Changing the aspect ratio can fix this problem by ensuring the video displays correctly on modern screens, whether you’re aiming for the classic 4:3 ratio (standard definition) or the widescreen 16:9 ratio (high-definition). On Windows, there are several tools to help you correct this issue. Below, we’ll cover three of the best methods to adjust a video’s aspect ratio, along with a bonus tip for creating DVDs in 4:3 or 16:9.

Part 1. Why Aspect Ratio Matters

The aspect ratio defines the proportional relationship between a video’s width and height. The two most common ratios are:

• 16:9 – Used by most HD and 4K content (modern TVs, streaming platforms, and YouTube).
• 4:3 – The standard for older television broadcasts, DVDs, and camcorder footage.

When a video is saved or encoded with the wrong display aspect ratio (DAR), it can look distorted. Instead of re-shooting or discarding the footage, you can correct the aspect ratio using software. Some tools let you adjust it without re-encoding (quick and lossless), while others require re-encoding (slower but allows resizing or reformatting).

Here are the three easiest ways to change a video’s aspect ratio on Windows.

Part 2. Change Aspect Ratio Without Re-encoding Using Clever FFmpeg-GUI

Clever FFmpeg-GUI is a lightweight, portable tool for Windows (supports x86 and x64) designed to make FFmpeg more accessible. It allows users to change the aspect ratio (DAR) of a video without re-encoding, which is faster and prevents quality loss. The tool also handles audio and video streams separately, supports muxing, stream extraction, and many other features, including crop detection and subtitle management.

Key Features of Clever FFmpeg-GUI

• Change aspect ratio (DAR) without quality loss.
• Works with MP4, MKV, AVI, and more.
• Automatic detection of audio/video/subtitle streams.
• Video and audio processing (fade-in/out, pitch changes).
• Portable (no installation required, only needs .NET 4.8 and FFmpeg).

Steps to Fix a Stretched Video to 4:3

1. Install and Set Up the Tool

Download Clever FFmpeg-GUI and extract it. On first launch, set the FFmpeg path and output folder.

2.Load the Video

Drag and drop your video into the program or use the “Load” button.

3.Change the Aspect Ratio (DAR)

Click Main Page → Various → Change DAR. Enter your desired ratio:  1.33 for 4:3 or 1.77 for 16:9 , Click Change.

Find Your Corrected Video

The new video will be in your output folder, now displaying correctly without re-encoding.

This method is the fastest and doesn’t degrade quality, as no re-encoding occurs. However, it only changes the display aspect ratio; it won’t rescale the video’s resolution.

Part 3. Re-encode and Resize Video Using VidCoder

VidCoder is a user-friendly video converter for Windows that uses the HandBrake engine. It allows you to manually set the width and height of your video, effectively changing its aspect ratio. Unlike Clever FFmpeg-GUI, VidCoder re-encodes the video, which takes longer but gives you full control over output resolution and compression.

Key Features of VidCoder

• Converts DVD, Blu-ray, and video files to MP4, MKV, or WEBM.
• Supports H.264 and H.265 encoding (x264/x265).
• Burn-in or hardcode SRT subtitles.
• Multi-threaded encoding for faster performance.
• Integrated process (no large temporary files).
• Requires .NET 6 Client.

How to Convert a 16:9 Video to 4:3 in VidCoder

1.Open VidCoder and Import Your Video

Launch the program and load your file.

2.Adjust the Aspect Ratio

Go to Video Settings → Sizing. Set Mode to “Manual.” Manually adjust the Width and Height to fit your target ratio. For 4:3, you can set the resolution to 640x480 (or a similar scale).

3.Start Encoding

Set the output folder and filename. Click Encode to generate a new video with the corrected aspect ratio.

VidCoder is ideal when you need to rescale or compress the video, not just adjust its display aspect ratio. It’s also useful if you want to output to different file formats like MP4 or MKV.

Part 4. Adjust Dimensions and Encode Using HandBrake

HandBrake is one of the most popular open-source video transcoders, available on Windows, macOS, and Linux. Like VidCoder, it re-encodes your video but offers more granular control over dimensions, scaling, and anamorphic settings.

Key Features of HandBrake

• Supports DVD, Blu-ray, and most multimedia files.
• Outputs MP4 and MKV formats with H.264, H.265, VP8, VP9, and Theora.
• Multiple audio track and subtitle support.
• Adjust anamorphic scaling and dimensions.
• Free and open source.

How to Change a Video from 16:9 to 4:3

1.Load the Video

Open HandBrake and drag your video into the interface.

2.Open the Dimensions Tab

Set Anamorphic to “Automatic.” Adjust the Scaled Size manually to match your target ratio. For 4:3, set it to 640x480. Adjust the Display Size if necessary to match the playback aspect.

3.Start Encoding

Set your output format (MP4 or MKV) and destination. Click Start Encode to process the file.

HandBrake is perfect for users who need precise control over scaling, compression, and encoding, while still supporting multiple audio and subtitle tracks.

Part 5. How to Create a 4:3 or 16:9 DVD

If your goal is to burn your corrected video to a DVD, you can use Yuhan DVD Creator (or similar software) to easily author discs in either 4:3 or 16:9 formats. Yuhan DVD Creator supports almost all video formats, including MP4, MKV, AVI, and MOV, and allows you to:

• Choose between 4:3 or 16:9 output.
• Add menus, background music, and custom chapters.
• Burn directly to disc, create an ISO file, or save as a DVD folder.

This is especially useful for users archiving old 4:3 camcorder footage or converting widescreen content into a playable DVD format for older TVs.

Steps to Create a 4:3 or 16:9 DVD

Before we start, we need to download and install Yuhan DVD Creator. If your computer is Windows, you can click the button on the left below to download it. If your computer is Mac, please click the button on the right below to download it.

Step 1: Add Video Files

After launching the software, click the "DVD" tab at the top to begin creating your DVD. Next, click "Add Video" to import the video files you want to burn. At the bottom of the window, you can customize essential settings such as disc capacity (DVD5 or DVD9), video aspect ratio (16:9 or 4:3), and choose between PAL or NTSC video formats based on your region.

Step 2: Select a menu template and customize it

Click the "Select Menu" button to open the "Menu Settings" dialog box. Here, you can browse the available templates on the right and customize them to your preference—such as setting a background image, adding background music, adjusting the position of menu items, and more.

Step 3: Output Settings

You can save your DVD assets as a DVD folder, an ISO image, or burn them directly to a disc. Additionally, you can configure settings such as the default audio track, default subtitles, disc label, and more to suit your preferences.

Step 4: Start authoring

Click the "Start" button to begin the burning process with Yuhan DVD Creator. Once the process is complete, the disc will be automatically ejected.

Part 6. Conclusion

Changing the aspect ratio of a video on Windows doesn’t need to be complicated. Whether you’re fixing a stretched video or converting footage for a specific display, there are three main approaches:

• Clever FFmpeg-GUI lets you quickly fix aspect ratios without re-encoding, preserving quality.
• VidCoder  and HandBrake  offer simple manual resizing and re-encoding for custom resolutions and provide professional-grade scaling and encoding options with support for multiple codecs.

For users creating DVDs, Yuhan DVD Creator makes it easy to produce 4:3 or 16:9 discs with menus, ensuring your videos play correctly on any player.

By using these tools, you can eliminate stretching and distortion, making your videos look professional and enjoyable on any screen.

If you want to learn more about Yuhan DVD Creator, please click: https://yuhanmedia.com/dvd-creator

If you want to download and try it for free, please click the button below to download it.