Which programming languages are supported?

The editor supports JavaScript, TypeScript, Python, HTML/CSS/JS, and SQL (SQLite). All five run entirely in your browser — JavaScript and TypeScript via a sandboxed iframe, Python via Pyodide (WebAssembly), and SQL via sql.js (WebAssembly).

Is my code private and secure?

Absolutely. All code runs 100% locally in your browser. Nothing is sent to any server. Your code never leaves your device, making this one of the most private code editors available.

Does it work offline?

After the initial page load (which downloads the WebAssembly runtimes for Python and SQL), the editor works completely offline. JavaScript, TypeScript, and HTML run with zero external dependencies.

What happens if my code runs forever?

JavaScript and TypeScript execution has a 5-second timeout. Python runs in the main thread with WebAssembly, so very long computations may briefly freeze the browser tab. SQL queries execute against an in-memory database and are generally instant.

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Run code 100% in your browser

Free Live Code Editor - Run JavaScript, Python, TypeScript, SQL Online

Write and run JavaScript, TypeScript, Python, HTML/CSS, and SQL directly in your browser. 100% offline, zero API calls.

Live Code Editor

Write, run, and test code directly in your browser — 100% offline, zero API calls

Runs locally in your browser

Press Ctrl + Enter to run

JavaScript

12 lines

Click Run ▶ to execute your code

or press Ctrl + Enter

100% Browser-Based

All code runs locally in your browser. No server calls, no API keys, works completely offline.

5 Languages

JavaScript, TypeScript, Python (via Pyodide WebAssembly), HTML/CSS, and SQL (SQLite).

Private & Secure

Your code never leaves your device. No signup, no tracking, no data collection.

What Is a Live Code Editor?

A live code editor is an online tool that lets you write and run code directly in your web browser without installing any software. FreeDevKit's editor runs 100% locally — JavaScript, TypeScript, Python (via Pyodide WebAssembly), HTML/CSS/JS, and SQL (SQLite) all execute in your browser with zero API calls. Your code never leaves your device.

How to Use This Free Online Code Editor

1
Select a programming language from the dropdown menu (JavaScript, TypeScript, Python, HTML, or SQL).
2
Write or paste your code in the editor panel on the left.
3
Click "Run ▶" or press Ctrl + Enter to execute your code locally in your browser.
4
View the output, errors, and execution time in the output panel on the right.
5
For HTML, switch to the "Preview" tab to see a live rendered preview of your page.

Key Features

100% browser-based execution — no server calls, works completely offline
JavaScript and TypeScript run instantly in a sandboxed iframe
Python runs via Pyodide (CPython compiled to WebAssembly) with full standard library
HTML/CSS/JS live preview with interactive rendering
SQL (SQLite) runs via sql.js with full table creation, queries, and joins
Line numbers, tab indentation, and syntax-friendly monospace editor
Execution time tracking for performance benchmarking
Sample code templates for every supported language
Keyboard shortcut (Ctrl + Enter) for quick execution

Why Use FreeDevKit?

100% offline — zero API calls, no network required after initial page load
Your code never leaves your device — complete privacy guaranteed
No signup, no installation, completely free with no usage limits
Python via WebAssembly means real CPython with standard library support
SQL lets you practice queries with in-memory SQLite databases
Clean, distraction-free interface designed for focused coding

Frequently Asked Questions

Yes, FreeDevKit's live code editor is completely free with no hidden costs, no signup, and no usage limits. You can write and run code as many times as you want.

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