Layout Pest is a Chrome extension designed to aid web developers and designers by enhancing the visualization of page layouts. This tool adds colorful outlines around all HTML elements on any webpage, making it easier to inspect and debug layout issues. Inspired by the popular Pesticide extension, Layout Pest offers interactive hover effects to highlight specific elements, alongside a detailed tooltip that provides comprehensive information about each element, including its tag, ID, classes, dimensions, and CSS properties.

The extension allows customization of outline thickness and includes a badge indicator to show when it is active. It is particularly useful for frontend developers troubleshooting CSS, web designers verifying element spacing, and educators teaching HTML structure. Layout Pest is lightweight, has no impact on page performance when disabled, and operates entirely within the browser without collecting data or requiring unnecessary permissions.