Wondershare Filmora9
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 Filmora9 video editor and Ezgif.

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 Filmora9 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 Filmora9. You can download Filmora9 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 Filmora9 easily.

1. Add video files to the Filmora9 video editor

Click Import on the media library 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 Filmora9 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 right click on it to click Speed and Duration. A pop-up window will appear. Speed numbers will indicate how fast or slow the motion effects will be. Then adjust the speed you want. You can view the effects in the preview window to make video faster or slower. If you think it is too much, 0.5 speed is a good choice.

  • 0.5: half of the original speed (Slow Down, Half)
  • 1: The original speed
  • 2: Double the original speed (Speed Up, Double)
  • 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.

Note: 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.

fast slow motion video

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. You just need to double click the audio clip to edit in the audio edititing panel. You can edit fade in/out, remove background noise and more.

video faster

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 when making a video faster or slower.

Download Win VersionDownload Mac Version

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

Filmora9 also allows you to adjust the duration of the video clip to change the video speed. After importing the video clip to the timeline, right click it and choose Speed and Duration to open the custom speed pop-up. 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. Just directly input the number in the field to speed up/slow down video.

make video faster

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

Part 3: How to Speed up & Slow Down Video Speed Online

If you want to speed up/down video online, Ezgif is an online tool that you can consider. You can import video from your PC or just paste a video URL. So easy to use. Below are the steps to change video speed.

Step 1: Open Ezgif, and then click import file button to upload your video. After it is done, click Upload video. Depending on the size of video, it may take for a while.

make video faster

Step 2: After it is imported, a editing page will appear. You can adjust multiplier number. The bigger it is, the faster your will be. Tick the change speed for sound. Now, click Change video speed to start speeding up video.

make video faster

Step 3: Save the video when finished. Click the three dots on video and then select download.

Note: the max file size is 100MB. It supports MP4, WebM, AVI, MPEG, FLV, MOV, 3GP and more. Plus, the importing speed is slow.

As you can see from here, if you want to have more options to change video speed and have a faster importing speed, online solution is not best for you.

Conclusion

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 Filmora9, 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 Filmora9 provides, check this introduction video below.

Download Win VersionDownload Mac Version

In fact, except for Filmora9, many other video editing software can help you do this effect, professional tools like Adobe Premiere, Sony Vegas, Final Cut Pro. Just choose one and get started. Let us know your opinions in the comments section below.

Jan 04,2019 18:33 pm
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Comment

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

macyshaw
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?! :(
disqus_rll3TOEObH
How to remove shutter between video fragments when I make speed up or slow down.
disqus_rll3TOEObH
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 /
disqus_HTWLoHOgtW
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.
maitlin_hart
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?
fzoulcmbyl
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?
disqus_pl8cyKoMdB
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?
disqus_KCZ4UnMM4a
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.
disqus_KCZ4UnMM4a
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
disqus_KCZ4UnMM4a
Drag and drop your video footage to the first video track and try it again.