How to slow down/speed up a video on iPhone?

No matter you want to create a slow-motion effect, create a sped-up effect, correct for camera shake, create a comedic effect, or make a video more visually interesting on your mobile phone, here are some methods to change the speed of video playback. So, keep reading.

Change the speed of video playback on iPhone

The ways to slow a video down on your iPhone

1. Using the Photos app (the built-in slow-motion feature)

Open the Photos app and find the video you want to slow down.
Tap the Edit button in the top right corner.
Tap the Speed button in the bottom toolbar.
Drag the slider to the left to slow down the video.
Tap Done when you're finished.

2. Using iMovie

Open iMovie and create a new project.
Import the video you want to slow down into iMovie.
Drag the video clip to the timeline at the bottom of the screen.
Click on the video clip and then click on the Speed button in the top toolbar.
Drag the slider to the left to slow down the video.
Click on the Export button in the top right corner to save the video.

3. Using a third-party app

There are a number of third-party apps that allow you to slow down videos on your iPhone. Some popular options include Videoshop, SlowMoVideo, and FilmoraGo. Note that using a third-party app may reduce the quality of the video. To use a third-party app to slow down a video, follow these general steps:

Open the app and import the video you want to slow down.
Tap the slow-motion button.
Drag the slider to set the speed of the slow-motion effect.
Tap Save when you're finished.

Here are some tips for slowing down a video:

Use a high frame rate: The higher the frame rate of the video, the smoother the slow-motion effect will be.
Choose the right subject: Slow-motion videos work best for subjects that are moving quickly.
Be careful with the audio: The audio in a slow-motion video will be played back at the same speed as the video. This can create a strange effect if the subject is moving quickly.

The ways to speed up a video on your iPhone

It allows you to speed up a video more than 2x, below are the methods.

1. Using the Photos app

Open the Photos app.
Find the video you want to speed up.
Tap Edit in the top right corner.
Tap the Speed slider at the bottom of the screen.
Drag the slider to the right to speed up the video.
Tap Done when you're finished.

2. Using iMovie

Open the iMovie app.
Tap the + button in the top left corner.
Tap Movie.
Tap Import Media.
Select the video you want to speed up.
Tap Create Movie.
Drag the video clip into the timeline.
Tap the clip to select it.
Tap the Speed button in the inspector at the bottom of the screen.
Drag the slider to the right to speed up the video.
Tap Done when you're finished.

Here are some additional tips for speeding up or slowing down videos on iPhone:

You can speed up or slow down a video by up to 10x the original speed.
You can also create ranges within a clip where the speed is different from the rest of the clip. To do this, drag the yellow range handles at the beginning and end of the range.
You can adjust the audio speed to match the video speed. To do this, tap the Audio button in the inspector and drag the slider to the right to increase the audio speed or to the left to decrease it.
You can export your sped up or slowed down video in a variety of formats, including HD, 4K, and Full HD.