Thread:Nkstjoa/@comment-30480843-20181119033344/@comment-5035900-20181119035937

I use Google Slides, so you're in luck. Here's how I do the outlines:

You post the image where you plan to have it in the thumbnail (after using the crop tool to cut them down to just what I need), then click on Format Options. Click where it says Drop Shadow and it'll add one to the image. Now turn the shadow color white (or any other color you desire), turn Transparency and Angle to 0, and Distance to 5 (sometimes smaller depending on the pic).

Now here's the tricky part: you're gonna copy and paste a duplicate of it, place it on top of the original image, but in Format Options, you'll turn the duplicate's Angle to 90. Then copy-paste two more times with the next having 180 and the one after 270. All four together will form an outline across the entire image.

Pro tip: if you look at the image and the outline color and/or size doesn't work for you, you can click and drag outside the images, then release to select all of them at once. From there, you can change all their colors and sizes at once instead of one at a time.

Hope this helps.