Frequently asked questions
What can it write?
A short caption that works as alt text, a description, a longer detailed description, and any text that appears in the picture.
Is it good for SEO and accessibility?
Yes. Use the short caption as alt text for screen readers and search engines, download ready-made img tags, or rename your pictures with descriptive file names.
Which languages are supported?
Captions are written in English.
Why is the first run slow?
The AI model (Florence-2, about 210 MB) is downloaded once and kept in your browser. Each picture then takes a few seconds to a minute, depending on your device.
Are my pictures uploaded to a server?
No. The AI runs in your browser on your own device. Only the AI model itself is downloaded the first time; your pictures never leave your device.