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UpscayljdPixelUpscaler
Free

Free and open source under the AGPL. There is no paid tier and no per-image cost.

 Free

Free and open source under GPL-3.0-only.

Windows, macOS, Linux Linux
  • Runs entirely on your own machine, so no images are uploaded anywhere
  • Batch processing for whole folders
  • Preserves solid pixel blocks when enlarging images
  • Includes command-line arguments and a D-Bus interface
  • Needs a Vulkan-compatible GPU; the project warns many integrated chips will not work
  • Slow on weaker hardware, and memory-hungry on large images
  • Does not account for neighboring pixels or image transitions
  • Linux only
Downloadable app Downloadable app
Open source Open source
License: AGPL-3.0 License: GPL-3.0-only
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.