Agent skill

favicon-gen

Generate custom favicons from logos, text, or brand colours. Produces all required formats: favicon.svg, favicon.ico, apple-touch-icon.png, icon-192/512.png, and web manifest. Use when initialising websites, replacing CMS default favicons, converting logos to favicons, creating branded icons from initials, or troubleshooting favicon not displaying, iOS black square, or missing manifest.

Stars 670
Forks 52

Install this agent skill to your Project

npx add-skill https://github.com/jezweb/claude-skills/tree/main/plugins/design-assets/skills/favicon-gen

SKILL.md

Favicon Generator

Generate a complete favicon package from a logo, initials, or brand colours. Produces all required formats and HTML integration code.

Workflow

Step 1: Choose Your Approach

Have a logo with an icon element?
 YES -> Extract icon from logo
 NO  -> Have text/initials?
         YES -> Create monogram favicon
         NO  -> Use branded shape

Step 2: Create Source SVG

Extracted icon — copy icon paths from logo, centre in 32x32 viewBox, simplify for small sizes.

Monogram — use a template from assets/:

xml
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
  <circle cx="16" cy="16" r="16" fill="#0066cc"/>
  <text x="16" y="21" font-size="16" font-weight="bold"
        text-anchor="middle" fill="#ffffff" font-family="sans-serif">AC</text>
</svg>

Branded shape — circle (universal), rounded square (modern), shield (security), hexagon (tech).

SVG templates available in assets/ directory.

Step 3: Generate All Formats

Requires ImageMagick (convert command). Install if needed: brew install imagemagick (macOS) or apt install imagemagick (Linux).

bash
# ICO (16x16 + 32x32)
convert favicon.svg -define icon:auto-resize=16,32 favicon.ico

# Apple Touch Icon (180x180, SOLID background — transparent = black on iOS)
convert favicon.svg -resize 180x180 -background "#0066cc" -alpha remove apple-touch-icon.png

# Android/PWA icons
convert favicon.svg -resize 192x192 icon-192.png
convert favicon.svg -resize 512x512 icon-512.png

No ImageMagick? Use https://favicon.io to convert from the SVG instead.

Step 4: Create Web Manifest

Copy and customise assets/manifest.webmanifest:

json
{
  "name": "Your Business Name",
  "short_name": "Business",
  "icons": [
    { "src": "/icon-192.png", "sizes": "192x192", "type": "image/png" },
    { "src": "/icon-512.png", "sizes": "512x512", "type": "image/png" }
  ],
  "theme_color": "#0066cc",
  "background_color": "#ffffff",
  "display": "standalone"
}

Step 5: Add HTML Tags

html
<link rel="icon" type="image/svg+xml" href="/favicon.svg">
<link rel="icon" type="image/x-icon" href="/favicon.ico">
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
<link rel="manifest" href="/site.webmanifest">
<meta name="theme-color" content="#0066cc">

Place all files in site root (/public/ in Vite/React).


Critical Rules

  • Always generate ALL formats — SVG, ICO, apple-touch-icon, 192, 512, manifest
  • iOS icons MUST have solid backgrounds — transparent = black square
  • Always use bold font weight for monogram text (regular disappears at 16x16)
  • Test at 16x16 — if it's not legible, simplify
  • Never launch with CMS defaults (WordPress "W", etc.)

Format Quick Reference

Format Size Transparency Purpose
favicon.svg Vector Yes Modern browsers
favicon.ico 16+32 Yes Legacy browsers
apple-touch-icon.png 180x180 No iOS home screen
icon-192.png 192x192 Yes Android
icon-512.png 512x512 Yes PWA

Asset Files

  • assets/favicon-svg-circle.svg — Circle monogram template
  • assets/favicon-svg-square.svg — Rounded square template
  • assets/favicon-svg-shield.svg — Shield template
  • assets/manifest.webmanifest — Web manifest template

Reference Files

  • references/format-guide.md — Complete format specifications
  • references/extraction-methods.md — Logo icon extraction steps
  • references/monogram-patterns.md — Advanced monogram design
  • references/shape-templates.md — Industry-specific shapes with SVG code

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