How to Put Two Videos Side by Side on iPhone

The fastest way to put two videos side by side on iPhone is to add the second clip as an overlay in iMovie and choose Split Screen. Here's the full workflow, plus how to pick between the overlay styles iMovie actually offers.

Put two videos side by side on iPhone with iMovie

Start from the clip that carries the audio. That's your main shot, and it stays as the base layer of the project. Add the second clip as an overlay: iMovie on iPhone gives you Cutaway, Picture in Picture, Split Screen and Green/Blue Screen to choose from, applied from the same overlay menu once the second clip is positioned above the first on the timeline.

Side by side, picture in picture, or cutaway?

These four do different jobs, and picking on autopilot usually means picking wrong. Split Screen puts two clips next to each other as equals. The layout for a genuine side-by-side, and the right choice when both sources matter equally, like a reaction video where the original clip needs to stay fully visible. Picture in Picture overlays a small window on the main shot instead, better when one clip is reacting to or commenting on the other rather than sharing the frame equally. Cutaway briefly replaces the main shot rather than showing both at once, so it isn't really a side-by-side option at all, despite getting lumped in with the others. It's closer to a cut than an overlay. Green/Blue Screen keys out a solid-color background from the second clip instead of showing its frame as a rectangle, which only works if that footage was actually shot against green or blue.

Two clips of different lengths also raise a question none of the four overlay styles answer on their own: what happens when the shorter one ends. Deciding that upfront , hold the last frame, cut back to the main clip, or trim the longer one to match , avoids a layout that looks intentional for ten seconds and then falls apart.

B-roll layers with split-screen on a real timeline

Montaj supports B-roll layers with split-screen on a real timeline, so you can place a second clip alongside the main one exactly where you want it, by hand, with its own in and out points independent of the main clip's length. Worth knowing before you start: in a vertical 9:16 frame, two clips "side by side" usually end up stacked one above the other instead, since each half loses width once the frame gets tall. A layout that reads completely differently from the same idea in landscape. Once you've put two videos side by side on iPhone this way, that's the layout you're actually working with.