How does AI image upscaling work and which tools give the best results?

AI upscaling uses deep learning models trained on millions of image pairs to predict and reconstruct missing pixel detail when enlarging an image. Unlike traditional bicubic interpolation which just blurs, AI models can recreate realistic textures like hair strands, fabric weave, and foliage.

Topaz Gigapixel AI is the industry standard for photo upscaling. It can enlarge images up to 600% while preserving or enhancing fine detail. It is a desktop app for Windows and Mac sold as a one-time purchase. Professional photographers and print shops use it as their default upscaling tool.

Upscayl is completely free and open-source and runs locally on your machine with no upload required. It uses ESRGAN-based models and produces results very close to Topaz for most images. It is the best option if you want high quality upscaling at zero cost with full privacy.

Adobe Photoshop has a Super Resolution feature inside Camera Raw that uses AI to quadruple the pixel count of an image while keeping edges sharp. If you already have a Creative Cloud subscription this is the most convenient route since no extra application is needed.

For video upscaling, Topaz Video AI is the equivalent tool. It can upscale old footage from 480p or 720p up to 4K using temporal AI models that analyze multiple frames at once to produce smooth and detailed results. It is widely used in film restoration and is the highest quality option available for video.