There are several online tools that we can use to compile our Sass files down to CSS files. One of the ones I like is named Sass Meister, and you can access it here: http://www.sassmeister.com.

I like it because it is super easy to use and provides decent help when there is a problem with your Sass syntax. It also supports both Sass syntaxes, the older style, and the newer style, and it also allows you to choose from a few different Sass compilers. You can find these settings under the Options menu option at the top of the window panes.

To use the tool, simply write your Sass code in the left pane, and the compiled CSS will appear in the right pane. Pay attention to the selected options so that the ones that are activated are the ones you want.