Developer Tools,
Made Simple ✨
Free, fast, and private. Format JSON, encode Base64, decode JWTs, generate UUIDs, and more — all without leaving your browser.
Why uPinned?
Built with developers in mind
100% Client-Side
Every tool runs entirely in your browser using JavaScript. No data is transmitted to external servers. Your API keys, tokens, and sensitive data stay on your machine.
Instant & Lightweight
Built with Next.js and optimized for speed. Each page loads in milliseconds with minimal JavaScript. No bloated frameworks, no unnecessary dependencies.
Zero Barriers
No accounts, no sign-ups, no rate limits. Just open a tool and use it. Every tool is free with no hidden limitations. Bookmark it and come back anytime.
About uPinned
uPinned is a collection of free online utilities built for developers, engineers, and anyone who works with data on a daily basis. Whether you need to quickly format a JSON response, encode a string, inspect a JWT token, or generate unique identifiers, uPinned provides the right tool — instantly.
What makes uPinned different from other online tools? Privacy by design. Every tool processes data exclusively in your browser. There is no backend server handling your requests, no database storing your inputs, and no analytics tracking what you paste. When you use uPinned, your data genuinely stays yours.
The platform is built with modern web technologies — Next.js for server-side rendering and SEO, React for interactive UI components, and Tailwind CSS for a clean, responsive design. All pages are statically generated at build time, ensuring the fastest possible load times regardless of your location.
uPinned is actively maintained with new tools and improvements added regularly. If you have suggestions for tools you would like to see, feel free to reach out. Our goal is to build the most useful, trustworthy, and developer-friendly tool suite on the web.
From the Blog
In-depth guides to help you understand the concepts behind the tools
Understanding JWT Tokens: A Complete Guide for Developers
Learn everything about JSON Web Tokens — how they work, their structure, common use cases, and security best practices.
Base64 Encoding Explained: How It Works and When to Use It
A comprehensive guide to Base64 encoding — how it works, the encoding algorithm, practical use cases, and common pitfalls.
JSON for Developers: Syntax, Parsing, and Best Practices
Master JSON — syntax rules, parsing in JavaScript, common errors, validation techniques, and best practices for working with JSON data.
URL Encoding Demystified: Percent-Encoding and JavaScript Functions
Understand percent-encoding, the difference between encodeURI and encodeURIComponent, query string handling, and common pitfalls.
Understanding Hash Functions: MD5 vs SHA Explained
Learn how hash functions work, the differences between MD5, SHA-1, SHA-256, and SHA-512, and when to use each algorithm.
Regular Expressions Crash Course: From Zero to Pattern Matching
A beginner-friendly guide to regular expressions — syntax, quantifiers, character classes, groups, lookaheads, and practical examples.
Color Theory for Developers: HEX, RGB, and HSL Explained
A practical guide to color formats for web developers. Understand HEX, RGB, HSL, and HSB, and master CSS color functions.
Markdown Syntax Cheat Sheet: The Complete Reference
The ultimate Markdown cheat sheet — headers, emphasis, lists, links, images, code blocks, tables, and GitHub Flavored Markdown.
Bookmark uPinned 📌
Press Ctrl+D (or ⌘+D on Mac) to bookmark this page for quick access to all developer tools.