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All Things You Need to Know about 4K Upscaling

Over the years, the image and video quality has been evolved remarkably, with 4K resolution now taking the lead to deliver a notably pristine experience, especially on widescreen UHD TVs. Not 4k content is available anywhere, whether you are taking a shoot with your action cam, streaming over YouTube, watching on your 4K TV, or play 4K Blu-ray of blockbusters at home.

Despite 4k coming on like gangbusters, 1080p still plays the leading role, for sometimes the prevalence takes far longer than does the creation. This can lead to a common predicament: you've purchased a 4K TV but only had 1080p videos to play on. Why not try to upscale HD video to 4K for optimal viewing on 4K TV? This article will let you have a deep understanding of 4K upscaling and guide you how to upscale 1080p to 4K easily.

Related Post: How to upscale video from low resolution to high resolution 4k >>

Free Download 4K Upscaler to Enhance Video Quality on Your 4K TV

Winxvideo AI - A professional 4K video upscaler, which adopts unique upscaling algorithm and allows you to AI upscale 1080p to 4K, DVD to 4K, 4K to 8K with nearly no loss of quality at all for playback on 4K TV in higher resolution. Super resolution, stabilization and frame interpolation jointly create a crisp video for you!

Table of Contents

Part 1. What Is 4K Upscaling? How Does It Work?

To know much more about 4K upscaling, you'd better know what is 1080p and 4K resolution. A 1080p video has 1920 horizontal pixels and 1080 vertical pixels, while a 4K video has 3840 horizontal pixels and 2160 vertical. If you're playing 1080p on a 4K TV without upscaling, you only only see a quarter of the frame on the screen.

What Is 4K Upscaling?

Upscaling means that the resolution of a video is increased by a scheme for better quality and playback on higher resolution screen. 4K upscaling, for example, involves in the process of converting low-resolution video to 4k resolution. For instance, you can upcsale DVD (480p) to 4k, upconvert 720p/1080p to 4K reoslution.

How Does 4K Upscaling Work?

To get 1080p video all over the 4K screen, you definitely need to upscale 1080p HD video to 4K resolution. Traditionally, there are three ways to do that: nearest neighbor interpolation, bilinear interpolation and bicubic interpolation. And now with technogy moving on, you can expect more advanced algorithms such as the SRCNN to do the 4k upscaling tasks. Here are the examinations.

1. Nearest neighbor interpolation: Also called point sampling, is the easiest and most widely-used method for 4K upscaling. It determines the new interpolated pixel by the nearest neighbor point in the input vector or matrix instead of calculating the value by any weighting criteria or complicated rules. But in this way, it has a lot of blurriness and articfacts.

Nearest neighbor interpolation

2. Bilinear interpolation: Bilinear interpolation is implemented in both X and Y directions, which used the distance-weighted average of 4 nearest known neighboring pixel points to determine the new pixel value. Though bilinear interpolation is better than neighbor interpolation, it still has visible artifacts and blurring.

Bilinear interpolation

3. Bicubic interpolation: In this way, the interpolated pixel is calculated as the weighted average of 16 (4 x 4) nearest neighboring points. It's more complicated than the other two 4K upscaling methods. But relatively, it generates more fine details, which makes the image video smoother visually. Programs like Adobe Photoshop and Corel Photo-paint use Bicubic interpolation as the standard.

Bicubic interpolation

4. SRCNN: SRCNN is short for Super-Resolution convolutional neural network, which applies a series of convolutional layers to extract and process features from the source video or image, and therefore allows network to generate higher-resolution 4k content with more detail.

In addition to the above mentioned upscaling algorithms, there are some others such as Lanczos interpolation, and SRGAN. The latter relies on a generator to take a low-resolution content as input and produce a super-resolved one as output, and further uses a discriminator to distinguish betwene the generated content and the real high-resolution content, in such way to produce a truly high-quality 4k video with improved texture and sharpness.

After 4K upscaling, you definetely get an enhanced video quality compared with original HD videos. But it's not good enough with real 4K contents, for example, the upscaling 4K video doesn't have the 4K HDR effects.

Part 2. Why Do You Need Upscale Video to 4K?

The desire to upscale video to 4K can be driven by the aspearing for better image quality and the widespread availability of more 4k-capable devices such as 4K TV. However, the problem is that no all the videos you have are originally in 4K resolution. For a long time in the past, you can only shoot videos up to 1080p, and many of us downloaded HD contents from platforms like Netflix, YouTube or the like. On the other hand, even though many manufacturers claim that their TVs are true 4K, there are still many fake ones, which are tested with bad upscaling performance when playing HD videos.

Nevertheless, if the 4K TV cannot upscale video to 4K properly, you can also try to manually upconvert 1080p to 4K with a professional 4K video converter and upscaler.

Part 3. Best 4K Upscaling Software

#1. Winxvideo AI

As mentioned, Winxvideo AI allows you to upconvert 1080p to 4K easily with high quality reserved. Besides, it also behaves well on converting 4K videos and basic video editing.

  • AI Convert HD/4K videos to MP4, MOV, AVI, MKV, FLV, Apple TV, Xbox, PS4/5, iPhone iPad, Android and more.
  • Reduce video file size by up to 90% without obviously video quality loss visually.
  • Flexible adjust video parameters, such as AI upscale 1080p to 4K, 720 to 1080p, 4K to 2K, 60fps to 30fps, change bit rate, aspect ratio etc.
  • Edit video as you need: trim video length, crop video frame size, merge video, rotate or flip video.

#2. Topaz Video AI

Topaz Video AI has been highly praised for its superb upscaling quality and user-friendly interface. By utilizing artificial intelligence, Topaz Video AI intelligently guess what the new pixels in the higher resolution should look like and therefore transforms low-resolution video into stunning 4k and even 8K with much detail and sharpness. You can even fine-tune settings to further redcue video noise and artifacts. Besides 4k upscaling, Topaz also allows to stabilize shaky footage, remove motion blur, boost frames to make video smooth, and so on.

It's worth noting that the upscaling process can be relatively time-consuming compared with other video upscaling tools, even when you are equipped with powerful GPU and CPU. But despite the potential drawback in speed, the exception quality of the upscaled video make it worthwhile for those seeking for a good 4k video upscaler.

What We Like?

  • The quality of the video upscaled is high, with more details and clarity.
  • Various video quality enhancing modes.
  • Support 4k/8k upscaling.
  • The interface is intuitive.

What We Dislike?

  • The speed of preview, upscaling and exporting is very slow.
  • High computer system requirement.

#3. AVCLabs Video Enhancer AI

AVCLabs Video Enhancer AI is particularly noteworthy when it comes to upscaling video. With it you can upscale your low-resolution low quality video by 400X or directly upconvert video to 4k or even 8K. Like other video enhancer tools, AVClabs is packed full with additional features. For example, the frame interpolation enables you to boost your video to 60fps/120fps for smoother viewing experienc. Video colorizer helps to revive your old black-and-white memories with a splash of color and give more control over the brightness, contrast, etc. Additionally, face restoration is purpose-built to diminish pixelation or blur and bring back more details to your face.

AVClabs Video Enhancer AI sets apart Topaz Video AI lies to its balance between quality and speed. The 4k upscaling process is relatively efficeint in our test. This is particularly advantageous when you are going to work with multiple projects. Its AI-driven upscaling, speed, and more features make it a good choice for anyone seeking to enhance video quality.

What We Like?

  • Relatively faster export speed.
  • Decent facial optimization.

What We Dislike?

  • Slower installation speed.
  • Initial startup can be problematic.
  • High computer system requirement.

Steps to Upscale 1080p to 4K with No Quality Loss

All the 4k upscaling software mentioned above open up a word of possibilities for anyone who need to upscale low-quality video to higher resolution up to 4K. The choice depends on the cost, how simple it is to use, specific features, the level of control you desire, and the hardware at your disposal.

Here we will show you how to upscale video resolution from 1080p to 4K with Winxvideo AI on Windows 10 PC. To get started, please download and install the software firstly on your computer. After the installation, open it and do as the following steps suggest.

Step 1. Load 1080p video
Click "+ Video" button to load your source 1080p videos. Also you can just drag and drop the video to get it loaded. Batch conversion is allowed as well.

load your 1080p video file

Step 2. Change resolution to 4K
There are two ways for your 4K upscaling:
1. When the window of Output Profile pops up automatically, choose "4K MP4 Video" under "General Profiles"
2. Or choose any format you prefer, click OK to get back to the main interface, and then click the gear icon to get into the Video parameter center. Find "Video Resolution" and choose 3840x2160 from the dropdown list.

upscale video to 4K

Step 3. RUN the 4K upscaling
Set a destination folder and then press button "RUN" to upconvert 1080p HD to 4K.

Click to see the best video resolution changer >>

More Detailed Tutorial on YouTube: How to Upscale 1080p to 4K with High Quality

Part 4. FAQs about 4K Upscaling

Q: Does 4K upscaling really work? Is 1080p upscaled to 4K really better?

"I've been tempted to buy my Dad a new 4K flat screen around 70 inches. Does the upscaling really work well on 4K televisions? I remember a lot of the HD sets bragging about upscaling 7 or 8 years ago when they were starting to hit the market, but they really didn't make DVDs look any better from the 480p they were encoded at."

A: Generally, the results of 4K upscaling can be summarized in two lines as follows, if we watch a same source video on a same-size screen at a same distance. But note that still they are not 100% correct because of the different upscaling algorithms methods adopted by different TV sets, converter software, players, etc, which will be explained in the answers for Q3.

  • 720p downscaled from 1080p < 1080p ≤ 1080p downscaled from 4K < Blu-ray 1080p
  • Blu-ray 1080p ≤ 4K upscaled from 1080p < native 4K ≤ 4K downscaled from 8K/10K

Q: What matters for 4K upscaling on TV?

A: 4K sources are vastly popular yet so you need to make sure you have got 4k sources down the line. Then an Ultra HD Blu-ray Player or 4k set-top box is in demand. The UHD Blu-ray players have a bitrate of 128Mbps and can output 4k content. A TV with HDCP 2.2 is needed to play from UHD Blu-rays.

As you can see, unlike the past, 4K upscaling is not all about bragging and marketing gimmick. It really works. 1080p can be upscaled to 4K and does look sharper. But that's it. There is improvement but miracles won't happen. 4K upscaling can't equal to True 4K. The picture quality after being upscaled to 4K is, at best, crystal clear than standard 1080p, and at worst, comes with weird grainy texture, looking even worse than before. This is decided by the 4K upscaling tools you use.


author - Donna Peng

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Donna Peng's fascination with multimedia began at an early age - shortly after she licked the physical disc and then she's been obsessed ever since. Her decade-long career at Digiarty after the graduation has seen her unmatched expertise in the field of DVD, digital video, software and anything related to home theatre. She is currently fascinated with photography.

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