2 Quick Ways to Resize MP4 Videos [Step-by-Step Guide]

Have you ever uploaded a video only to find it has black bars on the sides, is cropped weirdly, or looks distorted? This is why you need to resize your MP4 video before uploading.

Resizing a video refers to adjusting its dimensions or aspect ratio to fit a specific screen, platform, or device. This process may include resolution adjustment, cropping the video, or changing the format to optimize for different uses.

This post will guide you through two simple methods to resize MP4 videos, helping you easily adjust the dimensions and aspect ratio of your MP4 files to make them look professional on every platform.

Method 1: Resize MP4 with MiniTool MovieMaker

MiniTool MovieMaker is designed to be an easy-to-use video editor to help everyone, especially beginners, create videos from images in minutes. This application provides various tools and effects to help you create professional-looking videos for different platforms.

Whether you need to resize MP4 files, change their aspect ratio, adjust playback speed, create picture-in-picture effects, make video collages, edit 4K footage, apply trendy filters, or add bubble text, MiniTool MovieMaker can meet your needs.

Best of all, MiniTool MovieMaker is a watermark-free video, leaving no branding logos on your final result to ensure clean results.

Here’s how to resize an MP4 video using MiniTool MovieMaker.

Step 1: Download and Install

Click the button below to download and install the MP4 resizer on your computer.

MiniTool MovieMakerClick to Download100%Clean & Safe

Step 2: Choose an Aspect Ratio

After opening the application, you can see the aspect ratio is set to 16:9 by default, which is the standard ratio for YouTube and most online videos on a desktop monitor. To change it, expand the Aspect Ratio menu and choose 9:16, 4:3, or 1:1 from the dropdown.

• 9:16: TikTok videos, Instagram Reels/Stories, Facebook Reels/Stories, etc.
• 4:3: widely used in film and TV.
• 1:1: Instagram fees videos.

Then, click the New Project button to enter the main interface.

Step 3: Import Your MP4 Video

Click the Import Media Files button to add the target video from your computer and add it to the timeline.

If you don’t change the aspect ratio before uploading the video, you can alter it now. Click the 16:9 option under the player window and choose the desired ratio.

Step 4: Crop the Video

Then you might find black bars on the top, bottom, right, or left of the video. This is because the aspect ratio of your video and canvas doesn’t match. To remove black bars, you can crop the video to the same aspect ratio.

Select the video on the timeline and click the Crop icon on the timeline toolbar. On the Crop window, expand the Ratio menu and choose the same ratio as your project. Next, resize the dragging handles and change the position to choose the area you want to save, and click OK to apply changes.

Step 5: Export the Video

Click the Export button in the upper right corner to open the Export window, where you can change the output format, resolution, frame rate, save path, etc. Click Export again to get the final result.

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Method 2: Resize MP4 with Microsoft Clipchamp

Microsoft Clipchamp is a great video editor built into Windows 11, equipped with a suite of features to empower content creators to make amazing videos. If you want to resize MP4 video files for free, it’s a fantastic choice.

Here’s how to resize an MP4 video with Microsoft Clipchamp.

Step 1: Launch the MP4 Video Resizer

If Microsoft Clipchamp is already installed on your PC, open it from the Start menu. If not, get the program from the Microsoft Store.

Step 2: Add Your MP4 File

Access the main interface by clicking the Create a new video button at the top. Then, you can add your MP4 video by clicking the Import button. Drag and drop the MP4 file to the timeline.

Step 3: Resize the MP4 Video

Option 1: Modify the Aspect Ratio

Without the clip being selected, click the Size icon, and click the desired aspect ratio, 16:9, 9:16, 1:1, 4:3, 4:5, 21:9, or 2:3.

Then, if black bars appear on the video, first click the clip on the timeline, click the Fit icon, and then click the Fill option.

Option 2: Crop the MP4 File

Highlight the clip on the timeline, click the Crop icon on the top floating bar, and you’ll see the cropping handle on top of the clip. Drag any side or apex of the handle to crop the video, and click the Done icon to save changes.

Step 4: Export the MP4 File

Click the Export option and choose a resolution to start exporting the resized MP4 file.

Conclusion

If you want your MP4 video to be everywhere, you should master the ability to resize MP4 files. With the two excellent programs, you can easily adapt your MP4 video for different platforms, screens, or devices.