HTML compressor tools are software programs or online services that compress or minify HTML code by removing whitespace, comments, and other unnecessary elements from the code. The compressed code retains the same functionality as the original HTML code but takes up less space and can improve website loading times.

HTML compressor tools are commonly used by web developers and website owners to optimize their website's performance by reducing page load times. This optimization can improve the user experience, increase website traffic, and help with search engine rankings.

Some popular HTML compressor tools include HTMLMinifier, Minify Code, YUI Compressor, and Closure Compiler. These tools typically work by analyzing the HTML code and automatically removing redundant or unnecessary elements. Some tools may also provide options for customizing the compression process, such as preserving certain elements or formatting the compressed code in a specific way.

Overall, HTML compressor tools can be a useful way to optimize website performance by reducing the size of HTML code and improving page load times.