32 Free Developer Tools I Built This Week (No Signup, Browser-Only)

I just shipped 32 new developer tools to DevTools.run — all free, all browser-based, zero signups. Here are the highlights: Writing & Productivity AI Writing Assistant — 12 templates for emails, cover letters, LinkedIn posts, tweets Resume Builder — Build a professional resume with live preview Invoice Generator — Create invoices with crypto support (SOL, BTC, ETH) Text to Speech — Convert text to audio using browser Speech API Speech to Text — Voice transcription in 13+ languages CSS & Design CSS Grid Generator — Visual grid builder with live preview Flexbox Playground — Adjust flex properties visually CSS Animation Generator — 12 animation presets with customization Color Palette Generator — Harmonious palettes using color theory Color Converter — HEX ↔ RGB ↔ HSL with sliders SVG to CSS — Convert SVG to CSS background data URI Pixel Art Editor — Draw pixel art, export as PNG Code Tools Code Formatter — Format JS, CSS, HTML, SQL SQL Formatter — Beautify SQL queries with keyword upperc