How to record the front and back camera at the same time on an iPhone
Short answer: you need an app built on multi-camera capture, because Apple’s own Camera app does not offer it. Modern iPhones can genuinely run the front and back cameras at once — it is a documented capability of the capture hardware — but the system camera exposes only one camera at a time. A dual-camera app opens both streams, draws them into a single frame, and writes that frame to a video file while you shoot.
The important consequence is that you end up with one finished video, not two clips to align later. That is the whole reason people search for this: reaction shots, vlogs where you narrate what you are pointing at, and interviews where both faces matter are painful to reconstruct in an editor and trivial to capture in one take.
Why the built-in Camera app cannot do it
iOS has two separate concepts here. A normal capture session runs exactly one camera and can switch between them; a multi-camera session runs several inputs concurrently. The second one is what dual recording needs, and Apple has never wired it into the stock Camera app. So no setting, no toggle, no hidden gesture will turn it on — it is not a feature that has been hidden from you, it simply is not there.
A multi-camera session also comes with rules a normal session does not have. Every camera in the session must be running a format that explicitly supports multi-cam, the combined load of all the inputs has to stay inside a hardware budget, and the session cannot use the convenience presets like “high” or “4K”. This is why a dual recording is never simply “two normal recordings at once”, and why the resolution ceiling is lower than what one camera alone could do.
What you get out of it: one composited file
There are two ways an app could handle this. It could record two separate video tracks and let you arrange them afterwards, or it could composite both camera images into a single canvas in real time and record that canvas. The second approach is what makes the result immediately postable.
DualCam takes the second route. The two camera images are drawn into one frame on the GPU, and the exact frame you are looking at in the viewfinder is the frame written to the file. Nothing is re-rendered afterwards, so the preview is not an approximation of the result — it is the result. The canvas is 1080 pixels wide, either 1080×1920 for standard 9:16 or 1080×2340 to fill a modern iPhone screen edge to edge.
Setting up a dual recording that is actually usable
Decide the layout before you press record
Picture-in-picture keeps one camera full-frame with the other floating in a corner, and it is the right default for anything where one side is clearly the subject. Split screen gives both halves equal space and suits conversations, comparisons and interviews. You can change layout mid-take in DualCam, but it is still worth deciding, because the framing you need is different.
Frame for the crop
This is the mistake that ruins otherwise good dual footage. A phone camera frame is 16:9 in landscape; a vertical canvas is much narrower. When a camera image is fitted into a half of a split screen, the app has to crop — and in a left/right split on a vertical canvas, roughly a quarter of the frame disappears off each side. Centre faces and keep anything important away from the edges.
Set the things that lock once recording starts
In DualCam, resolution, the mute switch and the countdown timer are fixed the moment recording begins, because they change how the output file is constructed. Layout, the picture-in-picture corner, its size and shape, and the colour filter can all be changed while the camera is rolling. Decide the first group in advance; play with the second group freely.
Give it room and give it air
Two cameras plus a hardware encoder is a genuinely heavy workload. Start with real free storage available, take the phone out of a thick case if you are shooting long, and do not start a twenty-minute take on a phone that is already hot from charging in the sun. See the guide on why dual recording stops for the specific thresholds.
A note on “recording” with a screen recorder instead
A common workaround is to open a dual-camera preview and use the iOS screen recorder to capture it. It works, in the sense that you get a file, but the result carries whatever the screen was doing — status bar, UI chrome, notifications — and the encoder is optimised for screen content rather than camera footage. If you plan to post the video, a real dual-camera recorder that writes a clean canvas is strictly better. Use screen recording only as a last resort on a device that cannot do multi-cam at all.
Common follow-up questions
Do I get one video file or two?
With DualCam, one. A single MP4 with both cameras already laid out, ready to post. Other apps may choose to keep the streams separate; that is an app design decision, not a hardware limit.
Can I swap which camera is the big one?
Yes. Which camera fills the frame and which one is the inset can be swapped, and in DualCam that swap works mid-recording along with the rest of the layout controls.
Does it work in landscape?
DualCam is portrait only. The canvas is vertical by design, which is also what every short-video platform wants.
Want to just do this?
DualCam records the iPhone front and back cameras at the same time and writes one finished MP4 while you shoot. Free, no account, no ads, nothing leaves the phone.