AI Image Describer & Captioner
Get an accurate, detailed caption for any image — for alt text, prompts, or search.
Open the tool →Free · No account · No upload · Open source
100% in your browser
Private — no upload
No watermark
Free & open source
How it works
- Add an image.
- Run the Describe Image node — a local vision model (Florence-2 / ViT-GPT2) writes a caption.
- Copy the text, or wire it straight into a prompt for image generation.
Why Nano Editor
- Private by design. The AI runs on your device with WebGPU — your images never leave your computer.
- Actually free. No account, no subscription, no watermark, no per-image cost.
- Part of a full studio. This tool is one node in a visual, node-based image editor — chain it with background removal, upscaling, generation and more.
- Open source. MIT-licensed on GitHub.
FAQ
What can I use the caption for?
Accessibility alt text, image search/cataloguing, or as a starting prompt for AI image generation.
Does it work offline?
After the model downloads once, yes — it runs fully in your browser.
Is it free?
Yes, with no account and no per-image cost.