A browser extension to visualize grid layouts on any webpage
Grid Overlay Pro is a browser extension that helps designers and developers ensure pixel-perfect alignment by overlaying customizable grid systems on any webpage. Unlike static design tool overlays, it features responsive grid adaptation—automatically adjusting column widths and spacing when the viewport resizes, maintaining consistent proportions across any screen size.
Grid Overlay Pro helps frontend developers and UI/UX designers verify spacing and alignment when implementing design systems. The tool supports px, rem, em, vw, vh, and % values plus CSS functions (calc, clamp, min, max), enabling precise validation of design system compliance across projects.
Grid Overlay Pro displays customizable grid overlays directly on any webpage, allowing developers to check alignment, spacing, and responsive breakpoints without affecting page functionality. Users can toggle grids on/off with keyboard shortcuts and adjust columns, gutters, margins, and opacity to match design specifications.
The extension runs entirely locally in the browser with zero data collection or transmission, and has no impact on page performance or functionality. It works seamlessly across localhost, staging, and production environments, making it ideal for teams maintaining visual standards.
The extension supports defining and testing multiple responsive breakpoints (mobile, tablet, desktop) with automatic switching. Users can save quick presets for different projects and configurations, enabling rapid verification that layouts match specifications at each breakpoint.