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HTML/CSS/JS tools

Format and minify HTML, CSS, and JavaScript, convert colors and units, and generate CSS snippets. Formatting only; nothing is executed. Browse all 31 HTML/CSS/JS tools with no upload and no account.

  • HTML Formatter: Format HTML online free with pretty-print indentation. Beautify minified markup in your browser, no upload, no account required.
  • HTML Minifier: Online HTML minifier - compress HTML in your browser by removing comments and whitespace. No upload, no account required. Runs locally.
  • CSS Formatter: Format and beautify CSS online in your browser. Pretty-print minified stylesheets with custom indentation. No upload, no account, privacy-first.
  • CSS Minifier: Free online CSS minifier - compress stylesheets by removing comments and whitespace. Runs locally in your browser, no upload, no account required.
  • JavaScript Formatter: Format JavaScript online in your browser with custom indentation. Free, no upload, no account. Pretty-print minified JS as text only - code never executed or stored.
  • JavaScript Minifier: Free JavaScript minifier that runs browser-local. Minify JS by removing comments and whitespace. No upload, no account, no code execution.
  • Color Picker: Free online color picker for HEX, RGB, HSL, HSV, and OKLCH. Pick a color and inspect all formats instantly in your browser. No upload, no account.
  • Color Converter: Free hex to rgba converter: Convert HEX, RGB, HSL, HSV, and approximate OKLCH instantly in your browser. No upload, no account, no data stored.
  • Complementary Colors: Complementary color generator: find opposite hues and evenly spaced palettes from any seed color in your browser. No upload, no account, runs locally.
  • Color Palette Generator: Free hex color palette generator using analogous, triadic, and tetradic color schemes. Build harmonious palettes from one seed color in your browser, no upload or account.
  • Tint and Shade Generator: Free colour shade generator. Create lighter tints and darker shades from any base color using HSL lightness steps. Copy HEX, RGB, HSL, HSV, OKLCH. Browser-local, no upload, no account.
  • Color Blindness Simulator: Simulate protanopia, deuteranopia, or tritanopia for one color. See how colorblind people perceive your design. Browser-local, no upload, free.
  • HEX to RGBA: Hex to rgba converter: paste HEX, RGB, or HSL and adjust alpha from 0 to 1 for instant rgba() output. Local browser processing, no upload.
  • Tailwind Palette Generator: Free shade generator for Tailwind. Generate a 50-950 color palette from one seed color locally in your browser. HEX, RGB, HSL, HSV, OKLCH. No upload, no account.
  • Random Accessible Palette: Generate random accessible color palettes with WCAG contrast checks. HEX, RGB, HSL, HSV, OKLCH formats. Browser-local, no upload.
  • CSS Gradient Generator: Free CSS gradient generator for linear-gradient backgrounds. Set angle 0-360deg, color stops in HEX/rgb/hsl, and preview live. Runs locally in your browser.
  • Box Shadow Generator: Free CSS box shadow generator with live preview. Adjust offset, blur, spread, color locally in your browser. No upload, no account required.
  • Border Radius Generator: Free border radius generator online. Create rounded corners CSS locally in your browser, set uniform or individual corner radii, preview live, copy CSS. No upload, no account.
  • rem to px Converter: Convert rem to px or px to rem with custom root font size. Enter 1.25rem, 3rem, or any value and get instant results in your browser - no upload, no account.
  • CSS Unit Converter: Free CSS unit converter: convert px, rem, em, vw, vh, % locally in your browser. Set root font size and viewport width. No upload, no account required.
  • Aspect Ratio Calculator: Free aspect ratio calculator for CSS aspect-ratio property. Enter 16:9 or pixel dimensions to get simplified ratios, CSS declarations, and responsive sizing, all in your browser, no upload.
  • CSS Specificity Calculator: CSS specificity calculator: score selectors as (a,b,c) tuples and compare them to debug cascade conflicts. Free, browser-local, no upload.
  • CSS Filter Generator: CSS filter online generator. Adjust blur, brightness, contrast, saturate, grayscale with live preview. Copy or download filter.css. Browser-local, no upload, no account.
  • Meta & OG Tags: Generate Open Graph and Twitter Card meta tags as escaped HTML text locally. Free browser tool, no upload, no account needed.
  • robots.txt Generator: Create robots.txt online free. Generate robots.txt files locally in your browser with user-agent, allow, disallow, and sitemap fields. No upload or account needed.
  • SVG to Data URI: Free SVG to data URI converter. Browser-local, no upload. Convert SVG to inline data:image/svg+xml URLs for CSS, img src, and webpack.
  • Image to Base64: Free image to base64 converter. Convert PNG, JPG, GIF, WebP to data URLs in your browser. No upload, no account.
  • Favicon Emoji Data URI: Convert emoji to SVG favicon data URI in your browser. Generate copy-ready link rel icon code locally, no upload or account needed.
  • HTML to Markdown: Format HTML online to Markdown instantly. Free browser-based converter, no upload needed. Convert HTML tags to Markdown locally, safe, private, no account.
  • Markdown to HTML: Convert Markdown to HTML online, free and locally in your browser. Escaped output displays as text, not live code. No upload, no account required.
  • Lorem Ipsum Generator: Generate placeholder Lorem Ipsum paragraphs locally in your browser. Free, no upload, no account. Privacy-first developer tool.

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