HTML debugging tools are essential for web design, as they can help you avoid mistakes, save time, and guarantee compatibility across multiple browsers and devices. With HTML debugging tools, you can catch and correct errors before they cause problems for your visitors or clients. Additionally, you can improve your code readability and maintainability by following HTML standards and best practices. Moreover, these tools allow you to experiment with different code options and see the results instantly, thus enhancing your web design creativity and flexibility. Furthermore, HTML debugging tools can boost your web design performance and speed by identifying and eliminating unnecessary or redundant code elements. Finally, they can increase your web design accessibility and inclusivity by checking and improving your code compliance with web accessibility guidelines.