Isolate the main subject and place it on a fully transparent background. A precise edge all the way round, including individual strands of hair, fine detail and any semi-transparent areas, which should keep their partial transparency rather than being cut hard. No residual fringing or colour halo from the original background. Do not alter, relight or recolour the subject in any way — only remove what is behind it.
“Use it” opens the editor with this prompt already loaded — add your photo and generate. Copy works anywhere else: ChatGPT, Gemini, Midjourney.
Hair edges are where cut-outs fail. Check them at 200% before you use the file.