With Quick Look available for OS X you are able to view the contents of a file by selecting it in Finder and after that pressing the spacebar. What this means is that you do not have to wait for the file to open in a suitable app as it will appear right away.
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Once you have selected a file in Finder and viewed it with the help of Quick Look, you’re now able to view other files that are located in the same folder very fast. How? By pressing the arrow keys so if you are in either Column of List View, you just have to press on the up and down arrows in order to view other files. If in Icon View, you can still use the up and down arrow keys but most likely you’ll also have to use the left and right ones for seeing the items in other columns.
After opening a file that has multiple pages with Quick Look, you’re able to scroll through the entire file to see all of the content. Let’s take for example a regular PDF file. If you press the spacebar you’ll notice the first page appearing along with the other page’s thumbnails which are found to the sidebar located on the right. For reading these pages you can use the trackpad or the mouse for clicking on them. For moving through them you must use the Page Up and Page Down buttons. This will also work with the documents that have been created with Numbers, Word, Excel, PowerPoint, Keynote, and others as well. If you’ve received an e-mail that has an attachment in your Mail, you have the possibility to click the Quick Look button found on the message’s top-right so that you can see it. If that e-mail has more than just one attachment, arrows are going to appear at the top left of Quick Look’s windows. By clicking on one of these arrows you will see the previous or next attachment. Also there is a button called Open With Application Name which we’ll allow you to select to open that file which you are looking at in its appropriate app. If you have moved some of your files to Trash but you are not certain if you have made the right decision, Mac’s OS X doesn’t allow you to open the files in Trash but the good news is that you’re able to select those files and then press the spacebar in order to view their content with the help of Quick Look.
If you enjoy using Spotlight in order to search for the files stored on the hard drive on your Mac, you should know that there is a way for accessing a form of a Quick Look option when you are browsing the results. What you have to do is hover the mouse cursor over a result so that you can see the content of that file. You can hover over a web page to see how it looks like, or you can hover over a music or video file and then move the mouse cursor over the display and then select the arrow button for playing the audio/video file. Similarly, hover on a document written in Word to see its content.