How to Edit a Video to Slow Motion | Methods That Deliver

Editing a video to slow motion comes down to lowering clip playback speed or using high-frame-rate footage for the smoothest result.

Stretch a 30 fps clip to half speed and the motion stutters. Stretch a 60 fps clip the same amount and it glides. That difference — the source frame rate — is the single factor that decides whether how to edit a video to slow motion produces buttery results or a frame-by-frame slideshow. The method itself is straightforward, but the footage you start with changes everything.

Editing a Video to Slow Motion: Frame Rate Decides Your Result

A video can only look as smooth in slow motion as its captured frames allow. When you slow a clip, the editor stretches existing frames across a longer timeline — if there aren’t enough frames per second to begin with, the gaps become visible as stutter.

Here is the key relationship. A 60 fps clip played back on a 24 fps timeline can be slowed to 40 percent of its original speed while maintaining smooth motion. A 120 fps clip on that same timeline reaches 20 percent. Regular 24 or 30 fps footage starts showing choppiness well before those numbers. The higher the capture frame rate, the more room you have to slow down cleanly.

The Quickest Method — Adobe Express

Adobe Express offers the simplest way to make a video slow motion entirely in a web browser with no installation required. Upload a video, choose a slower speed, mute the audio if the pitch shift bothers you, and download the result. The tool accepts videos up to one hour long. When the download completes, the clip plays back at your chosen slower rate — that is your success cue that it worked.

The trade-off is limited control. Express offers preset speed reductions rather than exact percentages or keyframe ramps, but for a fast, clean result on any device, it delivers. Adobe’s slow motion tool requires no account for basic use and works on any device with a browser.

Editing Slow Motion in Premiere Pro

Premiere Pro gives editors the deepest set of slow-motion controls — Interpret Footage, Speed/Duration, the Rate Stretch Tool, and Time Remapping with keyframe ramps. The cleanest method for whole-clip slow motion is right-clicking the clip, choosing Modify > Interpret Footage, and under Frame Rate selecting Assume this Frame Rate to reinterpret the footage at your target speed. Another is right-clicking the clip and using Speed/Duration to set a percentage directly. The clip plays back at the new speed once you preview — that confirms the edit took effect.

Speed ramping — changing speed within a single clip — uses Time Remapping > Speed. Add keyframes at the transition points, drag the speed line between them, and expand the keyframe handles for easing. The Rate Stretch Tool lets you click and drag a clip edge to make it longer or shorter while Premiere automatically calculates the speed percentage.

Making a Video Slow Motion on a Phone

CapCut and the built-in Samsung Gallery editor both offer one-tap slow motion on a mobile device. In CapCut, import the video, select the clip, open the Speed control, and drag the slider down to your target rate — 0.5x for half speed. Preview the clip to check the motion, then export. The Samsung Gallery editor follows a similar path: tap Edit, then Speed, choose half speed, and save. The saved video plays back at the reduced speed, confirming the edit.

iPhone users can capture slo-mo directly in the Camera app’s Slo-Mo mode, but converting existing normal-speed video requires a third-party editor like CapCut or iMovie. The same basic workflow — import, select, adjust speed, export — applies across all mobile editors.

Slow Motion Methods Compared

What Frame Rate Gives You the Smoothest Slow Motion?

The answer depends on your delivery timeline. For a 24 fps timeline — the standard for cinema and most web video — 60 fps footage allows a 40 percent slow, and 120 fps allows 20 percent. Each doubling of the capture frame rate doubles the smooth slowing capacity. The table below shows the exact conversions so you can match your source footage to your target speed.

Common Mistakes That Produce Stuttery Results

Three errors account for most bad slow motion. First, using low-frame-rate footage as the source — 24 or 30 fps clips break apart below about 70 percent speed. Second, forgetting that high frame rates need more light: the faster shutter speed required for 120 fps capture reduces exposure, so dim footage looks noisy when slowed. Third, leaving audio on — a slowed track drops in pitch and drags the rhythm, which can ruin the intended dramatic effect. Mute or remove the original audio and replace it with a separate track for clean results.

One Rule to Take With You

The single factor that determines whether a slow-motion edit looks professional or amateur is the capture frame rate. Shoot at 60 fps or higher when you know a scene will be slowed. For existing footage, match the method to your tool — Adobe Express for a one-off browser edit, Premiere Pro or CapCut for deeper control. Start with the best source material you can, and the edit itself becomes almost effortless.