How to use JavaScript Compile Online
- Drop your text into the field at the top of JavaScript Compile Online.
- Click Run to process it instantly in your browser.
- When it looks right, Copy to save it.
About this tool
JavaScript Compile Online is a static, client-side tool with no backend. JavaScript Compile Online runs the JavaScript you write inside a sandboxed iframe in your browser and shows whatever you log to the console.
The sandbox has no access to this page, your cookies or your storage, so your code cannot affect the site around it. Your code runs in a sandboxed iframe isolated from this page, with no access to your cookies or storage, and nothing you write is uploaded.
Frequently asked questions
How do I use JavaScript Compile Online?
JavaScript Compile Online lets you process your input right in the browser, with the result shown instantly and nothing uploaded.
Is JavaScript Compile Online free to use?
Yes — JavaScript Compile Online is completely free, with no usage limits.
Where is my data processed by JavaScript Compile Online?
Entirely in your browser — JavaScript Compile Online keeps your data on your own machine and sends nothing anywhere.
Is the code in JavaScript Compile Online really sandboxed?
Yes — JavaScript Compile Online runs your code in an iframe with the sandbox attribute and a separate origin, so it cannot read this page, your cookies or your storage.
Does JavaScript Compile Online work on mobile?
Yes — JavaScript Compile Online is just a web page and runs on any modern browser, including phones and tablets.