Cupscale review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Cupscale is an open-source desktop application for enlarging images with ESRGAN-based upscaling. It is aimed at Windows users who want more control than a basic image resize tool provides, including configurable models, processing backends, and multi-step workflows. The application runs locally and is distributed as a portable executable. Supported input formats include PNG, JPEG, BMP, WEBP, TGA, and DDS, while the published category specifications list AI upscaling, batch processing, and a desktop app.

Its main strength is workflow depth. Cupscale can upscale directories or multiple images in a batch, automatically tile and merge images, and apply pre-processing and post-processing resizing. On-the-fly model interpolation and model chaining give users additional ways to shape an ESRGAN workflow. Clipboard image input and side-by-side or animated comparisons also make it suited to iterative image evaluation. CUDA, Vulkan/NCNN, and CPU backends broaden its hardware options, although the practical choice depends on the Windows system and available backend support.

Cupscale is a good fit for Windows users who want a free, open-source tool with detailed ESRGAN controls, batch work, and local processing. It is less suitable for users who need a cross-platform application, a straightforward cloud workflow, or enlargement beyond the listed 4x maximum scale. Its portable format can simplify distribution, while the number of processing options makes it more appropriate for people who value configuration over a minimal interface. Users focused on occasional, simple resizing may prefer a narrower tool; users managing repeatable image-upscaling workflows will find Cupscale's feature set more relevant.

Cupscale pros and cons

• Where it wins
  • Supports batch processing, model chaining, and model interpolation
  • Offers CUDA, Vulkan/NCNN, and CPU processing backends
  • Includes tiling, resizing, clipboard input, and comparison previews
• Where it doesn't
  • Runs on Windows only
  • Maximum scale is 4x
  • Workflow depth may exceed the needs of simple one-off enlargements

Cupscale fact sheet, pricing and score →

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Last updated 7 Oct 2026 · How we research and update