A PNG keeps the transparency a PSD has
A PSD is a stack of layers and a PNG is one picture, so converting means flattening the stack. Here the layers are drawn on a transparent canvas, so whatever is see-through in your PSD stays see-through in the PNG: logos, cut-outs and stickers drop straight onto a web page or a slide. Or skip the flattening and take every layer as a PNG of its own.
- One transparent PNG of the whole image
- Every layer as a PNG, full canvas size or trimmed to the visible pixels
- Scale to 50% or 25%, or cap the longest side at 4096, 2048 or 1024 px