Layout Grid Visualizer is a free Chrome extension designed for web developers and designers to enhance their grid layout visualization. This tool allows users to overlay a customizable grid on any webpage, making it easier to debug and perfect responsive layouts. Key features include adjustable grid settings for width, number of columns, gutter size, and color, as well as a split grid mode for creating non-uniform layouts. Users can interact with the grid overlay or navigate it using keyboard shortcuts for precise positioning.

The extension is optimized for performance, ensuring efficient updates and storage. It also offers features like persistent overlay positions per tab, auto-correction for invalid values, and instant feedback for real-time adjustments. With a focus on accessibility, it is fully navigable using a keyboard. Layout Grid Visualizer is a powerful addition for anyone looking to streamline their web design process without the need for code modifications.