Free online developer tools — no registration required

Programming
World

A collection of powerful online tools and resources for programmers. Build faster with our free Code Editor, String Utilities, Icon Generator, and more.

✦ Explore Tools View Apps →

// Featured Tools

Everything you need to code faster

All tools run directly in your browser — free, fast, and no sign-up required.

💻

Online Code Editor

Write and preview HTML/CSS/JS in real-time. Supports Emmet, Babel, React, syntax highlighting and Sublime shortcuts.

Open Editor →

🔤

String Utilities

Compare string functions across PHP, Java, Python, JS, Ruby, C and more. Encode, hash, format strings instantly.

Try String Tools →

🎨

App Icon Generator

Upload one image and get all required icon sizes for iOS App Store and Google Play Store automatically.

Generate Icons →

📄

PDF Toolkit

Compress PDFs, convert images to PDF, and extract PDF pages to images — all online, all free.

Open PDF Kit →

🔍

SEO Audit Tool

Audit any web page for SEO issues. Check meta tags, headings, performance indicators and get actionable advice.

Audit a Page →

🌐

Unicode Converter

Search, convert and encode Unicode characters. Essential for handling multilingual text and special symbols.

Open Unicode →

// Highlighted Features

Tools that developers love

App Icon Generator — One Click

The fastest way to generate all required app icon sizes for both iOS and Android platforms. No Photoshop, no hassle.

Supports all iOS App Store sizes
Generates Android drawable folders automatically
Preview icons before downloading
Batch export as a ready-to-use ZIP

Try It Yourself →

String Functions — Multi-language Reference

Compare how string manipulation works across programming languages side-by-side. Encode, hash, and transform text instantly.

Encoding: Base64, URL, HTML entities
Hash: MD5, SHA-1, SHA-256, SHA-512
Developer & Writing utilities
Cross-language reference (PHP, Java, Python...)

Try It Yourself →

Online Code Editor — Live Preview

A lightweight but powerful HTML/CSS/JS editor that runs entirely in your browser. No setup, works out of the box.

Real-time live preview
HTML editor with Emmet support
Built-in Babel & React — no CDN needed
Console (log / error / info / warn)
Download your work as an HTML file

Try It Yourself →

// Applications

Mini Apps & Games

A growing collection of browser-based apps and games — play directly online or install on Android & iOS.

QR Code Scanner

🤖 🍎

thegioilaptrinh.net ~ developer tools

$ open string-tools
→ Loading 100+ String Functions for PHP, Java, Python, JS, Ruby, C...
✓ Ready! Encoding, Hashing, Web & Writing tools loaded.

$ open code-editor
→ Initializing HTML/CSS/JS playground with live preview...
✓ Emmet, Babel, React bundled. Happy coding!

$ open app-icon-generator
→ Loading iOS & Android icon size presets...
✓ Upload your image and get all sizes in one ZIP.

$

Programming
World