I Built 50+ Free Developer Tools in One Night — Here Are the Best Ones

Last night I went on a building spree and shipped 50+ new tools to DevTools.run . Every tool runs entirely in your browser — no backend, no signup, no tracking. Here are the ones developers are loving most: Must-Have Dev Tools CSS Grid Generator — Visual grid builder with live preview. Adjust columns, rows, gap, and sizes. Copy the generated CSS. Flexbox Playground — Every flexbox property with instant visual feedback. CSS Glassmorphism Generator — Beautiful frosted glass effects with adjustable blur, opacity, and saturation. CSS Animation Generator — 12 presets (bounce, pulse, shake, spin, etc.) with full customization. HTML to JSX — Paste HTML, get valid React JSX. Handles className, style objects, self-closing tags. Regex Tester — Real-time match highlighting with presets for email, URL, IP, phone. Code Formatter — Format JS, CSS, HTML, SQL with one click. Surprisingly Popular Resume Builder — Fill in sections, see live preview in 3 templates, export as text. Invoice Generator — Cre