LayoutLab

This Chrome extension adds a customizable overlay system to any webpage, including rulers, guides, columns, and grids to help you create pixel-perfect layouts with confidence. Whether you’re refining spacing, aligning components, or matching a design mockup, the overlay tools give you the visual structure you need without leaving the browser. Built for web designers and front-end developers, the extension makes it easy to inspect layout consistency, test responsive alignment, and fine-tune interfaces during development. Features - Draggable horizontal and vertical guides - Customizable column overlays - Responsive layout grids - On-screen rulers with pixel measurements - Toggle overlays on any webpage instantly - Designed for modern responsive workflows Perfect for: - UI and web designers - Front-end developers - Design QA and audits - Pixel-perfect implementation work - Comparing live sites against mockups Stop guessing spacing and alignment. Build cleaner, sharper interfaces with visual precision tools right inside Chrome.