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Write HTML Markdown, Haml, Slim, or Pug. Write CSS in Sass, Less, Stylus, or PostCSS. Those are just some of the preprocessor syntaxes you can use on CodePen. We want you to feel comfortable in whatever languages you already know and like.

And we also want you to be able to explore and learn new ones easily.

Or, don’t use them at all. You do you.

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You have complete control over the look of the Embedded Pens. With our Embed Builder, you can quickly change colors and settings, even making them into a theme you can apply to multiple Embedded Pens. Or you can take complete control by applying your own custom CSS.

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In Presentation Mode, the screen can be arranged just how you like it to display the code and result you want to show. Adjust settings on the fly to make things easier to see. Then quickly give your viewers a URL to the very code you are presenting.


CodePen can be used for teaching in all kinds of different ways. Teachers can provide instructional Pens that students need to fork, work on, and then turn back in.

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You might create a Collection of user interface components you’d like to implement on a particular project. Or a group of Pens that serve as starts for assignments in a web education class. Or a group of Pens that are a tribute to The Smurfs. Anything you want!

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You type, up to 100 students watch and interact with your code in their browser.

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