Image Upscaler 4K is a dual-engine AI image upscaling platform. Get fast 4x enlargement in 3 seconds with Recraft Crisp, or use five specialized Topaz AI models for professional-grade results. Supports portraits, product photography, old prints, documents, and AI-generated artwork. Features adjustable sharpness, noise reduction, face enhancement, and batch processing up to 50 images. Output resolution up to 16,384x16,384 pixels with lossless PNG downloads.