Method 2: ConvertIt for $.99
Preview is a fantastic way to convert graphic formats, but there is even a faster way with a $.99 app from the Mac App Store called ConvertIt. ConvertIt allows you to convert to png, jpeg, tiff, pdf, gif, icns, bmp, and ico formats. In the ConvertIt preferences you can choose which of the options you want available when you convert your file. When you convert a file you even see the options you didn’t choose except they are dimmed out.
To find the preferences you go to the ConvertIt menu in the menubar (it looks like a little gear with a “C" in it). Choose preferences and you can make your changes. Why limit your options if they are visible anyway? I’m not sure, but that is up to you. My favorite preference settings allows you to only have the menubar icon visible and it hides the dock icon. I really love it when developers do this.
To convert the file you simply drag and drop the file to the menubar icon or the dock icon. Release the button when you see a ~ez_ldquo+ez_rdquo~ sign. A window showing the conversion formats will appear, choose the format you want to convert the file to and off you go. If you set it for specific formats only, then only those formats will be allowed. The file will then be saved to the default location which can be set in the same Preference window that you set the conversion options.
I have set ConvertIt to open automatically every time I restart the computer. This way it is always available to me as I tend to convert a lot of files.