Is there some special or secret way to get a "new document" in Preview on Mac? I am trying to compare Google Docs's Drawings with Mac's Preview, and if I can have a canvas, such as a white one with 1200 x 800 pixel, then I can start drawing rounded rectangles, lines, and text.

However, there is no way to get a new blank document of 1200 x 800 pixel wide to begin drawing. Somehow it seems I have to find such an image, make a "copy" (the copy in copy-and-paste), and then "Paste from Clipboard".

Is there some special or secret method or good method to create such a new document to draw on?
This is exactly what a document template on macOS is intended to do. You make one document then flag it. Next time you open it (from automation, script, recents, finder) it creates a new empty document with precisely the setup you want.


https://support.apple.com/guide/mac-help/create-document-templates-on-mac-mchlp1341/mac


Even though Apple documents this clearly and plainly, I suspect most people find it a “secret trick” or hidden gem once they have an itch like yours that needs scratching.