HTML Runner

Run HTML, CSS and JavaScript instantly in your browser.

No signup · Runs locally · Open source

Run HTML online without uploading your code

Paste HTML, CSS and JavaScript or import an HTML file. Sandboxed Run supports scripts in a restricted iframe. Strict Preview disables scripts and external network resources.

Frequently asked questions

Does HTML Runner upload my code?

No. Editor content and imported files stay in your browser.

Can it run JavaScript?

Yes in Sandboxed Run. Strict Preview disables JavaScript.

Is it open source?

Yes. HTML Runner is available under the MIT License.