To do slow‑mo on an iPhone, you either record directly in Slo‑Mo from the Camera app or slow a clip down later in the Photos app or an editor like iMovie.

Basic Slo‑Mo While Recording

  • Open the Camera app and swipe along the modes at the bottom until you see Slo‑Mo.
  • Frame your shot, then tap the red Record button to start and tap again to stop; the video is saved as a slow‑motion clip in Photos.

Adjust Slow‑Mo Speed Settings

  • Go to Settings ▸ Camera ▸ Record Slo‑mo to choose your frame rate and resolution (for example, 120 fps or 240 fps; higher fps = slower motion and larger files).
  • Pick a lower resolution if you are low on storage, or a higher frame rate if you want extra‑dramatic slow‑motion.

Edit Where It Goes Slow

  • Open Photos ▸ find your slo‑mo clip ▸ tap Edit in the top‑right.
  • At the bottom, drag the vertical slider lines on the timeline to choose exactly where the video plays in normal speed and where it becomes slow‑mo , then tap Done to save.

Turn a Normal Video Into Slow‑Mo

  • Install and open iMovie from the App Store, then tap Create Project ▸ Movie and select your video.
  • Tap the clip in the timeline, hit the speedometer icon, and drag the slider toward the turtle icon to slow it down, then export/save the new slow‑motion version.

Quick Scoop (SEO Style Extras)

  • Many creators in 2024–2025 use iPhone slo‑mo for short‑form clips like sports, pets, and TikTok transitions, since 120/240 fps is now standard on most recent models.
  • Forum discussions often mention that if built‑in Slo‑Mo feels “too slow,” using an editor lets you pick a gentler slowdown so motion still looks natural.

TL;DR: Use the Camera app’s Slo‑Mo mode to record, adjust start/end of the effect in Photos, or slow any regular clip down with iMovie or similar apps on your iPhone.

Information gathered from public forums or data available on the internet and portrayed here.