Generate favicon

Skill svyatov/agent-toolkit/plugins/generate-favicon/skills/generate-favicon

Personal agent toolkit — reusable skills and plugins for Claude Code, Cursor, Codex, and Gemini CLI

Install

npx -y skills add svyatov/agent-toolkit --skill generate-favicon

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Generate a minimal, modern favicon set from an SVG source — ICO, SVG with dark mode, Apple Touch Icon, PWA icons, manifest, and HTML tags. Use when the user asks to create favicons, set up site icons, add a favicon to their project, generate PWA icons, or mentions needing apple-touch-icon, manifest icons, or favicon.ico files.

SKILL.md

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Generate Favicon

Generate a complete favicon set from an SVG source file. Produces 6 files + 1 manifest that cover all modern browsers, PWAs, and legacy support.

Output Files

File	Size	Purpose
`favicon.ico`	32x32	Legacy browsers, RSS readers
`icon.svg`	vector	Modern browsers, dark mode support
`apple-touch-icon.png`	180x180	iPhone/iPad home screen
`icon-192.png`	192x192	Android home screen (PWA)
`icon-512.png`	512x512	PWA splash screen
`icon-mask.png`	512x512 (409x409 safe zone)	Android adaptive/maskable icon
`manifest.webmanifest`	—	PWA manifest with icon entries

Prerequisites

The user must have an SVG icon file. If they don't, help them create or obtain one first.

Required CLI tools (check availability before starting):

magick (ImageMagick 7+) — for ICO and PNG conversion
npx svgo — for SVG optimization (optional but recommended)

If ImageMagick is not installed, suggest: brew install imagemagick (macOS) or the platform equivalent.

Process

Step 1: Locate SVG Source and Output Directory

Ask the user which SVG file to use as the source icon. Verify:

File exists and is valid SVG
Has a viewBox attribute (needed for correct scaling)
Is roughly square (width ≈ height in viewBox)

If the SVG is not square, warn the user before proceeding.

Detect the project's static/public directory by looking for public/, static/, src/assets/, or fall back to the project root. Ask the user to confirm the output location. All generated files go into this directory.

Step 2: Add Dark Mode to SVG

Read the SVG file. If it doesn't already have a prefers-color-scheme: dark media query, ask the user if they want dark mode support.

If yes:

Identify the actual fill/stroke colors used in the SVG (inspect <path>, <circle>, <rect>, etc.)
Propose specific dark-mode color swaps based on what's in the file — don't assume hardcoded values
Add a <style> block inside the <svg> element with the swaps:

<style>
  @media (prefers-color-scheme: dark) {
    .favicon-dark { fill: #PROPOSED_LIGHT_COLOR }
  }
</style>

Add the class to the relevant elements and ensure their default fill/stroke is set for light mode

If the SVG already uses CSS variables or classes, adapt to its existing structure rather than adding a parallel system.

Save the result as icon.svg in the output directory.

Step 3: Optimize SVG

Run SVGO before generating PNGs — optimized SVGs produce cleaner rasterizations:

npx svgo --multipass icon.svg

Step 4: Generate All Image Files

Run these commands in parallel:

# favicon.ico (32x32)
magick "$SVG" -resize 32x32 favicon.ico

# apple-touch-icon.png (180x180 with 20px padding)
magick "$SVG" -resize 140x140 -gravity center -background white -extent 180x180 apple-touch-icon.png

# icon-192.png
magick "$SVG" -resize 192x192 icon-192.png

# icon-512.png
magick "$SVG" -resize 512x512 icon-512.png

# icon-mask.png (409x409 content in 512x512 canvas)
magick "$SVG" -resize 409x409 -gravity center -background white -extent 512x512 icon-mask.png

Adjust the -background color for apple-touch-icon.png and icon-mask.png to match the user's brand color if they specify one.

Step 5: Create Web App Manifest

Write manifest.webmanifest:

{
  "name": "SITE_NAME",
  "icons": [
    { "src": "/icon-192.png", "type": "image/png", "sizes": "192x192" },
    { "src": "/icon-mask.png", "type": "image/png", "sizes": "512x512", "purpose": "maskable" },
    { "src": "/icon-512.png", "type": "image/png", "sizes": "512x512" }
  ]
}

Replace SITE_NAME with the actual project/site name. Ask the user if not obvious from context.

Step 6: Add HTML Tags

Add favicon tags to the project. The approach depends on the framework:

Framework	Icon files go in	HTML/meta location
Next.js (App Router)	`app/` or `public/`	`app/layout.tsx` via metadata API (`icons` export)
Astro	`public/`	`src/layouts/*.astro` `<head>`
Vite / SPA	`public/`	`index.html` `<head>`
Static HTML	project root	`index.html` `<head>`

For frameworks using raw HTML tags in <head>:

<link rel="icon" href="/favicon.ico" sizes="32x32">
<link rel="icon" href="/icon.svg" type="image/svg+xml">
<link rel="apple-touch-icon" href="/apple-touch-icon.png">
<link rel="manifest" href="/manifest.webmanifest">

For Next.js App Router, use the metadata API instead of raw tags — either place icons in app/ with convention names or export an icons object from layout.tsx.

Step 7: Verify

Confirm all files exist and are non-empty:

ls -la favicon.ico icon.svg apple-touch-icon.png icon-192.png icon-512.png icon-mask.png manifest.webmanifest

Suggest the user validate the maskable icon at https://maskable.app.

Important Notes

Never use rel="shortcut icon" — it was never valid; use rel="icon"
Place favicon.ico at site root — some tools (RSS readers) request /favicon.ico directly
Trust browser downscaling — no need for 20+ size variants
Safari pinned tab SVG (mask-icon) — deprecated since Safari 12, not needed
Windows tile icons — not needed for modern Edge/Windows
Favicon downloads happen in the background and don't affect page load performance