How to Upscale Any Video to 4K Using AI for Free
Upscale Any Video to 4K with AI
Most AI-generated videos come out at 480p or 720p. RealESRGAN AI can upscale them frame-by-frame to near-4K quality — sharpening detail, reducing noise, and dramatically improving the final output. Here's how.
How AI Video Upscaling Works
RealESRGAN processes every single frame of your video independently using AI-trained on high-resolution imagery. It reconstructs detail that wasn't visible in the lower-resolution version, producing output that looks like it was natively generated at higher resolution.
- 2× upscale: 480p → 960p, 720p → 1440p — 1 credit
- 4× upscale: 480p → 1920p, 720p → near-4K — 2 credits
Step-by-Step Guide
Generate your video first
Create any video using Image to Video, Text to Video, or Premium Video tabs. Copy the video URL from the result.
Go to Upscale tab
Click the ⬆️ Upscale tab. Paste the video URL or upload the file.
Choose 2× or 4×
Select your upscale factor. 4× for best quality, 2× for faster processing at lower cost.
Download the upscaled video
Processing takes 1-5 minutes. Download your high-resolution video file.
When to Upscale
- Before sharing on YouTube — higher resolution = better compression
- Before using in professional projects
- When printing or displaying on large screens
- After creating AI video that came out lower resolution than expected
Related Articles
- A more in-depth guide to upscaling AI video to 4K without losing quality
- What actually determines AI video quality, beyond resolution alone
- A full review of Veo 3's native video quality and audio capabilities
- How Veo 3 and Kling 3 compare head-to-head on output quality
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