What Is 4K and How to Convert, Upscale, or Downscale 4K Video

4K video can look sharp and detailed on a large TV or monitor. But it is worth knowing one thing first: converting a 720p or 1080p file to 4K is upscaling, not magic. It increases the resolution and can make playback fit a 4K screen better, but it cannot fully recreate details that were never captured in the original video.

That said, upscaling is still useful when a lower-resolution video looks soft on a 4K TV, when you want a 4K output for editing or sharing, or when you need to standardize a batch of videos. On the other hand, downscaling 4K to 1080p or 720p can reduce file size and make playback smoother on older PCs, phones, TVs, and media players. The following guide shows both workflows with WonderFox HD Video Converter Factory Pro.

Download and install the application (480p, 720p, 1080p to 4K converter) on your Windows PC.

Note: this software also supports compressing 4K (UltraHD) video.

Part 1: How to Convert or Upscale Video to 4K Ultra HD

Step 1. Add Source Video

Launch the software and select Converter. Click “Add Files” to import the video you want to convert to 4K. It can be a 720p, 1080p, 2K, or other common video file.

Tip: If you have multiple files, add them together. The batch conversion mode can upscale or convert several videos in one queue. You can also drag and drop files into the program directly.

Add Source Video

Step 2. Choose a 4K UHD Profile

Open the output format drop-down list on the right side. In the latest version, the “UHD” tab contains ready-made high-resolution profiles from 2K to 8K, including 4K MP4 AV1, 4K MP4 H.265, 4K MP4 H.264, 4K MKV AV1, 4K MKV H.265, 4K MOV ProRes, and 4K MXF. Select the one that matches your playback or editing needs.

Tip: MP4 H.264 is usually the safest choice for compatibility. H.265/HEVC and AV1 can be smaller but require newer playback support. MOV ProRes is more suitable for editing workflows, while MXF is often used in professional video production. If you want to keep a specific container like AVI or WMV, select it under the “Video” tab first. Then use “Quick setting” or “Parameter settings” to set the resolution to 4K manually.

Choose a 4K UHD Profile

Step 3. Adjust Settings and Convert Video to 4K

Before conversion, check the output resolution. If you choose a normal video format instead of a ready-made UHD profile, move the “Quick setting” slider to 4K or open “Parameter settings” to enter 3840 × 2160 manually.

You can also adjust the encoder, bitrate, frame rate, and aspect ratio. For example, H.265/HEVC can help control the size of a 4K file, while H.264 is often safer for older devices. If you need 4K 60fps output, set the frame rate in “Parameter settings”.

Finally, click the ▼ icon at the bottom to set an output folder, then click the “Run” button. 4K conversion can be resource-intensive, so closing unnecessary background apps and enabling available hardware acceleration can help keep the process smoother.

Convert Video to 4K

Should You Upscale 720p or 1080p to 4K?

If the original video is clean and detailed, upscaling it to 4K may look better on a 4K TV than playing the low-resolution file directly. 1080p sources usually upscale better than 720p because they contain more original detail.

However, a converted 4K file is not the same as native 4K footage. If the source is blurry, noisy, or heavily compressed, increasing the resolution will not truly fix those problems. In that case, use reasonable bitrate settings, avoid repeated re-encoding, and consider keeping a backup of the original file.

Now, please Download the HD Video Converter Factory Pro to complete your jobs.

Free Download

Also Read:Download 4K Video, Best HD Video Editor Reviews, SD Video to HD Video

Part 2: How to Convert 4K Video to 1080p, 720p, 480p?

4K/Ultra HD video is common today, but the files can be large and demanding. If your device cannot play 4K smoothly, you need to save storage space, or you want a smaller copy for sharing, converting 4K to 1080p or 720p is a practical choice. With WonderFox HD Video Converter Factory Pro, you can reduce the resolution while keeping a reasonable balance between quality and file size. Here is the step-by-step guide:

Free download and install the software before you start.

Step 1. Add Your 4K Videos

Launch it and open “Converter”. Import the 4K videos by clicking “Add Files” or directly dragging them to the interface. Batch import is supported if you want to process multiple 4K clips.

Step 2. Select the Output Format

Click the format image on the right to open the output options. Then, under the “Video” tab, select the desired video format. MP4 with H.264 is a safe choice for broad compatibility, while HEVC/H.265 can be considered when you want a smaller file and the target device supports it.

Downscale 4K Videos

Step 3. Drag the Resolution Bar to 1080p, 720p, etc.

Next, use the “Quick setting” bar to lower the video resolution to 1080p, 720p, or 480p. If you want more control, open “Parameter settings” and modify the resolution, bitrate, frame rate, and encoder as needed. Lowering bitrate can reduce size further, but setting it too low will make the video look blocky.

Step 4. Start the Video Conversion

Click the ▼ button to specify an output path. Now, click the “Run” button to begin the conversion.

Full-featured 4K Video Converter

HD Video Converter Factory pro is a powerful HD video converter that lets you convert video between 8K, 5K, 4K, 2K, 1080P, 720P HD, 480P and more. Moreover, it offers a built-in 4K video downloader and HD video editing tool.

Free Download

Compatible with Windows 11/10/8.1/7/...

More than a 4K Video Converter

4K video to web

I know some of you like sharing videos online. But it can be annoying to remember the best format, encoder, resolution, and bitrate for each platform. The preset profiles in HD Video Converter Factory Pro can help you prepare videos for common websites, devices, and HTML5 playback without manually checking every setting.

Over and above, HD Video Converter Factory Pro also works as an online video downloader, video editor, video compressor, screen recorder, and ringtone maker for iOS/Android.

Download online videos from many supported video-sharing sites and save them for offline playback when permitted.

Flexibly merge video clips into one. You can join clips in different formats and export one full-length video for easier playback or sharing.

Built-in HD video editing functions allow you to trim, crop, rotate, flip, add effects, add watermarks, and adjust audio volume before conversion.

Compress large 4K files by lowering resolution, changing codec, reducing bitrate, or using the built-in compressor when file size matters.

What Is 4K and What Does Upscaling Mean?

What Is 4K

4K resolution generally refers to video or display content with about 4,000 horizontal pixels. For most TVs, monitors, online videos, and consumer media, 4K UHD means 3840 × 2160 pixels. In digital cinema, 4K can also refer to 4096 × 2160 pixels.

Compared with 1080p Full HD, 4K UHD has four times as many pixels. Compared with 720p, it has sixteen times as many pixels. This is why 4K can look sharper on large screens, especially when the original video was shot or produced in true 4K.

Upscaling means increasing a video's pixel dimensions, such as converting 720p or 1080p to 4K. It can make a video fit a 4K display better and may reduce the softness you see when a low-resolution file is stretched on a large screen. But upscaling does not turn an old, low-quality source into real native 4K footage.

So, to get the best picture quality, use the right resolution for the right screen and purpose. Free Download WonderFox HD Video Converter Factory Pro to convert, upscale, downscale, or compress your videos more easily.

HD TV vs 4K TV

FAQs

Q1. Can I convert 720p or 1080p to true 4K?

You can convert the resolution to 4K, but the result is upscaled 4K, not native 4K. It may look cleaner on a 4K display if the source is good, but it cannot restore details that were not in the original video.

Q2. Is 1080p to 4K better than 720p to 4K?

Usually yes. A 1080p source contains more pixels and more original detail than 720p, so the upscaled result often looks better. A poor-quality 1080p file, however, may still look worse than a clean 720p file.

Q3. What format should I choose for 4K output?

MP4 is a safe choice for most TVs, phones, computers, and websites. H.264 offers wide compatibility, while H.265/HEVC can reduce file size if the playback device supports it.

Q4. Why should I convert 4K to 1080p?

Downscaling 4K to 1080p can make the file smaller, reduce playback lag, and improve compatibility with older devices while still keeping good visual quality for many screens.

Kevincy Berel

Kevincy joined the WonderFox team in 2014 and has been a senior columnist ever since. With over two decades of experience in the video editing industry, he shares tutorials, tips, and how-to guides on video/audio processing and personal DVD backups. Family-oriented and passionate about helping others, he is dedicated to making video and audio processing easier for readers.