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  Live View

  Auto Updating Previews

  See the results of your code on multiple computers or devices as-you-type. Great for mobile testing or if you prefer having a full-page preview to watch as you work.

  If those other devices can receive text messages, you can send over the live URL directly from the editor just by entering the phone number. Works anywhere in the world!

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  Asset Hosting

  Easily Upload Files to Work With

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  And it doesn't have to be just images. It could be CSS, JavaScript, a PDF you want to link up, a short movie file, some JSON to request, really anything!

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  Collab Mode

  Pair Programming Across the World

  Live collaboration on code. Multiple people can type and edit code in a Pen at the same time, all while still seeing the live preview. There is a chat area too, all for the best in long distance pair programming!

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  Unlimited Embed Themes

  Style Embedded Pens To Match Your Site

  Your website has a unique look, so why should the code and demos you provide there look generic? The CodePen Embed Builder allows you to build themes to completely customize the look of Embedded Pens. Change the look of your site? Just change the theme and all your Embedded Pens change too.

  As a PRO, you'll be able to build unlimited themes, remove the branding, and even use your own totally custom CSS.

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  Professor Mode

  Teach a Classroom of Students

  Have students watch you work in real time! Every key press and click is shown live. Better than video - the students can interact with the code, see it live rendering, and participate in group chat.

  Students can even pause and play around with the code, and then catch back up to you with a single click.

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  Private Pens

  Keep Your Work Secret

  Mark your in-progress work as Private, so nobody can see your Pens until you want them to. Or, use a secret shareable URL to share it only with people you choose.

  Private pens are unlicensed, so you may apply your own before sharing so that you retain full ownership.

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• 100 times as many SMS messages.
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• Use a Pen as a header background for your profile.
• A PRO badge by your name to show everyone how swell you are.