CSS Poster is a free online tool to convert CSS file to a quick reference poster. You just need to upload your CSS file, and it will create a poster out of it where you can quickly see various CSS attributes that you have in your file.
CSS Poster is pretty easy to use. You do not need to create any account, and do not need to download or install anything. Just go to CSS Poster. Then, upload your CSS file. You can choose the font size of your poster. After that, just click on “Create Poster” button.
CSS Poster will then convert your uploaded CSS file to a CSS poster that you can download. I find this a really useful app to quickly refer to major attributes of your CSS file.