favicon-generator — Claude Code skill for site and PWA icons

---
name: favicon-generator
description: When the user wants to implement, optimize, or audit favicon and app icons. Also use when the user mentions "favicon," "app icon," "browser icon," "touch icon," "PWA icon," "favicon sizes," "apple-touch-icon," "favicon.ico," "site icon," or "tab icon." For visual system, use brand-visual-generator.
metadata:
  version: 1.0.1
---

# Components: Favicon

Guides favicon and app icon implementation for brand consistency across browser tabs, bookmarks, mobile home screens, and **Google Search results**. Favicons help users identify sites; missing or incorrect icons hurt trust.

**When invoking**: On **first use**, if helpful, open with 1-2 sentences on what this skill covers and why it matters, then provide the main output. On **subsequent use** or when the user asks to skip, go directly to the main output.

## Initial Assessment

**Project context:** Read root `contextus.md` when present and load only the modules relevant to this task. Without Contextus, use available project material or user-provided facts and ask for missing information; do not create a parallel context system.

Identify:
1. **Tech stack**: Next.js, WordPress, static HTML, etc.
2. **PWA**: Is the site a PWA or planning to be?
3. **Existing assets**: Logo, icon files

## Required Sizes

| Size | Use |
|------|-----|
| **16x16** | Browser tabs, standard displays |
| **32x32** | Retina/HiDPI browser tabs |
| **180x180** | Apple Touch Icon (iOS home screen); no transparency |
| **192x192** | Android Chrome home screen, PWA launcher |
| **512x512** | PWA splash screens, adaptive icons |

**Optional**: 48x48, 96x96, 120x120, 152x152, 167x167, 256x256 for broader coverage.

## Formats

| Format | Use |
|--------|-----|
| **SVG** | Modern browsers; scalable; supports dark mode via media queries; lightweight |
| **PNG** | High-DPI; explicit sizes; easy to generate; required for Apple Touch Icon |
| **ICO** | Legacy; bundles multiple sizes; fallback for older browsers |

**Recommended**: Provide SVG + PNG fallbacks. Never skip Apple Touch Icon (180x180); iOS shows a generic screenshot without it.

## Google Search (SERP Display)

See **serp-features** for SERP feature types and optimization.

Favicons can appear in Google Search results next to your site's listings. [Google Search Central](https://developers.google.com/search/docs/appearance/favicon-in-search) requirements:

| Requirement | Guideline |
|-------------|-----------|
| **Placement** | Add `<link rel="icon" href="/path/to/favicon.ico">` to **homepage** header |
| **One per hostname** | One favicon per hostname; `example.com` and `code.example.com` are separate; `example.com/sub-site` shares the same favicon |
| **Crawlability** | Googlebot-Image must crawl favicon; Googlebot must crawl homepage; do not block either in robots.txt |
| **Shape** | Square (1:1 aspect ratio); minimum 8x8px; **preferably >48x48px** for quality across platforms |
| **Stable URL** | Do not change favicon URL frequently |
| **Appropriate** | No inappropriate content (pornography, hate symbols); Google may replace with default icon |
| **Timing** | Crawling can take days to weeks; use Search Console URL Inspection to request indexing |

**Supported rel values**: `icon`, `shortcut icon`, `apple-touch-icon`, `apple-touch-icon-precomposed`. **href** can be relative (`/favicon.ico`) or absolute; favicon can be hosted on CDN.

## Implementation

### HTML Link Tags

```html
<link rel="icon" href="/favicon.ico" sizes="any">
<link rel="icon" href="/icon.svg" type="image/svg+xml">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32.png">
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
```

### Next.js

Place in `/app`: `favicon.ico`, `icon.png`, `apple-icon.png`. Next.js auto-generates tags.

### PWA Manifest

Include `icons` array in `manifest.json` with 192x192 and 512x512 for maskable icons.

## Best Practices

- **Simplicity**: At 16x16, complex details are illegible; use simplified logo mark; design for brand recognition in SERPs
- **Consistency**: Favicon should match logo/brand (logo-generator, brand-visual-generator)
- **Cache**: Use long cache; version for updates (e.g. `/favicon.ico?v=2`)
- **Tools**: RealFaviconGenerator, favicon.io, or favicons npm package for automation
- **Test**: Check across browsers, dark mode, and Search Console (favicon may take days to weeks to appear)

## Output Format

- **Size** checklist (16, 32, 180, 192, 512; >48x48 for Google Search)
- **Format** recommendations (SVG, PNG, ICO)
- **Implementation** notes per tech stack (homepage header placement)
- **Google Search** checklist (crawlability, stable URL, appropriate content)
- **Manifest** (if PWA)

## Related Skills

- **logo-generator**: Favicon typically derived from logo; consistent branding
- **media-kit-page-generator**: Media kit should include favicon or link to brand assets
- **brand-visual-generator**: Visual identity; favicon aligns with brand colors and mark
- **indexing**: Favicon requires crawlable homepage; URL Inspection for indexing