Add an image gallery in Keynote on Mac
With an image gallery, you can view a collection of photos in one place on a slide, so only one shows at a time. When you play your presentation, you can cycle through the images before moving to the next slide. A visual effect plays during the transition from one image to the next.
Click
in the toolbar, then choose Image Gallery.Drag the image gallery to reposition it on the slide, and drag any selection handle to resize it.
To add images, drag them from your computer to the image gallery.
To customise the image gallery, make sure it’s still selected, then do any of the following:
Adjust the position or zoom level of an image: Double-click the image on the slide, then drag it to move it in the frame. Drag the slider to zoom.
Reorder images: In the Format
sidebar, click the Gallery tab, then drag image thumbnails to reorder them.Add an image caption: Double-click the text box below the image on the slide, then enter your text. To use the same caption for all images, in the Format
sidebar, click the Gallery tab, then select “Same caption for all images”. Double-click the text box below any image and enter your text.Hide captions: Deselect Caption.
Change the transition between images: To change the visual effect that plays between images in your presentation, in the Animate
sidebar, click the Action tab, then click Change.Add an image description that can be used by assistive technology (for example, VoiceOver): Click the Gallery tab in the Format
sidebar, then click an image thumbnail. Enter your text in the Image Description text box. The image description isn’t visible anywhere in your presentation.
To navigate through the image gallery, click
or 
.
To remove an image from the gallery, in the Format sidebar, click the Gallery tab, click the image thumbnail, then press Delete.