Grid Overlay Pro – Visualize responsive grid layouts on any webpage

Summary: Grid Overlay Pro is a browser extension that overlays customizable, responsive grid systems on webpages to help designers and developers verify pixel-perfect alignment across screen sizes. It adjusts column widths and spacing automatically with viewport changes, maintaining consistent proportions.

What it does

The extension lets users create custom column grids with specific gutters and margins, configure multiple breakpoints, and toggle overlays via keyboard shortcuts. It saves grid settings as presets for repeated use.

Who it's for

It is designed for designers and developers who need to visually verify grid alignment and responsive behavior directly in the browser.

Why it matters

It eliminates the need to constantly switch between code editors, browsers, and inspectors to check grid alignment and responsive layouts, streamlining the design-to-code workflow.