How to Resize MP4 Videos

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How to Resize MP4 Videos

MPEG-4 or more commonly known as MP4 is a multimedia file format container. It is a widely used file extension format that is readable, on almost every digital device. MP4 files can be anything from images and audio files, but the most common file where MP4 is used, are videos. The reason behind this is because MP4 formats are readable, and playable on almost any device. However, there are certain conditions where one needs to resize or compress an MP4 file. One example is when you want to upload a video to the internet, but it exceeds the file size limit. Therefore you will have to compress it to reduce file size. To learn some of the best tools to resize MP4 videos, continue reading this post.

Acethinker Video Converter Online

First on the list, is Acethinker Video Converter Online, which as the name suggests is an online tool. The tool is web-based, which means that it does not need any installation and is always ready to use. The only requirement, however, is an internet connection since it is web-based. Acethinker Video Converter Online, like any other video converter, can resize MP4 videos and other file formats as well. The tool supports all file formats available, and have a wide range of options available to enhance videos. It makes Acethinker Video Converter Online one of the best opportunities to resize MP4 online. To learn how to use the tool, follow the steps below.

Step1 Launch the application

The tool is always available to use, all you need to do is to launch it by clicking the button below. After clicking the launch button, a window will appear. From the pop-up window, select which video to resize and click “Open” to upload it to the tool. For first time users, you will be required to install an online launcher which does not take a couple of minutes to install.

Select files to start

Step2 Open the settings window

Once the video is uploaded, click the “Edit” button and the “Advanced Settings” window will appear.

launch the edit window

Step3 Adjust the size of the video

On the new window, scroll down to the “Crop” section, and under the “Size” option, enter the height and width you want for the video. Once done, click the “OK” button to apply the changes you made.

resize the video

Step4 Save the changes

Back to the main screen, click “Format” if you want to change the file format or retain it as an MP4. Lastly, click the “Convert” button and select where to save the video to save the changes that were applied to the video.

save the changes made

Acethinker Video Master

Another tool that enables you to resize MP4 videos is Acethinker Video Master. Video Master is a multi-functional tool that is not only a converter but a screen recorder and a screen splitter at the same time. It is indeed a versatile tool with many essential functions. The converter allows you to edit videos, as well as resize them without affecting the original quality of the video. Aside from that, it still has a lot to offer when it comes to video enhancements. To learn how to use Acethinker Video Master, follow the steps below.

Step1 Download and install Video Master

Install the application to your PC by clicking the buttons below to download the installer. Once the download is complete, run the installer and follow the setup wizard.

Try It for Free

Step2 Launch the tool

After installation, launch the application to reach the main interface. From the home screen, click the “Add files” button and select the video to resize.

add the video file

Step3 Launch the editing panel

Once the video is in the tool, click the “Edit” button to open the editing panel.

edit the video

Step4 Change the video resolution

From the panel that just appeared, click the “Adjust” tab, and click the drop-down menu for “Aspect Ratio” then select the resolution needed for the video. Once you decided with the resolution, apply it by clicking the “OK” button.

resize the video

Step5 Change the file size of the video

Another way to resize the MP4 video, is by changing its original file size. This way, you can control the space that it will consume on your device. On the main screen, click the “Size” button and from the pop-up window, select “Custom” and set the right file size to your preference and click “OK” to apply them.

enter the file size

Step6 Save the resized video

Once back to the main screen, select where to save the video from the “Destination” tab, then save the changes to the video by clicking the “Convert” button.

save the applied changes


tool interface VideoSmaller is an online video resizer. As the first tool, it is a web-based application that needs an internet connection to work. This tool can resize and compress MP4 videos not exceeding 500MB in file size, without affecting the image quality too much. For an online video resizer, this one is a decent choice for those who are in a hurry and want to get results with just a few clicks. The can also remove audio from a video with its audio remover option. All in all, it is a tool that is worth trying out, to get fast and decent resized MP4 videos.


iMovie is the built-in video editing application for Mac devices. Packed with video editing tools and options like any other video editor, it can perform the job efficiently. One capability of iMovie is that it can resize MP4 videos fast and without compromising the quality. To learn how to use iMovie to resize MP4 videos, follow the steps below.

Step1 Launch iMovie

Open the tool by clicking “Finder” and under “Application” look for iMovie.

launch imovie

Step2 Import the video to resize

On the tool interface, click the “Import files” button and select the video that needs resizing.

import the files

Step3 Crop the video to resize it

After importing the video to the tool, drag it to the timeline. Next, on the right side of the screen, click the “Crop” button and drag the frame to cover the parts to be retained then click the “Done” button once finished and saved the video.

crop the video

Step4 Save the video

To save the resized video to the Mac device, click the iMovie menu tab, and select “Save” and fill out the information needed.

save the video


Learning how to resize MP4 videos can come in handy most of the time. For vloggers, when they upload videos to video sharing sites, there are specific requirements that need to be met. Also, when watching something on a larger screen, to have optimum viewing experience, you can resize the video to fit the screen. On that note, you can use the tools mentioned above when you need to resize an MP4 video. These tools are easy to use and packed with other video enhancing features, especially Acethinker Video Master.
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February 1, 2019

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Last updated on February 19, 2019

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