How to Make a Slow-Motion MP4 Video on Windows/Mac/iPhone/Android

November 05, 2021Ashley Mae

Some moments are too fast. If you want to figure out what happens and get all details, you need to slow down a video. The video slowing down effect is easy to achieve. You can use a video speed changer to slow down an MP4 video on your phone or computer easily. Want to know how to make an MP4 video slower than the original speed? Just read and follow.

Speed Down MP4

Part 1: How to Slow Down an MP4 Video on Windows/Mac

You can get an easy-to-use video speed controller from Aiseesoft Video Converter Ultimate. There are multiple pre-made slow down presets. You can slow down an MP4 video in 0.125x, 0.25x. 0.5x, and 0.75x. Instead of complicated options, you can quickly make a slow-motion video.

The program supports 1000+ video and audio formats. You can slow down a video in MP4, AVI, MKV, FLV, WMV, and many other formats. Moreover, you can edit an MP4 video before changing the video speed. Here you can crop, merge, rotate, flip, trim, and apply other video editing effects. In a word, Aiseesoft Video Converter Ultimate is a beginner-friendly and useful video speed editor.

Video Converter Ultimate


Aiseesoft Video Converter Ultimate

  • Slow down an MP4 video with 0.125x, 0.25x, 0.5x, and 0.75x speed.
  • Edit a slow-motion video by cropping, trimming, rotating, etc.
  • Enhance video quality or compress file size on your MP4 video with slow down effect.
  • Adjust the output video frame rate, resolution, bitrate, and quality before exporting.
  • Compatible with Windows 11/10/8.1/8/7/Vista/XP and Mac OS X 10.12 or higher.
Free DownloadFor Windows

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Step 1:
Free download, install, and launch Aiseesoft Video Converter Ultimate. Click Toolbox on the top toolbar. Find and click Video Speed Controller.
Step 2:
Drag and drop your MP4 video into the main interface. The default video speed is 1x. You can slow down an MP4 video file at 0.125x, 0.25x, 0.5x, or 0.75x in one click.
Video Speed Controller
Step 3:
Click the gear Settings icon to adjust output video settings. Moreover, you can adjust the video name, output folder, and others. At last, click Export to save an MP4 video with a slower playback speed.

Part 2: How to Slow Down an MP4 Video Online

There are also many online free slow down video websites you can choose from, such as Clideo, Ezgif, Kapwing, Fastreel, and more. Here you can make a slow-motion video online with Clideo. There will be a watermark in the Clideo free version. Make sure you run a strong Wi-Fi connection. Otherwise, the MP4 video slowing down process may take a lot of time.

Step 1:
Visit Clideo video speed changer on your browser.
Step 2:
Select Choose file to import an MP4 video from local drive, storage, Google Drive, or Dropbox.
Step 3:
It takes some minutes to complete MP4 video uploading.
Step 4:
Slow down video speed at 0.25x or 0.5x quickly. Or you can drag the Change video speed slider to slow down MP4 freely.
Step 5:
Choose Export to slow down MP4 video online with a watermark.
Change Video Speed

Part 3: How to Slow Down an MP4 Video on iPhone and Android

As for mobile video speed changer apps, you can choose from iMovie for iPhone, Perfect Video, Video Speed, SpeedPro, and more. You can control the video speed and slow down an MP4 video on Android and iPhone with ease.

How to Slow Down an MP4 Video on iPhone

Step 1:
Open the iMovie app. Tap + to create a new project.
Step 2:
Find and tap the Speed icon on the bottom of the iPhone screen, which looks like a speedometer.
Step 3:
Drag the slider to the left to slow down MP4 on iPhone.
Step 4:
Tao Done to finish MP4 slowing down.
Step 5:
Share or save your iPhone MP4 video in slow motion
Slow Down MP4 on iPhone

Step 1:
Download and install a slow-motion video app on Android, such as Slow Motion Video FX.
Step 2:
Upload the video that you want to slow down.
Step 3:
Use the on-screen options to make your MP4 video slower than before.
Step 4:
Edit the MP4 video file according to your needs.
Step 5:
Save the slow motion MP4 video to Android.
Slow Down MP4 on Android

Part 4: FAQs of Slowing Down MP4

Can you slow down an MP4 video by 20% on Mac?

Yes. You can use Aiseesoft Video Converter Ultimate or other online video speed changers to slow down an MP4 file by 20% and other percentages.

How to play an MP4 video and slow down?

You can use Windows Media Player, VLC Media Player, and more to decrease video speed. Go to the certain video playback area. You can find related playback speed settings. Here you can change the speed of an MP4 video while playing.

How to slow down a part of your MP4 video?

Hold R on your keyboard. Drag and select a clip of a video into the iMovie timeline. Choose the desktop video speed editor. You can apply slow speed to the selected video clip.


That's all to slow down an MP4 video on multiplatform. If your MP4 video is in a large file size, it is suggested to use Aiseesoft Video Converter Ultimate. You can get rid of watermark, maximum file size, Wi-Fi speed and many other limits. As for MP4 files lower than 100MB or so, you can edit and slow down MP4 videos online as well. As for iOS and Android users, you can make a choice among video speed change apps.

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Video Converter Ultimate box

Video Converter Ultimate is excellent video converter, editor and enhancer to convert, enhance and edit videos and music in 1000 formats and more.

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