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Martinezipo's avatar
Martinezipo
Iron Contributor
Feb 07, 2026

How can I upscale image free to 4k using ai tool on a pc?

Looking for a free AI image upscaler that can enlarge pictures to 4K resolution on Windows 11 with good quality. Basic resize tools often cause blur and loss of detail, especially for photos and scre...
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Josew's avatar
Josew
Silver Contributor
Feb 08, 2026

Upscayl is a free open-source local AI image upscaler with an intuitive UI, enabling you to upscale image to 4k efficiently via local GPU acceleration—no complex setup, no cloud uploads, perfect for casual users.

How to upscale image to 4K

  1. Download the installer package for your system from GitHub. Launch the application directly after installation—no additional configuration is required.

  2. Drag images onto the main interface. Select “Single Image” for individual processing or click “Batch Upscale” to import a folder for batch processing.

  3. Choose an appropriate model, set the upscaling factor to 4x, and select the output format and save location.

  4. Click the Upscale button. The software utilizes GPU processing locally. After completion, capture the output folder.

Cons

  • Supports only image enlargement without video processing, resulting in relatively limited functionality.

  • When processing large-sized or batch images, low-end GPUs may experience lag and increased processing time.

  • Limited reproduction of complex texture details, with blurring or artifacts appearing in certain scenarios.