AltSnap

What AltSnap is

AltSnap is a free GPL-3.0 Windows utility for moving, resizing, and arranging desktop windows. Holding Alt while clicking a window lets users move or resize it, while snapping places windows against screen borders or other windows with configurable thresholds. Users can create custom snap layouts, extend windows across zones, and enable grid mode. Configuration supports activation hotkeys plus actions assigned to mouse buttons or keyboard shortcuts. The project also lists transparent window dragging, pause-process options, and blacklists that disable move, resize, or scroll actions for selected programs. AltSnap zones can be set up to match Microsoft PowerToys FancyZones, with a restore option for FancyZones-snapped windows. The maker says the utility injects nothing into other applications and removed the original hooks feature because it required DLL injection. Builds are documented for 32-bit, x86-64, and ARM64 Windows; ARM64 builds are noted as untested. The project is oriented toward Windows NT 4 through Windows 11, with most testing reported on Windows XP and Windows 10. Hooks windows and focus-on-typing features are removed or disabled in this fork. The Free plan is free.