How do I convert a JPG picture in PDF format?

Method 1: Open the PDF file, select the menu command "file" → "Save As", pop-up Save As dialog box, choose to save the type "JPG", save, as shown below;

Method 2: Open the PDF document, select the command "Save As other" → "image" → "jpeg or JPEG2000", the following figure

Method 3: Open the PDF document and select "Take Snapshots" under the Edit menu (note: When selected, in front of the snapshot will have a √ display), while the mouse into a cross cursor, at this point, drag the mouse box to select the area you want to change, release the mouse, pop-up confirmation dialog box, click OK, the box selected part has been saved to the Clipboard, Then open the system's own drawing tool, paste it and save it as a JPG document.