About DevToolBelt
DevToolBelt is a free collection of online developer tools built for speed, privacy, and simplicity. Every tool runs entirely in your browser — your data never leaves your device.
Our Mission
We believe developer tools should be free, fast, and respectful of your privacy. Too many online tools send your data to remote servers, require sign-ups, or bombard you with intrusive ads. DevToolBelt is different. We built a platform where every computation happens client-side, using modern browser APIs like Web Crypto, TextEncoder, and Canvas. Nothing is uploaded. Nothing is stored. Nothing is tracked.
Why We Built This
As developers, we found ourselves constantly searching for quick utilities — a JSON formatter here, a Base64 decoder there, a timestamp converter somewhere else. Each site had different quality levels, different privacy practices, and different amounts of advertising clutter. We wanted one reliable place with all the tools we use daily, built with modern technology and designed with developers in mind.
DevToolBelt started as a personal project and grew into a comprehensive platform with 18+ tools covering everything from data formatting and encoding to AI development utilities. We added an interactive Prompt Engineering course because we believe AI literacy is becoming essential for every developer, regardless of their specialization.
Our Values
Privacy First
All processing happens in your browser. We never collect, store, or transmit your data. Your JSON, tokens, passwords, and code stay on your machine.
Speed Matters
Our tools load instantly and process data in milliseconds. No server round-trips, no loading spinners, no waiting. Just results.
Always Free
Every tool on DevToolBelt is free to use without limits. No sign-ups, no premium tiers, no feature gates. Developer tools should be accessible to everyone.
Developer Experience
Clean interfaces, keyboard shortcuts, copy buttons, sample data, and dark mode. We build for developers because we are developers.
What We Offer
DevToolBelt currently features 18 developer tools organized into categories including Formatters, Encoders, Generators, Converters, Decoders, and AI Tools. Each tool includes detailed documentation, use cases, frequently asked questions, and sample data to help you get started quickly.
Beyond tools, we offer an interactive Prompt Engineering course designed for beginners and experienced developers alike. The course covers everything from basic prompting techniques to advanced strategies like chain-of-thought reasoning and few-shot learning. Each lesson includes quizzes to test your understanding.
We also maintain a curated collection of developer resources — books, courses, hosting services, and software recommendations that we personally use and trust.
Technology Stack
DevToolBelt is built with Next.js 14 (App Router), TypeScript, and Tailwind CSS. We use React Server Components for fast initial page loads, client-side rendering for interactive tools, and static generation for SEO-optimized content pages. The entire codebase follows modern best practices including type safety, accessibility standards, and responsive design.
Get in Touch
Have a suggestion for a new tool? Found a bug? Want to collaborate? We would love to hear from you. Visit our contact page to reach out, or connect with us on social media.
Support Us
DevToolBelt is free to use and always will be. If you find our tools helpful, you can support us by sharing the site with colleagues, bookmarking it for future use, or buying us a coffee. Every bit of support helps us keep the lights on and build more tools.