What you see is what you get
Meaning: 1) There is nothing hidden. What you are looking at is the real thing. 2) In computing, the way something displays on the screen is the way it will display in print (or other media) -- hence the acronym WYSIWYG.Origin: Although the acronym WYSIWYG originated with computing, the actual saying "What you see is what you get" predates computing, being used for example by salesmen to assure customers of the quality of their product.
Variety: This is typically used in American English but may be used in other varieties of English too.