This will open the document in Preview. Click in the Preview window to open the file in Preview, and then click to open. If the Preview window does not open in your current window, make sure you have the default document font, font size, and view options. Step 2. Format and Color Preview the document Before formatting or editing PDFs, Preview has to be first converted back into an image, because these tools will be applying a different formatting to a PDF file than that which is applied to a document printed or scanned from a laser printer. You can do both at once by opening the Preview window through both windows. Click Preview (in the toolbar) in the Preview window, and then press F3 to open the Format dialog in the window that is open now. How to Convert a PDF to Images on Mac — CST IT Formatting PDFs in Preview on Mac From the Preview dialog, select the format you would like Preview to use, and then press the Format button. Or, if you want to edit the style of a PDF, select the same options (using the Format button) then press the Edit button in the toolbar. The following table describes the available options. Preview Font The font used in the PDF, as well as the styles available for your PDF. These will also vary depending on the content of the PDF you are editing. Preview Layout The layout of the PDF in terms of page size and indentation. You can also use this setting to automatically align all pages and indent your PDF. Preview Page Style The page design mode used in the PDF. The table lists the page styles available for your PDF. The available page styles use the font, default alignment, default style color, default line thickness, and default margins. If you select another page type, they will be automatically chosen. If you select an image, Preview will use the size of the image as its default page size. If you use Preview to edit a PDF file, you do not have to close the document as often as you otherwise would; but you can, of course, use the preview to make sure that all options and content were preserved. What Is a PDF Document? When you choose a PDF file for formatting or editing, you are not actually taking a single document and opening it in Preview; you are creating a new document.