Image2Prompt works out the prompt behind a picture. You upload any image and the tool describes its subject, style, colours and mood in a detailed prompt that you can edit and reuse in an image generator such as Nano Banana or DALL-E.
Its recognition looks at several aspects of the image, and a text-to-prompt mode helps expand a short idea into a fuller description. You need to sign in to upload images, and sample pictures are available if you just want to see how it works.