I Built 15 Free Browser-Based Developer Tools — Here's What I Learned

Every developer has that moment: you need to quickly format some JSON, generate a UUID, or encode a string to Base64. You google it, click the first result, and get hit with cookie banners, newsletter popups, and a loading spinner while 3MB of JavaScript downloads to do something that takes 5 lines of code. I decided to fix this by building ToolPry — a collection of 15 developer tools that are fast, private, and free. The Rules I Set for Myself Every tool must run 100% in the browser. No server calls. No APIs. Your data never leaves your machine. No frameworks. Each tool is a single HTML file with inline CSS and JS. No React, no Tailwind, no build step. No tracking. No Google Analytics, no Hotjar, no cookies (except for ads). No sign-up. Every tool is fully functional for everyone, immediately. Must work offline. Service worker caches everything after first visit. The 15 Tools Here's what I built: Data & Encoding JSON Formatter & Validator — Format, validate, minify with syntax highlig