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Programming Tools

Code, compile and debug in your browser. Syntax highlighting, formatting, sandbox environments and online IDEs for multiple languages.

7 tools available

Developer Tools 7

Testing & Debugging 4

HTML Previewer

Run HTML, CSS and JavaScript online with live preview, real console errors, responsive device widths and CDN libraries. Sandboxed, free, no signup needed.

XPath & CSS Selector Tester

Online XPath evaluator and querySelectorAll tester for HTML/XML — instant match count, real highlighting, and copy-as-code for Scrapy, Selenium and Playwright.

C Sandbox

Online C sandbox — compile and run C with GCC 10.2 in your browser. Pick C89/C99/C11/C17, toggle -Werror, add flags (-Wall -O2 -lm), feed stdin. Zero install.

Python Sandbox

Run Python 3 in your browser via Pyodide (CPython on WebAssembly). Full stdlib, pip via micropip, persistent session, offline after first load. Zero install.

Utilities 3

HTML to JSX

Free online HTML to JSX converter for React. Renames class→className, for→htmlFor, builds style objects, self-closes void elements, outputs typed .tsx.

JavaScript Obfuscator

Free private JavaScript obfuscator. 100% browser-side, with presets, control-flow flattening, string-array encoding, Node.js target and reproducible seed.

cURL to Code

Convert curl to fetch, Python, PHP, Node, Java, C# and more. Paste a Chrome DevTools 'Copy as cURL' and redact API keys in one click. Client-side.