How to open a .css file
Quick, free ways to open CSS on any system.
A .css file is a Cascading Style Sheets. If double-clicking does nothing, your computer simply does not have an app that reads CSS yet. Here is how to fix that on each operating system, using free software wherever possible.
Open a .css file step by step
- Confirm the file really is a .css. Drop it into the WhatFileType file identifier, which reads its signature without uploading anything.
- On Windows, open it with VS Code or Notepad++.
- On Mac, use VS Code or any editor.
- On Linux, try VS Code or any editor.
- Still stuck? Convert the .css to TXT, which opens more widely.
Best apps to open .css files
Windows
- VS Code
- Notepad++
- any editor
macOS
- VS Code
- any editor
Linux
- VS Code
- any editor
Web
- Browser dev tools show applied CSS
!
Before you open it: Safe. CSS only styles content and cannot execute program logic.
Frequently asked questions
Why can't I open my .css file?
Almost always because no installed app understands CSS. Install one of the apps above, or convert the file to a format your existing software already reads.
Can I open a CSS file in a browser?
A browser will show the raw text but not apply it visually on its own. To see its effect, it must be linked from an HTML page.