Orphan Pixel Corrector is a simple and easy to use graphics tool that help you to detect/fix orphan pixels from pixel art images.
https://huhmiel-games.github.io/orphan-pixel-corrector/
Mouse Scroll: Scroll Y
Shift + Mouse Scroll: Scroll X
Ctrl + Mouse Scroll: Zoom
Mouse Left Button: Pick Color
Ctrl + Mouse Left Button: Paste Color
Ctrl + Z: Undo
Ctrl + Y: Redo
Ctrl + S: Save
Enjoy...