There are three ways to add multiple pictures to a PowerPoint 2013 presentation. If you want to allow the viewer to browse through the photos, you can use a photo album. This contains a collection of images which are usually related. You can also place individual pictures on slides. This is useful if you want the images next to text or other items to illustrate your point. Finally, you can use pictures as the background of slides in your presentation. Background images are handy when the photos are not the main focus of the slide, but are intended to accent or enhance the slideshow.
Using a Photo Album
Click the "Images" tab and go to the "Images" group. Click the arrow under "Photo Album." Choose "New Photo Album," or "Edit Photo Album," if you want to add pictures to an existing album. The Photo Album dialog box appears.
Locate the area labeled Insert Picture From, and click "File/Disk" to reveal the Insert New Pictures dialog box. Browse to the picture file that you want to add, and click "Insert." Repeat this step to add additional photos.
Click "Create" to add the chosen photos to a new photo album, or "Update" if you have an existing album. The photo album with the selected photos appears in the PowerPoint presentation.
Using Individual Photos in Slides
View the PowerPoint slide where you want to insert photos. Click the location where you want the first picture, and click "Insert."
Choose "Pictures on My PC." The Insert Picture dialog box appears.
Browse to the computer location of your photos. Select the first photo you want to insert, and click "Insert."
Click on the next location where you want to place a photo within the PowerPoint presentation. Repeat the previous steps to insert additional pictures.
Using Slide Background Images
Click the slide that you want to modify. If you want to apply the same image to multiple slides, hold the "Ctrl" key and click several slides. Select "Design" and choose "Format Background."
View the Format Background area of the dialog box. In the Fill section, click "Picture or Texture Fill."
Click "File" to view the Insert File dialog box. Browse to the location of your photos, and select the image you want to use as a slide background, then click "Insert."
Adjust the background settings to your preferences. Move the "Transparency" slider to make the background more or less clear. Click "Tile Picture As Texture" if you want to tile the image across the background. Adjust the "Offset" settings to change the appearance of the tiled image.
Click a different slide and repeat the previous steps to insert additional background images. You can use one image for every slide background, or have unique images for each different slide.
You can quickly change the order of pictures within a photo album. In the Photo Album dialog box, locate the Pictures in Album list. Click on a picture name, and then click the arrow buttons to move the photo up or down on the list.
You can re-size individual photos on a slide. After you insert a picture, click on it and drag the sizing handles, which are located along the edges of the photo. Hold the "Ctrl" button while you re-size the photo to keep the center of the picture in the same location, or hold the "Shift" key to maintain the proportions of the image.
These steps apply to Microsoft PowerPoint 2013. They may vary slightly or significantly with other versions or products.