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What are CSS files and how to open them

Are you having problems opening a CSS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CSS files.

What is a CSS file?

CSS files have multiple uses, and Cascading Style Sheet is one of them. Read more about the other uses further down the page.

Cascading Style Sheet 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 written in the HTML and XHTML markup languages, it can also be applied to XML documents.

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 visual elements.

CSS files are similar to template files, allowing users to create multiple websites featuring a similar look and feel without making every site from the ground up.

How to open CSS files

We have identified nine CSS openers that are compatible with this specific type of CSS file.

Programs that open Cascading Style Sheet files

Last updated: January 3, 2024

All known file formats using extension .CSS

While Cascading Style Sheet File is a popular type of CSS-file, we know of 2 different uses of the .CSS file extension. Different software may use files with the same extension for different types of data.

Cartoon Studio Script File

Cartoon Studio is an animation program for the Commodore Amiga, a home computer popular in the 1990s.

While we have not verified the apps ourselves yet, our users have suggested ten different CSS openers which you will find listed below.

Various apps that use files with this extension

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.

Macromedia Dreamweaver MXMacromedia Dreamweaver MXUser submitted
Microsoft OfficeMicrosoft OfficeUser submitted
Microsoft Web Platform ExtensionsMicrosoft Web Platform ExtensionsUser submitted
Crescent EveCrescent EveUser submitted
Aptana StudioAptana StudioUser submitted
Macromedia DreamweaverMacromedia DreamweaverUser submitted
Edge Code CCEdge Code CCUser submitted
BluefishBluefishUser submitted
Oxygen XML EditorOxygen XML EditorUser submitted
TopStyleTopStyleUser submitted

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CSS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.