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By Eric Pascal - Last Updated: Contact Author

iPhone Video Speed Control: How to Speed Up/Slow Down Videos on Your iPhone by 16X/0.1X

Summary: The post provides 2 easy ways for you to speed up or slow down iPhone videos instead of using the default Photo app of iPhone. The two ways, friendly to beginners, rely on different operating systems. Please read on and give each a shot.

iPhone's built-in Photo app makes it simple to speed up slow-motion videos you took with your iPhone 5S or later and convert your slo-mo video back to normal speed. But it lacks the competence to manipulate the speed of normal video (4k/1080/720p 60/30fps) or fast motion (time lapse) footage taken by iPhone. Don't be upset, we are going to show you how to easily change the speed of your iPhone videos, including slow motion and fast motion videos, in two different ways.

Part 1: How to Slow Down/Speed Up iPhone Video with VideoProc [Software]

If you want to make your iPhone video play faster or slower than original speed, you can use VideoProc to edit the iPhone video playback speed up to 16X. It is a fresh desktop app that is flexible to adjust video speed like 0.1X, 0.25X, 0.5X, 2X, 4X, 8X and 16X. On top of that, it is pretty simple to do any video processing tasks, be it speed control, quality enhancement, video editing, or encoding. Just follow the steps below and learn how to speed up and slow down your iPhone Video easily.

Edit iPhone video speed

Download the Video Speed Controller - VideoProc

  • - Change the speed of iPhone video from 0.1X slower to 16X faster.
  • - Convert iPhone slo-mo video from 240fps/120fps to 60/30/24fps.
  • - Adjust video resolution from 4k to 1080p/720p and vice versa.
  • - Convert video to/from iPhone, e.g. HEVC to H.264, AVI to MOV, MKV to MP4, etc.
  • - Edit, cut, trim, crop, merge, deshake, denoise iPhone video, add effects, and more.

Prior to adjusting speed with VideoProc, make sure to transfer your video content from iPhone to Mac or PC first.

Step 1: Add iPhone Video to the Video Speed Controller

Launch VideoProc, click Video icon on the main interface, press +Video button to add the iPhone video from your computer hard drive. VideoProc accepts any video took from any smartphone, camera, camcorder or drone.

Step 2: Initiate Video Editing Option

Click Rotate button under the pending file to get access to the Video Edit panel.

Step 3: Adjust Video Playback Speed

At the bottom of the new panel where you will see the Playback Speed. Drag the slide bar to choose the playback speed you want to set the iPhone video to:

0.1x (slowest. 10x slower than original speed)

0.25x (slower. 4x slower than original speed)

0.5x (slow. 2x slower than original speed)

1x (normal. The original speed of video)

2x (fast. 2x faster than original speed)

4x (faster. 4x faster than original speed)

8X (faster. 8x faster than original speed)

16x (fastest. 16x faster than original speed)

You can preview the video as per your needs and then press Done.

Speed up/slow down iPhone Video

Step 4: Choose Video Format (Optional)

At the bottom of the interface, you are allowed to choose the target format as you want. You can keep the iPhone MOV H.264 video unchanged or choose MP4 H.264 as the output format in case of wider compatibility with HDTV, gaming system, smartphone, or tablet. Note: the program has been updated to support the latest iPhone models XS and XS Max.

Step 5: Start Speeding up or Slowing down iPhone Video

Click Browse button to save the resulting file in the output folder. Press RUN button to begin the speed and video duration adjustment. With full GPU acceleration, VideoProc enables a quick video processing of any video sources.

Part 2: How to Speed up/Slow Down a Video on iPhone in iMovie [iOS App]

iOS users get accustomed to using iMovie to do some basic edits on iPhone without downloading any third-party software. If you want to increase and decrease your video speed on iPhone but don't know how to do with iMovie, just check the iMovie tutorial below.

Step 1: Launch iMovie app and open your project.

Step 2: tap the iPhone clip in the timeline to reveal the inspector.

Step 3: Press the Speed button at the bottom.

Step 4: Drag the slider bar right to the rabbit-shaped icon to speed up the video or move the slider left to the turtle-shaped icon to slow down the iPhone video.

Step 5: Click Done and choose to Save in HD 1080p, 720p, 540p or 360p as per your needs.

* 2X means twice faster than the normal speed while 1/2x means 2x slower the normal speed.

Adjust Video Speed on iPhone with iMovie

VideoProc vs iMovie: Which Is Better for iPhone Video Speed Control

Indeed, iMovie offers an easy way to adjust the speed of iPhone video. But there are something you need to take into consideration whether to use VideoProc or iMovie for iPhone video speed control. Read on and make your decision later.

VideoProc vs iMovie App







Range of Speed Adjustment

0.1x slower to 16x faster

1/8x slower to 2x faster

Save Option

13 video options incl. MP4, MKV, 4K, HEVC, AVI, MOV, etc
420+ device profiles for iPhone, iPad, Android, PSP, TV, etc.

5 options (4K 30fps/1080p/720p/540p/360p)

Share Option

4 options: YouTube/Facebook/Vimeo/General

3 options: YouTube/Facebook/Vimeo

Video Setting Adjustment

Adjust video frame rates, codec, resolutions, etc

No options available.

Batch Process iPhone Videos



Our Verdict:

1. iMovie for iOS offers flexible speed adjustment ranging from 1/8 to 2x. But if you want to apply a fast forward effect by more than 2x to reduce the total time, try VideoProc.

2. The iMovie's 2x speed option is available on iPhone 5S or newer models. If you shoot video with iPhone 5 or older version, VideoProc is a nice option, which is compatible with all generations of iPhone models, including the latest iPhone XS (Max).

3. If you just focus on unnoticeable speed adjustment and would like to upload your footage on Facebook or YouTube directly, iMovie is a good choice. While VideoProc just enables to encode iPhone video to output format optimized for the video sites.

4. 4k 60fps is not listed in iMovie video export option. To keep the video quality unchanged, try VideoProc. It even makes the iPhone video in a much slower/faster timeframe as per your needs.

5. To speed up or slow down your iPhone video while saving your iPhone space without any loss of quality, VideoProc is your best mate. According to our test, a 7-second iPhone MOV video sized in 8.97 mb is compressed to 4.65 mb in iMovie but 3.71 MB in VideoProc when it is speeded up twice faster. While the size of iPhone MOV video is increased to 15.3MB in iMovie but 1mb decrease with VideoProc when the iPhone video speed is decreased by 2x.

6. VideoProc allows you to speed up or slow down multiple iPhone videos at a time speedily and easily. But with iMovie app, there isn't the option to do the tasks.

7. Doing the iPhone video speed adjustment with iMovie app means you have to be confined to the small 6.5" screen. So chances are that you may be involved in misoperation. But desktop VideoProc operates the speed control on computers that are generally as large as 22 inches. So more details are shown and accurate operation is done.

There are many other ways. For example, you can change video playback speed online, in speed editor or player software.

Watch the Video Guide: How to Edit iPhone Videos with VideoProc


Eric Pascal

Eric Pascal previously held a senior editor role at Digiarty, covering almost any technology to do with Apple, from reviews, complex troubleshooting tips, to software related. Eric's quite adept with photographing & post production subjects. His journey into the world began somewhere in 2012, aiming to help photographer get out of sticky situations. He's also a keen musician and sportsman.
