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.CSS File Extension

File TypeCascading Style Sheet

4.1 (150 Votes)
CategoryWeb Files

What is a CSS file?

A CSS file is a cascading style sheet (CSS) file used to format the contents of a webpage. It contains customized, global properties for how to display HTML elements. CSS files can define the size, color, font, line spacing, indentation, borders, and location of HTML elements.

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Screenshot of a .css file in Adobe Dreamweaver CC 2017
CSS file open in Adobe Dreamweaver CC 2017

CSS files are used to create a similar look and feel across websites. They also are used to reduce the amount of work and HTML code generated by consolidating display properties into a single file.

CSS files are stored in a plain text format, which means you can open and edit them with any text editor. However, you should use web development programs, such as Dreamweaver and ColdFusion Builder, which provide more advanced features for editing CSS files.

Open and view .CSS files with File Viewer Plus.

Programs that open CSS files

Updated 12/21/2018

About CSS Files

Our goal is to help you understand what a file with a *.css suffix is and how to open it.

The Cascading Style Sheet file type, file format description, and Mac, Windows, Linux, Android, and iOS programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

If you would like to suggest any additions or updates to this page, please let us know.