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Write HTML, CSS, and JavaScript and get a real-time preview. You can use CodePen to:

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The possibilities are endless. Everything you do is saved on CodePen, so the more you use it the more useful it becomes.

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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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Your profile on CodePen is like your front end development portfolio. You can showcase all your best work there. Proof positive you’re the genius your mother always told you you were.

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Check out some of Team CodePen’s profile’s like Chris CoyierMarie Mosley, and Rachel Smith.

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Any Pen can be embedded on any other website. It’s just some simple copy-and-paste HTML code. Embedded Pens are the most compelling way to display code demos. Not only can you see the real final rendered result (screenshots, pshaw) but you can see all the code used to make it in luscious syntax highlighting.

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.

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The social aspect is part of what makes CodePen a fun place to be.


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Collections are groups of Pens. It’s a way to organize and share Pens that have some useful or fun connection.

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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Coding is better together. Pair program with 2-6 people anywhere in the world in real time.

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With (unlimited) Embed Themes, you can instantly change the look of all Embedded Pens and update them anytime.

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

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  • Feature a Pen in your profile header
  • See no ads on CodePen
  • 6 person Collab Mode (Pens only)
  • 35 person Professor Mode (Pens only)
  • Asset hosting with 10 GB total storage
  • 25 projects with 150 files/Project
  • 5 deployed Projects
  • Use your own domain for Projects