AI Upscale to 4K

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Enhance and sharpen low-res images to 4K using AI super-resolution (RealESRGAN). Not basic upscaling — reconstructs real detail.

How to use AI Upscale to 4K

  1. Upload your image using drag & drop or click to browse.
  2. Adjust the settings using the controls above.
  3. Click "Apply AI Upscale to 4K" to process your image.
  4. Download your processed image as a PNG file.

About AI Upscale to 4K

Enhance and sharpen low-res images to 4K using AI super-resolution (RealESRGAN). Not basic upscaling — reconstructs real detail. This tool is part of ImageToolbox's collection of free online image tools.