How to combine photos for free on iPhone?

I want to combine photos like a meme. I use ifunny and want to post something on it that requires photo combination. I don't know how to do it! It's like when they put one picture and then a picture directly under it. Not a rage comic. Is there like an app for it? Preferably free?

Download a collage app.

I use an app called pic stitch. I use it for things of that sort all the time!

Panorama might be what you're looking for. And it's free!