Built for your first line of code
CodeNest is a free, in-browser IDE for writing HTML, CSS and JavaScript and seeing the result instantly — made for people who are just starting to learn how the web works.
Why we built it
Most code playgrounds are designed for developers who already know their way around a build tool, a terminal, or a package manager. That's intimidating if you've never written a line of code before. CodeNest strips that away: there's no sign-up, no installation, nothing to configure. You open the page, start typing, and watch your work come to life in the live preview next to it — the same loop that makes learning to code feel rewarding instead of confusing.
How it works
Everything runs entirely in your browser. There's no server processing your code and no account required:
- Write HTML, CSS and JavaScript in three files inside the editor — switch between them using the tabs.
- Hit
Run(or pressCtrl+Enter) and the live preview updates instantly. - Your work is saved to your browser automatically, so closing the tab won't lose your progress.
- When you're happy with what you've built, download the whole project in one click.
What CodeNest is for
First steps
A safe place to try your very first <h1> tag or CSS rule without breaking anything.
Quick experiments
Testing a snippet, checking how a CSS property behaves, or prototyping a small idea.
Teaching & classrooms
A lightweight tool teachers can point students to without asking anyone to install anything.
Sharing snippets
Download your work as a clean project you can send to a friend or host anywhere.
What it isn't
CodeNest isn't trying to replace full-featured editors like VS Code, or collaborative platforms built for teams shipping production apps. It's intentionally small in scope: a focused editor, one live preview, nothing to install. If you outgrow it, that's a good sign — it did its job.
Who's behind it
CodeNest is an independent, small-scale project. We keep it free by showing a small number of advertisements, described in our Privacy Policy. If you have feedback, ideas, or spot a bug, we'd genuinely like to hear from you.