Learn CODEPEN with Real Code Examples

Browser-based editor and live preview engine

Cloud storage for Pens and Projects

CDN-hosted libraries and assets

Collaboration engine for real-time editing (Pro feature)

Community feed for exploring user-generated content

Browser-based editor with live preview

HTML/CSS/JS panels rendered instantly in preview pane

External libraries loaded via CDN

Changes rendered asynchronously in browser

Supports animation and interactivity in real-time

Client-side editor with live rendering

Cloud-based storage for Pens and Projects

Optional real-time collaboration engine

Separation of HTML, CSS, JS panels

Community feed for discovering and remixing code

UI/UX experimentation for designers

Interactive front-end tutorials

Small client-side web apps

Community code showcases and inspiration

Prototype animations and visual effects

Live, interactive editing with immediate feedback

Focus on front-end web development

Encourage sharing and remixing in a community

Accessible to beginners and experts alike

Support creativity and prototyping without setup

Single Pen: lightweight code snippets

Project: multi-file web app prototypes

Team collaboration via Pro features

Large-scale community sharing

Integration with external hosting for production

Export Pens as ZIP

Import existing code via Projects or Pen import

Check dependencies for external libraries

Adjust preprocessors if needed

Test preview after migration