About HCODX

One platform for everything you write, run, and ship.

HCODX is a free, browser-based developer platform. It combines a live-preview HTML/CSS/JS editor, an advanced VS Code-style IDE, an online compiler for 85+ programming languages, and 200+ production-grade developer tools — with no installs and no signup.

Open Editor Try VS Editor

hello.py — HCODX

# Run 85+ languages instantly in your browser
def greet(name):
    return f"Welcome to HCODX, {name}"

print(greet("developer"))

85+

Programming languages

200+

Developer tools

Editor modes

Signup required

What is HCODX

A complete coding environment — in a tab.

HCODX (pronounced H-Code-X) is a high-performance, privacy-first platform built for modern developers, students, educators, and teams. Every product on HCODX runs directly in your browser: your code stays on your device, the interface is fast, and you can move from idea to running code in seconds.

Editors

Two editors. One platform.

From a fast, distraction-free HTML/CSS/JS playground to a full VS Code-style IDE with multi-file projects and NPM modules.

Standard

HCODX Editor

A fast, lightweight HTML, CSS, and JavaScript editor with instant live preview, integrated console, and local-storage persistence — beginner friendly, zero setup.

Open Editor

Pro · VS Code Style

VS Editor

The advanced VS Code-style IDE with Monaco editor, multi-file projects, NPM module support, and frameworks: Vue, React, Next.js, Three.js — built for professional development in the browser.

Open VS Editor

Built-in editor capabilities

Live previewReal-time rendering of HTML, CSS, and JavaScript as you type.
Multi-file projectsFile tree, tabs, and project persistence — manage real codebases.
Syntax highlightingMonaco-powered highlighting for HTML, CSS, JS, TS, Vue, JSX, and more.
Integrated consoleDebug JavaScript directly inside the editor — logs, errors, traces.
NPM modules (VS Editor)Import packages from NPM and use frameworks like React or Vue.
Auto-format & lintOne-click Prettier formatting and on-the-fly validation.
Light & dark themesEditor and UI follow your OS preference automatically.
One-click exportDownload your project as ready-to-deploy HTML/CSS/JS files.
Responsive previewPreview your site at any device size from the built-in emulator.
Runs offline-capableMost editor features work without a server round-trip.

Online Compiler

Run 85+ programming languages — instantly.

HCODX includes a fast, full-featured online compiler. Choose a language, write your code, hit run — get real output with interactive stdin and complete error feedback. No installs, no environment setup.

Python JavaScript TypeScript Node.js Deno (TS) C C++ C# Java Kotlin Scala Groovy Go Rust Zig Nim Dart Swift Ruby PHP Perl Lua R Julia GNU Octave Haskell OCaml F# Elixir Erlang Clojure Lisp Racket Smalltalk Crystal D V CoffeeScript Raku COBOL Fortran Pascal BASIC Prolog Bash PowerShell AWK SQLite NASM x86 NASM x64 Brainfuck Befunge-93 CJam BQN GolfScript Jelly Vyxal LOLCODE Rockstar Emojicode COW See full list of 85+ languages

Interactive stdinPipe real input into your program at runtime.
Real-time outputStreamed stdout/stderr with execution time and exit code.
Zero setupPick a language, write code, run. That's it.
Fast cloud runtimeTuned execution backends for snappy compile + run cycles.

Open Compiler Browse all languages

200+ Developer Tools

A complete dev utility library, online.

Over 200 free, in-browser tools across formatters, minifiers, converters, generators, security, network, color, AI, and more — every utility you'd otherwise glue together from scattered sites.

Formatters & Beautifiers

25+

JSON, HTML, CSS, JS, YAML, XML — pretty-print, validate, and lint with a single click.

JSON Formatter HTML Formatter CSS Beautifier JS Beautifier Prettier YAML XML

Minifiers

Compress code for production — HTML, CSS, JS, JSON. Smaller files, faster loads.

JS Minifier CSS Minifier HTML Minifier JSON Minifier Code Unminifier

Converters

60+

Convert between JSON, YAML, XML, TOML, CSV, INI, HTML, Markdown — plus JSON-to-code for 10+ languages.

JSON Converter JSON → YAML CSV → JSON HTML → Markdown JSON → TypeScript JSON → Python Color Converter

Encoding & Security

30+

Base64, URL, HTML entity, hex, hashes, HMAC, bcrypt, JWT decode, AES — encode, decode, verify.

Base64 Hash Generator HMAC Bcrypt Verify JWT Decode Caesar Cipher Checksum

Network & IP

10+

IPv4/IPv6, CIDR, subnet, DNS lookups, IP-to-int — every networking helper a developer needs.

CIDR Calculator IP Converter IPv4 → IPv6 IP → Integer

Generators

25+

UUID/GUID, passwords, lorem ipsum, fake data, QR, favicons, .htaccess, robots.txt, sitemaps.

UUID/GUID Fake Data Favicon .htaccess robots.txt QR Code

Color & CSS

20+

Color converters, gradient and shadow builders, clamp generator, picker, palette tools.

Color Picker HEX/RGB/HSL Gradient Box Shadow Border Radius CSS clamp() Color System

Text & Data Utilities

25+

Case converter, character counter, find/replace, dedupe, diff, regex tester, slugify.

Case Converter Char Counter Find / Replace Deduplicate Code Diff JSON Diff

Validators

12+

HTML validator, JSON lint, YAML/XML validators, schema checkers, link checkers.

HTML Validator JSON Lint YAML Validator XML Validator JSON Schema

AI Tokens & Cost

25+

Token counters and cost calculators for Claude (Opus/Sonnet/Haiku), GPT-4o/5, Gemini, DeepSeek, and more.

Claude Opus Claude Sonnet Claude Haiku GPT-5 GPT-4o Gemini DeepSeek Token Counters

Image & Media

10+

Image to Base64, favicon generation, image compressors, emoji picker, ASCII art.

Image → Base64 Favicon Emoji Picker ASCII Tools

Web & Performance

12+

Lighthouse audits, AMP testing, device emulator, JS obfuscator, AI HTML builder.

Lighthouse Audit AMP Tester Device Emulator JS Obfuscator AI HTML Builder

Browse all 200+ tools

Why HCODX

Built around how developers actually work.

Privacy-first

Editor projects stay in your browser. No tracking of your source code, no required accounts.

Built for speed

Optimized payloads, instant cold loads, minimal UI chrome. Designed to keep you in flow.

One platform

Editor, IDE, compiler, and 200+ tools in one place — replace a dozen open browser tabs.

Any device

Mobile-first responsive UI. Code from a laptop, a tablet, or a phone — anywhere.

No signup

Open a URL, start coding. No email, no password, no friction.

Always free core

Editor, compiler, and dev tools stay free. Pro features remain optional for power users.

Who uses HCODX

Trusted by developers, students, and teachers worldwide.

Developers

Prototype components, debug snippets, share runnable demos in seconds.

Students

Practice 85+ languages on any device — perfect for courses, bootcamps, self-study.

Educators

Share live, runnable examples with classrooms — no installs for students.

Teams

Quickly share a reproducible bug case, demo, or formatted dataset — by URL.