Mac Finder has a little-known trick up its sleeve called Quick Look. This lets you quickly preview the contents of a file without opening the file itself.
Quick Look is easy to use, and it works with documents, images, folders and more. Simply highlight the file and tap the Spacebar on your keyboard. The result is an easy to read, scrollable preview of the document’s contents.
You can then open it in its parent application, or share it via AirDrop, email, messages and more.
Quick Look multiple files
You can highlight a number of files (open a folder and press Cmd + A to select all the files, for example) and then tap Option + Spacebar to conjure up a preview slideshow of all the documents.
Flick through them with the arrow keys. Click the Index button, and you’ll see a thumbnail gallery of all the files. Click the one you want to preview, and then press Esc to go back to Finder.