Online IDE Code Editor, Compiler & Interpreter
A full, fast code editor in your browser. Run seven languages, render charts and SVG, open whole folders, go fullscreen, and never send a single byte to a server.
Languages You Can Run
Seven runtimes, all executed inside your browser. Use the language picker in the toolbar to switch instantly.
JavaScript
Runs natively in a sandbox. Zero download.
TypeScript
Transpiled in your browser, then run.
HTML / CSS
Live, isolated page preview.
SVG
Render and preview vector graphics.
Python 3
Full CPython via WebAssembly. NumPy & Matplotlib ready.
Lua
Lua 5.4 compiled to WebAssembly.
SQL (SQLite)
Real SQLite engine, in-memory.
Not supported
Languages needing a full compiler toolchain — Java, C, C++, C#, Go, Rust, Swift, Kotlin, Ruby, PHP, cannot run purely in a browser without a server. You can still open and edit those files; the Run button is disabled for them.
About This Online IDE
This is a fully client-side, VS Code-style IDE. Open a single file or a whole folder, work across multiple tabs, switch between a GitHub-flavoured dark theme and an Apple-flavoured light theme, move the output panel to the bottom or the side, expand the editor to fullscreen, and run seven languages, JavaScript and TypeScript natively, Python through Pyodide (with Matplotlib charts rendered inline), Lua through a WebAssembly engine, SQL through real SQLite with downloadable CSV results, plus live HTML and SVG preview. Runtimes download from a public CDN only the first time you use them, so the editor itself stays light.
Every execution happens inside a sandboxed iframe or a Web Worker with no access to the parent page, your storage, or your browser navigation. Uploaded files live in memory and are saved locally for your convenience, never sent anywhere. It is built for quick experiments, learning, data exploration, interview practice, and prototyping without installing a thing.
Locked Inside a Sandbox
Every language runs in an isolated browser sandbox with no access to your data, your storage, or any other site. Nothing you write or upload ever leaves your device.
Frequently Asked Questions
Use the language picker in the top toolbar. Choosing Python, Lua, SQL, SVG, HTML, JavaScript or TypeScript instantly loads a working sample. Press Run and you will see real output, a console, a table, a chart, or a rendered graphic.
Yes. HTML and SVG files render live in the preview pane. Python plots made with Matplotlib are captured and shown as images automatically. Any program output that is an image data-URL or an SVG snippet is rendered inline, and each image has its own download button.
Yes. The output panel has a download button: SQL results download as CSV, HTML and SVG previews download as files, console output downloads as text, and individual images download as PNG.
Those runtimes download once from a public CDN (cdn.jsdelivr.net / esm.run). On a restricted network those domains may be blocked, in which case the IDE shows a clear message. JavaScript, HTML and SVG always run with no download.
No. Every language runs entirely inside your browser, in a sandboxed iframe or Web Worker. Uploads stay in memory and in your browser only. There is no backend.
No. Those need a full compiler toolchain that cannot run purely in a browser. The Run button is disabled for those file types, though the editor still displays and edits them with syntax colouring.
Maximum safety by default. HTML and SVG preview ships with scripts BLOCKED, inline event handlers like onerror, onclick, and any <script> tag are inert. If you need JavaScript in your preview you can flip the "Scripts" badge in the preview header to allow it, and even then the iframe runs in a unique opaque origin without same-origin access, so it cannot read this page, your storage, your cookies, or navigate your browser. JavaScript and TypeScript run in a separate sandboxed iframe with a 10s timeout, and Python runs in an isolated Web Worker.
Seven languages are available, JavaScript, TypeScript, HTML, SVG, Python, Lua, and SQL, and the "Lang" picker in the toolbar switches between them instantly. Clicking it shows the full list with a runnable sample for each.
Yes. Open tabs, their contents, your theme, output position, and workspace are saved locally in your browser and restore when you return. Nothing is ever uploaded.
