ShrinkAgent screenshot

We have released ShrinkAgent (縮小担当), a free macOS app for batch image resizing.

Drop images or folders onto the window and they're instantly resized and saved — no dialogs, no extra steps. Inspired by the classic Windows utility 縮小専用.

Key features

  • Drag & drop or Cmd+O to add images
  • Long-edge size presets (640 / 800 / 1280 / 1920 / 2560 px) or custom value
  • JPEG quality slider (0–100%)
  • Output format: Keep original / JPEG / PNG
  • EXIF & GPS metadata stripping (default) or preservation
  • Multi-core parallel processing

Requirements

  • macOS 14 Sonoma or later
  • Developer ID signed & notarized

Download

Full details and download on the ShrinkAgent page.