If you have several images on a slide, you can align your objects both horizontally and vertically for a more professional look. There are guides and gridlines available to help you align objects manually, and there are options to align objects for you automatically. Let’s see how it’s done.
Manually Aligning Objects
In this example, there are three objects on the slide. Point to the first object and drag upward or downward using your mouse. Once the object is centered either horizontally and vertically, a guideline will display.
You can also use guides and gridlines to help you align your objects. From the “View” tab, click “Guides.” Two dotted lines then show up—one aligned to the horizontal center of the slide and one to the vertical center.
Additionally, you can turn on gridlines that can help you align object elsewhere on your slide. From the “View” tab, click “Gridlines.” More dotted lines then display to help you align your objects. You can drag your objects and use the gridlines to align them accordingly.
In this example, we moved each of the three objects upward to align them using the uppermost horizontal gridline:
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Source : How to Use Guidelines to Line Up PowerPoint Objects
