A PDF is a kind of document that's easy to open on all sorts of platforms. It's good to use if you don't want someone else editing the document or when you don't want the look of the document to change, like when sharing your CV.
Drop a file anywhere on the page or click the button above
A PNG is a kind of picture that's mostly used for icons and logos. PNGs aren't the smallest, but they let you have transparency in a picture and they're very good quality – no details are ever lost in a PNG.