Chrome Extension Toolbar Icon Previewer is a free add-on designed for Chrome developers, enabling them to upload and preview 32×32 icons for their extensions with ease. The tool features real-time previews in a simulated Chrome toolbar environment, allowing developers to see how their icons will appear to users before publishing. Key functionalities include drag-and-drop uploads, automatic resizing for non-standard dimensions, and customizable border options to enhance visibility against various backgrounds.

This extension streamlines the development process by eliminating the need for repetitive testing methods. Developers can instantly view changes and make adjustments, ensuring their icons are visually appealing and functional. With local storage for custom icons and a detailed full-page preview, this tool is essential for anyone looking to improve the branding of their Chrome extensions.