Developer tools

All developer tools

• leej.uk/tools/contrast-checker

  

  AccessibilityLiveFree

  Contrast Checker

  WCAG 2.2 AA and AAA checks, APCA, the nearest colour that passes, and an accessible palette from one brand colour.

  • WCAG 2.2
  • APCA
  • OKLCH
  • CSS variables

  Open tool: Contrast Checker →Runs in your browser
• leej.uk/tools/fluid-type-scale

  

  TypographyLiveFree

  Fluid Type Scale

  CSS clamp() type and spacing scales that grow smoothly from phone to desktop, with a live preview at any width.

  • CSS clamp()
  • Custom properties
  • Modular scale

  Open tool: Fluid Type Scale →Runs in your browser
• leej.uk/tools/favicon-generator

  

  BrandingLiveFree

  Favicon Generator

  favicon.ico, apple-touch-icon, Android and maskable icons, a web manifest and the HTML, from text, emoji or an image.

  • favicon.ico
  • Apple touch icon
  • Web manifest
  • SVG

  Open tool: Favicon Generator →Runs in your browser
• leej.uk/tools/meta-tag-previewer

  

  SEOLiveFree

  Meta & Social Previewer

  Title and description checks, Google, X, LinkedIn and iMessage previews, and ready-to-paste meta and Open Graph tags.

  • Open Graph
  • X cards
  • Meta description
  • SEO

  Open tool: Meta & Social Previewer →Runs in your browser
• leej.uk/tools/image-compressor

  

  PerformanceLiveFree

  Image Compressor

  Convert to WebP, AVIF or JPEG, resize, make every srcset width at once, and get the <picture> code. Nothing is uploaded.

  • WebP
  • AVIF
  • srcset
  • Core Web Vitals

  Open tool: Image Compressor →Runs in your browser
• leej.uk/tools/css-shadow-gradient

  

  CSSLiveFree

  Shadow & Gradient Builder

  Layered, natural-looking box shadows and linear, radial or conic gradients with OKLCH blending, and clean CSS to copy.

  • box-shadow
  • Gradients
  • OKLCH
  • CSS

  Open tool: Shadow & Gradient Builder →Runs in your browser
• leej.uk/tools/svg-optimiser

  

  PerformanceLiveFree

  SVG Optimiser

  Safely strips editor data, scripts and whitespace, rounds numbers and shortens colours, with side-by-side previews.

  • SVG
  • Minify
  • Security
  • Icons

  Open tool: SVG Optimiser →Runs in your browser
• leej.uk/tools/robots-llms-generator

  

  SEOLiveFree

  robots.txt & llms.txt Generator

  robots.txt with AI crawler controls (training vs search), plus an llms.txt in the llmstxt.org format.

  • robots.txt
  • llms.txt
  • AI crawlers
  • SEO

  Open tool: robots.txt & llms.txt Generator →Runs in your browser
• leej.uk/pingai

  

  AI visibilityLiveFree

  PingAI

  Can ChatGPT, Claude, Perplexity, Gemini and Copilot reach and read your site? A score out of 100 with plain-English fixes.

  • AI crawlers
  • robots.txt
  • JSON-LD

  Open PingAI: PingAI →Runs on leej.uk