The latest articles on DEV Community by Shabir Ahmad (@shabir_ahmad_tech). https://dev.to/shabir_ahmad_tech https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3978014%2F60302f76-3ef0-4aed-8574-5d7b514078f6.png https://dev.to/shabir_ahmad_tech en Shabir Ahmad Mon, 27 Jul 2026 06:33:51 +0000 https://dev.to/shabir_ahmad_tech/i-built-47-free-dev-tools-that-run-entirely-in-your-browser-1me https://dev.to/shabir_ahmad_tech/i-built-47-free-dev-tools-that-run-entirely-in-your-browser-1me <p>Every developer has done it — copy-pasted a JWT, a private key, or a JSON blob with sensitive data into some random website and held their breath. Wondering if it was being logged, tracked, or worse.</p> <p>Every developer has done it — copy-pasted a JWT, a private key, or a JSON blob with sensitive data into some random website and held their breath. Wondering if it was being logged, tracked, or worse.</p> <p>I built <a href="https://krumb-dev-five.vercel.app" rel="noopener noreferrer">KRUMB.DEV</a> because I wanted tools that didn't make me feel dirty after using them.</p> <h2> What Is It? </h2> <p>46 developer tools, all in one place. No signup. No uploads. No tracking. Open source.</p> <p>The terminal-inspired interface isn't just aesthetic — it's a constraint. Every tool fits in a single column, zero sidebar, zero popups. Just you and the tool.</p> <h2> What's Inside </h2> <p><strong>Formatters</strong> — JSON, SQL (17 dialects), HTML, JavaScript, CSS<br> <strong>Encoders</strong> — Base64, URL, JWT decoder, YAML↔JSON, JSON↔CSV<br> <strong>Generators</strong> — Passwords, UUIDs (v1/v3/v4/v5), hashes (MD5/SHA/HMAC), QR codes, Lorem Ipsum, color palettes, CSS gradients/shadows/grids, meta tags, robots.txt, .gitignore<br> <strong>Testing &amp; Debugging</strong> — Regex tester, diff checker, webhook tester, cURL→code, HTTP status reference, cron expression builder<br> <strong>Converters</strong> — Unix timestamps, hex↔RGB, binary, SVG→JSX, JSON→TypeScript, HTML playground, markdown editor<br> <strong>Network</strong> — DNS lookup, SSL checker, IP lookup, QR code decoder, IBAN validator</p> <h2> Why I Built It This Way </h2> <p>Most "free" dev tools follow the same pattern: create an account, hit a rate limit, and wonder if your data is being stored somewhere.</p> <p>KRUMB.DEV flips that:</p> <ul> <li> <strong>Everything runs in your browser</strong> — JSON, JWT, source code, passwords never touch a network request</li> <li> <strong>Zero accounts</strong> — open the page, use the tool, leave. No signup wall between you and the output</li> <li> <strong>Clean interface</strong> — ⌘K opens a command palette to jump to any tool in seconds</li> <li> <strong>Open source</strong> — MIT license, deploy your own if you want</li> </ul> <h2> The Tech </h2> <p>Next.js, TypeScript, and Tailwind. Static-first, client-side execution for all core tools. Server routes exist only for DNS/SSL lookups and webhook proxying — things that genuinely need a network call. Everything else is just your browser doing the work.</p> <h2> How to Use It </h2> <ol> <li>Go to <a href="https://krumb-dev-five.vercel.app" rel="noopener noreferrer">krumb-dev-five.vercel.app</a> </li> <li>Press ⌘K and type the tool you need</li> <li>Paste your input, get your output, copy and move on</li> </ol> <p>That's it. No onboarding flow, no "create an account to save", no "upgrade to remove ads".</p> <h2> What's Next </h2> <p>More tools, better tools. I'm working through a backlog of ideas based on what developers actually search for — SQL formatters, CSS generators, network debugging tools. The roadmap is driven by what's useful, not what monetizes.</p> <p><em>Built by a developer, for developers. <a href="https://github.com/Shabir-Ahmad-tech/Krumbdev" rel="noopener noreferrer">Star on GitHub</a> if you find it useful.</em></p> webdev javascript opensource privacy