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 tool in the Image Tools category on BrowseryTools. It runs entirely in your browser — your data is never uploaded to a server, and there's no registration, no ads, and no watermarks, so your privacy is fully preserved.
Frequently asked questions