crop mp4 videoSometimes when you shoot a video in MP4 format and later you find that there are black edges on your movie, what would you do? If you get some knowledge about video editing, you probably know that this problem can be easily fixed by cropping it with a useful tool.

There are so many video editing programs in the current market that claims to be the best one, and you may be wondering which one is actually the best video cropping tool. Well, in this guide, we just show you three top and easy methods to crop MP4 video on your Mac or PC efficiently.

Part 1. How to Crop MP4 Video with TunesKit AceMovi Video Editor

In order to crop your MP4 video files, what you need is a useful video cropper tool. Among multiple different programs in the market, the AceMovi Video Editor from TunesKit is a nice option. It can help both Windows and macOS users to crop any video file within a few clips. Most important is that, it will not lose the original quality of the file after cropping. You're also allowed to change the aspect ratio according to your needs. Besides MP4 files, it also supports a wide range of media file formats such as WMV, MOV, AVI, 3GP, MPEG, etc.

TunesKit AceMovi is well-designed with a simple interface, with neat buttons and navigations. Both beginners and professionals can easily learn how to use the program in a few minutes. In fact, this video editing software is equipped with many advanced editing tools as well. You can record the screen and edit the video by applying filters, transitions, animations, split-screen effects, text or background music, etc. In addition, there are so many flexible output options for you, including various media formats, mobile devices or web video sharing platforms, etc.


TunesKit AceMovi Video Editor

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  • Easily crop MP4 video files on Mac or PC
  • Crop MP4 or other videos with high quality retained
  • Allow you to adjust the aspect ratio of your video
  • Provide filters, transitions, text, sound effects, music, etc.
  • Friendly UI and easy of use

3 Steps to Crop MP4 Video on Mac/PC with TunesKit AceMovi

First of all, you're suggested to hit the Download link above to download and install TunesKit AceMovi on your Mac or PC computer. Then just follow the simple steps below to crop your MP4 video file easily.

Launch AceMovi and Add MP4 File

add video

Open TunesKit AceMovi Video Cropper program on your computer. After that, click the big "+" icon or "Import" button to add your target MP4 video footage. Next, you need to drag the file from the media bin and drop it to the timeline.

Crop MP4 Video

crop video

In this step, you have two ways to crop your MP4 video files. First, right-click on the file and choose the "Crop" option. A new window will come, along with two preview sections for you. You can now crop the unnecessary parts of your file and see every change you made on the preview windows. The second method is to click on the file and then click the "Crop" icon crop icon on the toolbar. And then crop the MP4 file based on your needs.

Export the Cropped Video

export video

After you've set it all, just click the OK button and exit the windows. Then click the yellow "Export" button to save your cropped MP4 video file. Here you'll be able to select an output format for your file, change the file name or output path. Then click the Export button again to confirm the action. Your cropped file will be saved to your local computer in one minute.

Part 2. How to Crop MP4 Video on PC/Mac with TunesKit Video Cutter

Although it usually used as a lossless video cutter, TunesKit Video Cutter also works well in video cropping. Not only MP4 video format, it supports tons of other video file formats including MOV, AVI, WMV, M4V, MPG, MPEG, 3G2, 3GP, ASF, RM, RMVB, DAT, FLV, MKV, VOB, OGV and so forth. Besides, you can also save and export the edited video file onto various portable devices such as iPhone, Galaxy, Windows Phone, Xbox, PS4, smart TV, etc.

TunesKit program provides you a real-time preview function to crop your MP4 video, so that you see any change you made in the preview windows. Furthermore, this video editor can do more than just cropping videos; users can also add background music to the video, apply watermarks, subtitles, special effects, trim and rotate the video clip, etc. The program is available for Windows and Mac systems, so you can use it to crop MP4 video files on PC or Mac as you like.

  • Easily crop MP4 video Mac or Windows platforms
  • Support numerous video file formats and mobile devices
  • Provide multiple other video editing features
  • Real-time preview function is offered

How to Crop MP4 Video Free with TunesKit Video Cutter

Cropping MP4 video file with TunesKit is very easy and users can finish it in just 4 steps. The free version of TunesKit Video Cutter offers you five chances to crop the video file at no cost. Now just follow the simple guide below.

Open TunesKit and add MP4 file

add video

Before getting started, you need to download and install TunesKit Video Cutter program on your computer. After that, just double click the icon and launch TunesKit. Next drag and drop the MP4 file you'd like to crop to the software, or click the "Open" button to browse your target MP4 file from the local folder of your computer.

Crop MP4 video in TunesKit

crop mp4 video on win

Once the file is imported successfully, you can then click the Edit icon editor icon and here comes a editing window. There are six options on the top menu bar, press the "Adjust" one. You will see two preview windows. You can move the white lines to zoom in or out the original video file in left window and then see the effect in the right window. Alternatively, you can simply enter the accurate value for the width and height of the video file in the section of "CropArea Size". Afterwards, click the OK button to escape the window.

Select an output mode

set output

Then you need to choose an output format in this step. Select the Encoding Mode here and you're also allowed to change the file format, quality and codecs. And then choose an output video format or device according to your needs. Hit the OK button to close this popup window.

Start to crop and save the video

convert video

After all settings are ready, you can now click the Start button to ask TunesKit to crop the MP4 video file for you. A few seconds later, you can find your new cropped video file from the destination folder.

Part 3. How to Crop MP4 Free with Online Tool

The last easy solution that you can use to crop MP4 video for free is to take advantage of some online video cropping tools. There are several such tools on the Internet such as Online Video Cutter,, Clideo, etc. After tested some of them, Online Video Cutter is recommended here because of its speed and simplicity. The following is the quick instruction to show you how to use crop MP4 video online on the computer.

crop mp4 vide online

Upload MP4 video file

First of all, please visit the official site of Online Video Cutter on your web browser. Then click the Choose file button and import the MP4 video you want to crop. Click the small dropdown triangle button and it offers you opportunities to upload video from Dropbox, Google Drive or online.

Crop the MP4 video

Then you'll see your MP4 video in the preview window. You can now move the blue frame to crop the MP4 file based on your requirements. Or click the Crop icon on the left to choose a resolution ratio you want. There are several ratios for your reference like 4:3 for classic TV, 4:5 for Instagram, 16:9 for widescreen TV, etc.

Save the cropped MP4 video

After set all the preferences, now click the Save button on the lower right corner. Wait a while until the processing is done. Afterward, you can click the Download button to export the new video to your computer or transfer it to the Dropbox or Google Drive.

Comparison: Which Video Cropping Tool Is Best for You?

Next, you can see the following chart and make your wise decision among these good cropping software for MP4 files.

  TunesKit AceMovi TunesKit Video Cutter Online Video Cutter
High-quality Cropped Video Very High High Medium
Aspect ratio options
Other basic editing
Other advanced editing × ×
Ease of use Easy Very Easy Easy
Supported system Desktop (Mac & Windows) Desktop (Mac & Windows) Web-based
Price $19.95/month Free (5 times) Free

The Bottom Line

So these three methods can help you crop MP4 video on Windows or Mac computer and each has its pros and cons. You can try them and find a better option. The online tool doesn't require you to install any software, yet its success rate has much relation to the Internet connection speed and it might be unstable sometimes. TunesKit AceMovi is chargeable, yet it will guarantee a good user experience with high performance and high output quality. So you can give it a try if you care more about the quality. If you still want a free tool, TunesKit Video Cutter can also be a good choice.