CSS File - opening and understanding
Did your computer fail to open a CSS file? We explain what they are used for and recommend software that we know can open or otherwise handle your .CSS files.
What is a CSS file?
CSS is an acronym for Cascading Style Sheet. Files that contain the .css file extension are used to format the contents of an associated Web page. While the CSS file format is most commonly associated with website pages that have been written in the HTML and XHTML programming languages, the format can also be applied to any type of XML document.
A CSS file contains the properties that define how the HTML elements of an associated Web page will be displayed, such as the color, font, size, line spacing, borders and other HTML elements.
CSS files are similar to template files, allowing users to create multiple websites featuring a similar look and feel without having to create each and every site from the ground up.
How to open CSS files
You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension CSS for different purposes.
While we have not verified the apps ourselves yet, our users have suggested 10 different CSS openers which you will find listed below.
Suggest another file format using extension CSS
While we know of one file format using the .CSS file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .CSS file.
Various viewers for this file format
These apps are known to open certain types of CSS files. Remember, different programs may use CSS files for different purposes, so you may need to try out a few of them to be able to open your specific file.
 | Free File Viewer | User submitted |
 | Adobe Dreamweaver | User submitted |
 | Microsoft Expression Web | User submitted |
 | Macromedia Dreamweaver MX | User submitted |
 | Microsoft Office | User submitted |
 | Microsoft Development Environment | User submitted |
 | Microsoft Web Platform Extensions | User submitted |
 | Crescent Eve | User submitted |
 | UltraEdit | User submitted |
 | Aptana Studio | User submitted |
Not sure exactly what type of file you are trying to open? Try our new File Analyzer. It is a free tool that can identify more than 11,000 different kinds of files - most likely yours too! It will help you find software that can handle your specific type of file. Download File Analyzer here.