Wondershare Filmora
Create Fast/Slow Motion Videos at Any Speed You Want
  • Up to 100x fast mo and 0.01x slow mo.
  • Various filter and overlay effects to touch up your video
  • A wide support for different formats.

How to Make Slow/Fast Motion Videos (Speed Up/Slow Down Effect)

Fast motion/slow-motion effects, also known as Speed Up/Slow Down effects in video production, which make the video clips play faster or slower than original speed. Usually, the slow-mo effect can give us a "close-up in time", and introducing a feeling of surreality, while the fast motion effect or video acceleration effect is used to make videos dramatic or funny. Also, you can speed up the video to playback all scenes and make the video shorter.

Whether you want to watch YouTube videos in a slow motion with a video slow downer, or speed up and fast forward the long scenes on your Windows or Mac computer, you will find there are many video editing software available for slow down or speed up videos on your Windows or Mac computer, such as Windows Movie Maker or iMovie video editor. While in this article, we are going to only show you how to make these effects in post-production with Wondershare Filmora video editor.

Note: If you prefer to edit your video footage on your phone, check How to Make Amazing Slow Motion Videos on Android.

Part 1: How to Speed up & Slow Down Video Speed by Adjusting Speed [3 Steps]

Wondershare Filmora is such a video editor that we'd like to introduce to you whether you are using a Windows or a Mac computer, with this simple video editor, you can quickly speed up and slow down videos. Read on to see how to speed up or slow down your creativeness. Below is a video tutorial about how to add fast/slow motion video effects with Filmora. You can download Filmora now and have a try.

Download Win VersionDownload Mac Version

Apart from the slow/fast motion video tutorial, you can also follow the steps about how to speed up and slow down videos below and make a slow-motion or fast-motion videos with Filmora easily.

1. Add video files to the Filmora video editor

Click "Import" on the media library window and select the video files from your computer to add them into this program. Alternatively, you can simply drag and drop files to the User's Album. Wondershare Filmora supports almost all regular video formats, such as MP4, AVI, WMV, MOV, FLV, M4V, MPG, VOB, ASF, 3GP, 3G2, F4V, MPEG, TS, TRP, M2TS, MTS, TP, DAT, MKV, DV, MOD, NSV, TOD, EVO, etc.

slow motion and fast motion

2. One click to speed up or slow down

Next, drag videos from the User's Album to the video track on the Timeline, and then double-click the added video to open video editing panel. Locate the Speed option, and the speed numbers will indicate how fast or slow the motion effects will be. Adjust to the speed you want.

Note: To change the video speed and make a slow motion/fast motion video, please add your video footage to this first track.

  1. 0.5: half of the original speed (Slow Down, Half)
  2. 1: The original speed
  3. 2: Double the original speed (Speed Up, Double)
  4. Other speed available to choose: 0.1 times, 0.2 times, 0.25 times, 0.33 times, 0.5 times, 2 times, 3 times, 4 times,5 times, 10 times etc.

fast slow motion video

You can simply change the video speed by dragging the speed slider. To speed up the video to make a fast motion effect, drag the slider to the right. To slow down the video to make a slow motion effect, drag the speed slider to the left. You can always drag the slider to set to an optional video speed rate.

3. Adjust Audio Sound [Optional]

Whenever you speed up or slow down the video playback speed, the video audio speed will change accordingly. If you want to keep the original playback speed of the video audio, you can detach the audio from video first and then do some editing to make a perfect pitch to the video.

 Filmora Audio Detach

Besides, you can also add a new sound to the video to replace the original video audio, for the specific steps, check our guide about How to Replace Audio in Video.

4. Export fast/slow motion video

When you have finished adjusting the video speed, click "Export". You can save video in any popular formats by clicking "Format". If you want to play your new video creation on your iPod, iPhone, iPad, click "Device" and select the icon for your devices. You can also share your videos on YouTube and Vimeo directly or burn video to DVD disc.

save speed up, slow down effect

Keep in mind that when you adjust the video speed to speed up or slow down a video clip, there are some dos and don’ts that you should pay attention to. Our YouTube official channel has made a video about it, watch the video below and let’s know if it is useful for you.

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Part 2: Make Slow Motion & Fast Motion Video by Changing Video Duration

Filmora also allows you to adjust the duration of the video clip to change the video speed. After importing the video clip to the timeline, double click it to open the Editing panel. Go to Duration section and you will see the original duration of the video. Adjusting the duration of the video longer will add a slow motion effect to the video. Changing the duration of the video to a shorter time will speed up the playback speed of the video.

 Filmora Speed change

Preview the video to check if it gets the best fast motion or slow motion effect and then save and export it.

Tips: Above are two ways of speeding up or slowing down a video playback speed, besides fast motion and slow motion video effects, you could also do some basic as well as advanced editing with Filmora, such as rotating, reversing, chroma keying, etc., what's more, there are lots of preset video effects that you can use to give your video a hollywood look. If you want to know more features that Filmora provides, check this 60s introduction video below.

Download Win VersionDownload Mac Version

In fact, except for Filmora, many other video editing software can help you do this effect, professional tools like Adobe Premiere, After Effects, Sony Vegas, Final Cut Pro, and basic tools like Windows Movie Maker, iMovie. Just choose one and get started. Let us know your opinions in the comments section below.

Sep 04,2018 17:13 pm

Product-related questions? Speak directly to our Support Team >>

For me this speed thing isn't coming up, when I double click and the editing tools come up speed isn't one of them. instead of speed and all the other sliders it comes up with 'motions'. what do I do?! :(
How to remove shutter between video fragments when I make speed up or slow down.
when I increase the speed of the video fragment at the end of the fragment I have black frames / before the video fragment with normal speed /
I really like this editor and use it all the time for my youtube videos. I have a couple suggestions, or observations. It's not unusual for me to do videos over 10 minutes long, so I often speed up segments to shorten the content. I find that I have to render the timeline to get the speed correct. Only then will it show the true speed adjustment. Also, every time I edit a sped up segment, such as splitting and deleting, it messes up the speed, and I have to render again. For very short videos that's not a big issue, but when you're trying to edit a video almost 20 minutes long, it takes a long time to rerender, sometimes a half hour.
I just started Filmora and I enjoy it when I edit My YouTube videos, but when I fast-forward one clip, I hear my voice in the next clip after some time while the fast- forward clip is still going . How do I fix this?
My original file is an MP4 audio file that is 136MB, the only thing I did is change the speed to 1.25 and when I go to save it, it says 2.3 GB. What am I doing wrong here?
Hi, I need to speed up a video clip to 15x and mute the audio. The only way to speed up the clip 15x is through the action cam tool, however I don't see any option there to mute the audio?
Filmora allows users to do variable speed change in Action Cam Tool now, maybe it will add the feature in the Full Feature mode too. You can try change speed in Action Cam Tool mode if your footage is in H.264 MP4/MOV or H.264 MTS/M2TS format.
Yeap, Filmora is easy to use. I am really new to video editing, but after using Filmora, I think video editing is easy, especially for beginners like me. LOL
Drag and drop your video footage to the first video track and try it again.
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