Hey Product Hunt 👋 I built the CSS Toolkit because I kept hitting the same friction every day as a frontend developer. Mid-build, mid-thought, and I'd have to stop to convert a px value, tweak a box shadow by guessing values and refreshing the browser, or look up nth-child syntax for the fifth time that month. None of it is hard. All of it is a context switch that breaks focus. So I built 8 tools to eliminate that loop: → PX to REM Converter: with configurable root size and bulk conversion → PX to EM Converter: context-aware, specify parent font size → Box Shadow Generator: live visual editor, multiple layers, copy-ready CSS → Border Radius Generator: per-corner control including elliptical syntax → Text Shadow Generator: stacked layers, live preview → CSS Animation Generator: keyframes + shorthand output, live preview → JWT Decoder: paste token, get decoded header and payload instantly → nth-child Tester: type any expression and see which elements match live Three things I got right from the start: Everything runs in the browser. No server. No data collection. What you type stays on your machine. No login, no signup, no free tier with limits. Just open and use. 100/100 PageSpeed scores on every tool page. The hardest part has not been building; it's been getting developers to find it. That's honestly why I'm here today. If you use CSS daily, try it: csstoolkit.net Would love feedback on what's missing or what could be better. What CSS task do you still do manually that you wish had a tool?

CSS Toolkit

8 free CSS tools. No login. No nonsense. Runs in browser

8 free CSS tools. No login. No nonsense. Runs in browser