Developer Tools
Secure, client-side tools for software engineers.
JSON Formatter & Validator
Format, beautify, and validate JSON data instantly.
Text & Code Diff Checker
Compare two pieces of text or code to find differences.
Base64 Encoder/Decoder
Encode strings to Base64 or decode Base64 back to text.
MD5 & SHA Hash Generator
Generate MD5, SHA-1, and SHA-256 cryptographic hashes.
JWT Decoder
Instantly decode JSON Web Tokens (JWT) to view headers and payloads.
URL Encoder & Decoder
Encode strings for safe URL transmission or decode URL query strings.
UUID / GUID Generator
Bulk generate cryptographically secure v4 UUIDs instantly.
HEX to RGB Color Converter
Convert CSS color formats between HEX, RGB, and HSL.
CSS Box Shadow Generator
Visually design CSS box shadows and generate the code.
Markdown Editor & Preview
Write Markdown and preview the HTML rendering in real-time.
HTML Entity Encoder
Encode or decode HTML characters securely.
Secure Developer Utilities
Welcome to Free Qube's Developer Tools hub. Designed specifically for software engineers and data analysts, this suite helps you process raw text and code snippets quickly and securely. We know that developers often work with proprietary code, sensitive JSON payloads, and private API keys. That is why every utility here—from our JSON Formatter to the Base64 Encoder and Hash Generator—processes all data entirely in your local web browser. None of your text is ever sent to our backend servers, ensuring lightning-fast performance and absolute data privacy.