AltSnap review
A free, open-source Windows utility for mouse-driven window control and saved layouts.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
AltSnap is an open-source Windows utility for moving, resizing, and snapping windows with mouse and keyboard actions. It is aimed at Windows users who want more direct control over window placement without carefully targeting title bars or borders. The basic interaction uses Alt+left-click to move a window and Alt+right-click to resize it, while Aero-style edge and corner snapping and saved custom layouts cover repeat placement needs. Its free, open-source distribution suits people seeking a utility rather than a paid window-management suite.
AltSnap’s feature set reaches beyond basic snapping: users can configure mouse actions, apply transparency while moving or resizing, and manage window blacklists and application-specific exceptions. It supports multiple monitors and integrates with Microsoft PowerToys FancyZones, which makes it a fit for users who already organize windows with that tool. Portable releases are also available. The combination favors users willing to tune behavior, rather than those looking only for a minimal snap toggle.
The main trade-off is platform and scope. AltSnap is for Windows, and its documented capabilities center on mouse-driven movement, resizing, snapping, and layouts. It is not a fit for someone looking for macOS or Linux support, or who needs documented virtual-desktop controls or application placement rules. Choose it for configurable mouse control and saved layouts at no cost; choose another option if those undocumented workflow controls or cross-platform coverage are essential.
AltSnap pros and cons
- Where it wins
- Move or resize windows with Alt-click instead of precise border targeting.
- Save custom snap layouts and use Aero-style edge and corner snapping.
- Supports multiple monitors and Microsoft PowerToys FancyZones integration.
- Where it doesn't
- Windows only; it does not serve macOS or Linux users.
- Configuration options and blacklists may be more than basic snapping requires.
- Does not provide documented virtual-desktop controls or app placement rules.
AltSnap fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update