How to Upscale Video to 4K | Best 4K Video Upscalers [2025]
- Last updated on 2025-04-22
Table Of Content
Introduction
You can't make the most of your high-end 4K device unless you have enough 4K content to watch. So, if your saved videos, such as movies, homemade videos, social media downloads, etc., are not available in 4K, it's time to know how to make a video 4K using the most effective and authentic video upscaler. So, let's take a quick glance at what 4K is and how to upscale a video to 4K.
What is 4K Resolution?
In the term 4K resolution, the term 4K means how many tiny dots or pixels are in a particular area, measured by pixel per inch (ppi). The resolution means how densely these pixels are put together in every inch of the display screen. Now, 4K has 3,840 pixels (horizontal) × 2160 pixels (vertical); therefore, it comes to around 8.3 million pixels. Here, the “K” means Kilo(1000). So, 4K refers to approximately 4000 horizontal pixels of your device's display screen.
How Does 4K Upscaling Work?
As you know, 4K resolution means almost 8.3 million pixels. Therefore, if your video is in lower resolution, you must add more pixels to it to upscale it to 4K resolution to match the standard pixel amount in 4K. To do this, what is commonly done in the traditional video upscaling process is to interpolate new resolution in the grapes of existing resolution.
Multiple-pixel interpolation methods, such as Nearest neighbor interpolation, Bilinear interpolation, Bicubic interpolation, Lanczoc interpolation, etc., have been used traditionally to upscale video to 4K. Apart from this, many other algorithms, such as SRCNN and SRGAN, have been used for video upscaling.
However, suppose you don't want to learn all of these complicated video upscaling methods. In that case, the machine learning algorithm of AI-Upscaler is the best option for upscaling any video from any poor resolution to 4K without needing any video upscaling skill or experience.
Two Tools to Upscale Video to 4K [Windows & Mac]
1. UniFab Video Upscaler AI
With AI automation, UniFab Video Upscaler AI lets you upscale any video to SD, HD, 4K, 8K, or even 16K with one click. While upscaling video resolution, you can also enhance the video quality by sharpening, optimizing color, and restoring video details. So, let's see how to upscale video to 4K with ultimate customizable functions and flexibility.
Key Features
Universal Model: This dedicated model is designed to upscale and enhance any video by sharpening, optimizing color, and recovering details without data loss or distortion.
Animation Model: Unifab offers a dedicated Animation model to enhance any anime, cartoon, or motion graphic video while sharpening lines, clarifying minute details, and preserving artistic aesthetics.
Upgraged AI Model: The upgraded model now intelligently detects and corrects issues like compression artifacts, detail loss, noise, halo effects from over-sharpening, and jagged edges or blurriness.
Batch Processing: To save time, energy, and effort, UniFab lets you upscale multiple videos in one go with batch processing.
Flexible Customization: To get a custom output video profile, you can change and customize various parameters, such as codec, frame rate, bit rate, resolution, etc.
Pros
Upscale resolution up to 8K with video-enhancing support
Intuitive & user-friendly interface with powerful functions
50X faster GPU acceleration
Windows & Mac compatible tool
Efficient editing with cropping, trimming, cutting, etc
Fully automatic tool with maximum customization
30-day free trial without watermarks
Cons
Currently not supported on Linux
2. CapCut Video Upscaler
CapCut is another powerful AI-automated video upscaler that can upscale video from any low resolution to 4K with a simple interface and steps. With its AI algorithm, CapCut doesn't involve manual intervention or complicated steps for video upscaling. This fully automated tool is compatible with Windows and Mac and also has an online version.
Key Features
- Enjoy 4K upscaling with video sharpening and restoring video details
- Enhance & upscale video quality without distorting it's originality
- Using the AI algorithm, CapCut analyzes each frame & adds video details
- Versatile tool with different formats, resolutions, and context support
Pros
Perfect tool for personal & professional use
Exclusive video editing support
Access this tool through a web browser or use a dedicated app for desktop
Cons
The processing may lead to over-smoothing, causing an artificial look
CapCut adds watermark
This tool is not fully free
Best 4K Video Upscalers Compared [UniFab vs CapCut]
Basic Infomation Comparison Chart
| Product | Resolution Support | Best For | Price |
| UniFab Video Upscaler AI | Up to 16K | Creators looking for high-quality results with minimal effort. | 30-day free trial withour watermark Lifetime: $69.99 |
| CapCut Video Upscaler | Up to 8K | Casual users looking for a quick way to upscale videos. | Monthly: $19.99 Yearly: $179.99 |
Performance Comparison on Upscaling Video to 4K
When comparing UniFab and CapCut for 4K video upscaling, the difference in output quality is clear.
UniFab delivers highly detailed and natural-looking 4K videos. It restores fine textures like hair strands, skin pores, and eyelashes with remarkable precision, maintaining a realistic and clean aesthetic.
In contrast, CapCut tends to over-smooth facial features, often creating an artificial or plastic-like appearance. It may also apply excessive sharpening, causing delicate details like hair to appear over-processed or unnatural.
Verdict:
For professional-level 4K enhancement with realistic detail recovery, UniFab Video Upscaler AI is the superior choice.
How to Upscale Video to 4K with UniFab
30-day Free Trial with full feature access!
Open UniFab > click on 'All Features' > select the 'Upscaler' module. Then, select the “Add Video” option to upload the poor-resolution video that you want to upscale to 4K.
Now, customize the output video parameters such as resolution, model, quality, codec, format, and more as needed.
Click 'Start' option to begin the video upscaling process.
How to Upscale to 4K with CapCut
Download & launch the CapCut tool on computer > choose “Start Creating” to begin a new season > hit “Import” to upload the low quality video for upscaling.
After dragging the video into the timeline, you can adjust various parameters, such as effect, filter, transition, etc. Select the “Adjustment” option and drag it to the timeline.
You will see the “Adjustment” settings in the right panel > adjust the color, brightness, saturation etc > to improve video quality go for the “Sharpen” effect > move the slider depending on your requirements.
After all the settings customization select “Export” > a window will be opened with “Export” settings > in the resolution drop down menu select 4K as the export video quality.
You can also select the frame rate to 60fps. Next, select “Export” > the tool will start the video upscaling process up to 4K > save the upscaled video in the selected folder.
Conclusion
When you know how to upscale to 4K with AI automation, it's time to pick the right tool for your video upscaling process. While selecting the tool, you must pick the one with maximum flexibility, customization, and editing options to make the most out of your video upscaling experience. For doing the with ultimate satisfaction UniFab Video Upscaler AI is the best one.
FAQs about Upscaling Video to 4K
How to Upscale Video to 4K in 60fps?
Using UniFab Video Upscaler AI, you can upscale video to 4K at 60 fps. This tool lets you select the frame rate, resolution, bit rate, audio channel, etc. while upscaling and enhancing video quality.
Can I upscale 1080p to 4K without losing quality?
Yes, using AI upscalers like UniFab, you can actually enhance details while increasing resolution.
How to Upscale a Video to 4K Online for Free?
While several tools offer online upscaling, there are limitations you should be aware of: CapCut provides a free online video editor that supports basic video enhancement. However, its online version can only upscale videos up to 2K, not 4K. Full 4K upscaling is only available in its desktop app.