Found 2 file types for the .CSS file extension

This page describes:
Cascading Style Sheets file

There is one other file type using
the CSS file extension!

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CSS file extension - Cascading Style Sheets file

What is .css file?

File type specification:

Internet related file type icon Internet related file type

css file icon: css filetype icon

The CSS file extension is associated with Cascading Style Sheets (CSS). The *.css files are used to format the contents of web pages.

A *.css file contains customized, global properties and other information about how to display HTML elements. It can define the size, background, colors, fonts, line spacing, indentation, borders, formats and location of HTML elements.

Basically, the *.css files are used to create a similar look and feel across whole websites. The .css files are also used to reduce the amount of work and HTML code generated by consolidating display properties into one single file. The .css files are stored in a plain text format.

The style sheets have existed in one form or another since the beginnings of SGML in the 1970s. Cascading Style Sheets were developed as a means for creating a consistent approach to providing style information for web documents.

The Cascading Style Sheets (CSS) helps Web developers create a uniform look for several pages within a Web site. Instead of defining the style of each table and each block of text within a page's HTML, commonly used styles need to be defined only once in a CSS document.
Once the style is defined in cascading style sheet, it can be used by any page that references the .css file. What more, the CSS allows to easy change styles across several pages at once.
For example, a Web developer is able to change the default font size from 12pt to 14pt for ten pages of his Web site at once. If the pages all reference to the same style sheet, the text size only needs to be changed on the style sheet and all the pages will have their font changed.

While Cascading Style Sheets are great for creating text styles, they are really helpful for formatting other aspects of the Web page layout as well. For example, the .css file can be used to define the cell padding of table cells, the style, thickness, and color of a table's border, and the padding around images or other objects. CSS gives Web developers much more control over how their web pages will look compared what the HTML format offers. For this very reason, most internet pages today incorporate cascading style sheets.

The CSS specifications are maintained by the World Wide Web Consortium (W3C).

MIME: text/css is registered for use with CSS by RFC 2318.

The default software associated to css file type:

Rapid CSS Editor picture or screenshot

Rapid CSS Editor

Company or developer:
  Blumentals Software

Rapid CSS Editor enables users to quickly and easily create and edit cascading style sheets of any size and complexity.

Top Style For Windows

Company or developer:
  topstyle4.com

TopStyle contains powerful tools for building standards-compliant web sites.

  • Preview CSS while you write it.
  • Easily create pleasant color schemes for your site.
  • Style Checker validates your CSS syntax against multiple browsers.
  • Use Site Reports to see at-a-glance where CSS styles are used in your site.
  • Style Upgrade quickly replaces all outdated HTML code with equivalent CSS styling.

What's new in TopStyle 4?

  • Unicode. TopStyle allows you to save your document ANSI-encoded (the TopStyle 3.x default), or Unicode-encoded (UTF-8 or UTF-16). When you open an existing document, TopStyle will auto-detect the encoding for the document you're trying to open.

  • Live FTP editing. The new FTP Explorer Panel allows you to edit online documents via FTP. When you save your document, it is automatically uploaded to your FTP site.

  • HTML toolbar. TopStyle comes with a new, user-configurable HTML toolbar that is displayed above the editor. Simply drag-n-drop any snippet from this HTML toolbar into your document.

  • New CSS definitions. TopStyle includes new CSS definitions for IE8 (Microsoft Internet Explorer 8), FF3 (Mozilla FireFox 3), SF3 (Apple Safari 3), and SF4 (Apple Safari 4).

  • Script Insight. TopStyle includes Script Insight for ASP (both JavaScript and VBScript), PHP, and ColdFusion.

  • Bookmarks. TopStyle contains new powerful commands for navigating your documents, including 10 bookmarked locations for each document.

  • iPhone (and iPod touch) webapp development. TopStyle includes iWebKit, a simple and advanced development framework for iPhone (and iPod touch) webapp development. In addition to iWebKit, TopStyle includes new CSS definitions for iPhone OS 1.1 and iPhone OS 2.0. Last but not least, TopStyle includes a new *internal* preview for Apple Safari.

  • Improved inline style. Inline style attributes (eg. style="|") support CSS color-coding and CSS Insight (Ctrl+Space).

  • HTML 5. TopStyle includes a new HTML definition for HTML 5 and a new HTML 5 template. TopStyle supports the new !DOCTYPE for HTML 5.

  • IE8 document compatibility. TopStyle allows you to switch IE8 document compatibility mode easily, and compare different IE8 document compatibility modes in it's side-by-side preview.

  • Improved CSS Insight. CSS shorthand (sub)property values are grouped. Insight includes recently used colors (CSS color properties only).

  • Live spelling (HTML only). TopStyle identifies spelling errors as you type with wavy red underlines, and allows you to act upon each identified problem with a new context menu.

  • Support for the latest web browsers. TopStyle auto-detects the latest web browsers, including Mozilla Firefox, Apple Safari, Opera, and Google Chrome.

  • Improved integration. TopStyle includes improved integration with HTML Tidy and CSE HTML Validator, including HTML link validation.

  • Compatible with Windows 7.

Related articles:

Cross-browser testing tools

Help how to open CSS files:

Use any suitable text editor or development suite to open or edit the .css files. You can also view the .css files with any modern internet browser.

How to convert file with extension CSS:

You can convert HTML files to CSS with the use of some SEO tools available on the internet, such as TABLE2CSS.

Related links:

Cascading Style Sheets home page

Informations about CSS at Wikipedia

Informations about this MIME type

List of software associated to the .css file extension

Recommended software programs are sorted by OS platform (Windows, Mac OS X etc.) and possible program actions
that can be done with the file
: like open css file, edit css file, convert css file, view css file, play css file etc. (if exist software for corresponding action in File-Extensions.org's database).

Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting of the css files.

  • Open css file
  • Edit css file
  • View css file
  • Convert css file
  • Create css file
  • Others css file

Software that open css file - Cascading Style Sheets file

Click on the link to get more information about listed programs for open css file action.

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