Image Captioner & Alt Text Generator
Turn any image into a descriptive caption and ready-to-use alt text — on your device, no upload.
Drop an image here
PNG, JPG, WebP, GIF or BMP. Processed locally.
Runs a small image-to-text AI model entirely in your browser. The model downloads once from a CDN on first use, then generates captions on-device — your image is never uploaded.
About Image Captioner
Generate a descriptive caption and ready-to-use alt text for any image with an on-device AI model. Great for accessibility and SEO. Free, private, no upload.
Image Captioner is a free image tool on AllYour.Tools, built for fast everyday use directly in your web browser. It is designed for people searching for Image Captioner online, a free Image Captioner tool, or a private browser-based alternative that works without installing extra software.
The tool runs locally in your browser whenever possible, so your files, text, and settings stay on your device instead of being uploaded for server-side processing. That makes it useful for quick personal tasks, developer and creator workflows, and privacy-sensitive work where speed and control matter.
How to use Image Captioner
- Open Image Captioner in your browser.
- Add the text, file, or settings the tool asks for.
- Review the result on the page and adjust the options if needed.
- Copy, download, or use the result in your workflow.