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How to Speed up a Video Online and on iPhone for Free

Last Updated: 2022. 05. 16

Great videos never stay at a consistent speed. As you edit a Vlog or a video tutorial for YouTube, very often you need to speed up a video or portions of the video to fast-forward repetitive steps or add rhythms and styles to mundane scenes for better storytelling.

So, in this tutorial, we will walk you through how to easily speed up a video or parts of the video on your computer and iPhone using a flexible online video editor and 2 watermark-free mobile apps. So, let’s rock and roll, now!

Speed up a drone video by FlexClip online video maker

Here’s what you will learn:

How to Speed up a Video for Free by FlexClip Online Video Editor

If you don’t have an ideal video editor on PC, using a free and easy-to-use online video editor can be the best option to speed up a video online with ease. A go-choice is FlexClip. It’s a feature-packed online video maker that allows you to easily speed up a video up to 8x faster than the original video speed, capable of creating a time-lapse video.

speed up a video or parts of a video to 8x by FlexClip online video maker

Easily speed up a video or parts of a video to 8x by FlexClip online video maker

Step 1
Upload your footage to FlexClip from the local PC or your mobile phone and add it to the timeline.
Upload footage to FlexClip and add it to the timeline

Upload footage to FlexClip and add it to the timeline.

Step 2
Speed up the entire video or portions of the video: To speed up the entire video, select the clip and click the Speed Controls tool above > drag the speed slider to the right, then you can speed up the video to 1x, 1.5x, 2x, 2.5x, 3x, 4x, all the way up to 8x.
Drag the speed slider to the right to speed up the entire clip

Drag the speed slider to the right to speed up the entire clip

In actual video editing, in many cases, you need to speed up portions of the video, sometimes even at a different speed to add rhythm and styles to your videos. With FlexClip’s intuitive timeline and speed controls, everything comes easy.

All you need to do is move the playhead to locate the beginning and end of the video you want to speed up > click the Split tool to cut off portions of the clip you wish to speed up > with the clip selected, click Speed Control above > drag the Speed slider to the right to speed up a video up to 8x as you wish.

Split the clips you wish to speed up and speed up selected clips

Split the clips you wish to speed up and speed up selected clips.

Another trick is that you may add a Fade video transition and Whoosh transition sound effects to smooth out the sequence.

Here is the resulting video with different speeds and transition sound effects from the above example:

Speed up portions of a drone video by FlexCLip

Bonus Tips
As you speed up a video, the original video duration will be shortened. The faster the speed, the less the video duration will be. When needed, you may drag the Speed Control slider to the left to slow down the video to 0.5x, and 0.2x slower.
Besides, if the original footage has audio, after you speed up the video, the audio pitch will be distorted. FlexClip will automatically mute the audio of the video. You can use FlexClip’s royalty-free music or sound effects to fill the audio gap. Check how to add sound effects to a video.
Step 3
Export and share: You can download the video in MP4 to your local PC or directly share it to YouTube, Dropbox, or Google Drive. FlexClip will also generate a clickable link and embed code for your video.
Multiple ways to share a video

Multiple ways to share a video

Also, read how to speed up a video in Adobe Premiere.

How to Speed up a Video on iPhone for Free by iMovie and CapCut

Nowadays, using iPhone to shoot full high-definition (1080P) or even 4K (2160P) videos has become popular for content creators like make-up artists, various Vloggers. While many free mobile apps can help you speed up a video on iPhone.

Here we would recommend two watermark-free apps to quickly and easily speed up your videos on iPhone: one is the iMovie and the other is CapCut.

1. How to Speed up a Video on iMovie

iMovie is a built-in app on iPhone and can help you speed up a video in a breeze.

Step 1
Launch iMovie App and Tap “Create Project”.
Create a video project in iMovie

Create a video project in iMovie

Step 2
Select a Video from Camera Roll and Tap “Create Movie”
Select a video from the camera roll

Select a video from the camera roll

Step 3
Speed Up the Video: Tap the “Speed Control” icon, which looks like a speedmeter, and drag the slider to the right, then you can speed up the video by 2X and tap “Done” on the top left corner.
Speed up a video by 2X

Speed up a video by 2X

Step 4
Tap the “Share” button to Save the Video on iPhone or Other Social Media Apps.
Share the edited video

Share the edited video

2. How to Speed up a Video on CapCut

CapCut and TikTok are both developed and owned by ByteDance. If you are an avid TikTok user, then you should equip your iPhone with CapCut for video editing, a free and epic mobile app that offers you 2 different ways to speed up a video on your iPhone.

Step 1
Launch CapCut and Tap “New Project”.
Create a new video project in CapCut

Create a new video project in CapCut

Step 2
Select a Video from Camera Roll and Tap “Add”.
Select a video from the camera roll

Select a video from the camera roll

Step 3
Speed up the video: Tap the “Speed” icon and then CapCut will offer you two options to speed up a video.
CapCut offers 2 options to speed up a video

CapCut offers 2 options to speed up a video

  • Option 1: Normal. You can speed up a video at the same speed throughout the entire video. All you need to do is drag the speed control slider to the right to speed up a video to 1X, 2X, 5X, 10X, even a stunning 100X. Once, you are satisfied with the new speed, tap the “✓” icon.
  • The normal way to speed up the entire way by up to 100X

    The normal way to speed up the entire way by up to 100X

  • Option 2: Curve:. With the curve speed controller, you can customize speeds for different parts of the same video. To speed up a video, just drag the dot upward; to slow down a video, just drag the dot downward. The higher the dot, the faster the speed, and vice versa.
  • Speed up different parts of a video by curves with CapCut

    Speed up different parts of a video by curves with CapCut

    CapCut also offers you some premade speed curves for customization. Feel free to experiment. Done with the speed change, just tap the “✓” icon.

    Step 4
    Preview and Share.

    Now, It's Your Move

    You don’t need to buy an expensive video editor like Adobe Premiere Pro to speed up a video. With FlexClip and helpful mobile apps like iMovie and CapCut, you can easily speed up a video online or on your iPhone. Hopefully, you will find our tutorial makes sense to you. So, start speeding up your videos for video tutorials or promo videos now.

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