If you already have images in other formats (like JPG), you can convert them to PNG simultaneously:
: Use a batch renaming tool (like PowerRename on Windows) to give the 200 files descriptive names (e.g., Step_01.png , Icon_Help.png ).
: Set the extension to only detect .png files to avoid downloading unnecessary banners or ads.
: Sites like Vecteezy and Pngtree offer extensive galleries of transparent PNGs including icons, illustrations, and user guide elements.