How to Make a Video Slow Motion on iPhone

Slow motion video on iPhone is one of those features that looks impressive but is genuinely straightforward once you understand how the camera system handles it. Whether you're capturing a sports moment, a pet mid-leap, or water splashing, knowing how slow motion actually works on your device — and what affects the final result — makes a real difference in what you get out of it.

How iPhone Slow Motion Works

Your iPhone records slow motion using its Slo-Mo mode, found directly in the Camera app. The key is frame rate. Standard video records at 30 frames per second (fps). Slow motion works by recording at a much higher frame rate — typically 120fps or 240fps — and then playing that footage back at the standard 30fps rate.

The result: one second of real-time action becomes four seconds of playback at 120fps, or eight seconds at 240fps. The camera captures more visual information per second than the eye normally sees, and the playback stretches that out into smooth, detailed slow motion.

Recording Slow Motion in the iPhone Camera App

The process is simple:

1. Open the Camera app
2. Swipe through the shooting modes until you reach Slo-Mo
3. Tap the red record button to start, tap again to stop
4. Open Photos, find your clip, and play it back — the slow motion section plays automatically

By default, only part of your clip plays in slow motion. You can adjust which section slows down by editing the clip directly in the Photos app. There are two vertical bars beneath the frame viewer — drag them inward or outward to define exactly where slow motion begins and ends. Everything outside those markers plays at normal speed.

Changing the Slow Motion Frame Rate and Resolution

You can control whether your iPhone records at 120fps or 240fps through the Settings app:

1. Go to Settings → Camera → Record Slo-Mo
2. Choose your preferred option (available choices vary by model)

Higher frame rates (240fps) produce smoother, more dramatic slow motion, but the tradeoff is lower resolution. On most iPhones, 240fps Slo-Mo records at 1080p, while some models cap it lower depending on hardware. At 120fps, you typically get more flexibility in resolution.

This is where your specific iPhone model starts to matter.

How iPhone Model Affects Slow Motion Capability 📱

Not every iPhone offers the same slow motion options. The capabilities have expanded significantly across generations:

The front-facing camera is a separate consideration. Selfie slow motion ("Slofies") became available starting with the iPhone 11, but the front camera generally records Slo-Mo at lower frame rates than the rear camera.

Editing Slow Motion After Recording

The Photos app gives you meaningful control over your slow motion clips without needing any third-party software:

• Trim the clip using the yellow handles in the timeline
• Adjust the slow motion window using the frame rate markers (the two bars in the scrubber)
• Export or share the clip as-is directly to Messages, social media, or AirDrop

One thing worth knowing: when you share a Slo-Mo clip, how it plays back on the receiving end depends on the platform. Instagram, for example, may flatten the slow motion effect depending on how you post it. If preserving the effect matters, exporting the clip as a video file first gives you more control.

Converting Existing Videos to Slow Motion

The native Camera and Photos apps cannot convert a regular 30fps video into slow motion after the fact. Stretching out standard footage just makes it choppy. True slow motion requires that the footage was captured at a high frame rate to begin with.

If you have a normal video you want to slow down, you'll need a third-party app. Several video editing apps on the App Store can artificially slow down standard footage using frame interpolation — a process where the app generates new frames between existing ones to simulate smooth slow motion. The quality of this effect varies considerably depending on the app and the nature of the footage. ⚠️

Factors That Shape Your Results

Understanding slow motion on iPhone is one thing. How well it works for your specific situation depends on several variables:

• Your iPhone model — determines whether 240fps is available and at what resolution
• iOS version — Apple periodically updates Camera app capabilities; staying current matters
• Lighting conditions — slow motion requires good light because the shutter is moving very fast to capture all those frames; low light produces noticeably grainier results
• Subject movement — highly chaotic or unpredictable motion can be harder to frame well before recording starts
• Storage space — Slo-Mo files are significantly larger than standard video files; 240fps clips at 1080p fill storage quickly
• Intended platform — where you plan to share or use the video affects which format and resolution makes sense

What the Settings Menu Doesn't Tell You

The Settings app shows your options, but it doesn't tell you which choice is right for what you're trying to do. A 240fps clip of a hummingbird in bright sunlight will look extraordinary. The same setting used indoors with artificial lighting on a slower-moving subject may look soft and grainy — and 120fps with better exposure might produce a cleaner result. 🎬

The technical capability your iPhone offers and the right configuration for a specific shot are two different things. Most users settle on one default setting and leave it there, but photographers and videographers often switch between modes depending on the scene, the light, and what the final product needs to be.

Where your own use case sits on that spectrum — casual moments, professional-quality clips, social sharing, or cinematic editing — is what ultimately determines which combination of settings and tools will give you the results you're looking for.