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Michael Lip
Michael Lip

Posted on • Originally published at zovo.one

Using Emoji as Favicons: The One-Line SVG Trick

#webdev #design #beginners #programming

You are building a side project and need a favicon. You do not have a logo. Designing one takes time you do not want to spend. Here is a trick that takes 10 seconds: use an emoji as your favicon with a single line of HTML.

<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🚀</text></svg>">
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That is it. No image file. No build step. No asset management. A rocket emoji as your favicon.

How it works

The favicon is a data URI containing an inline SVG. The SVG contains a text element with the emoji character. The browser renders the SVG (including the emoji text) as the favicon.

Breaking it down:

  • data:image/svg+xml, tells the browser this is an inline SVG
  • The SVG has a 100x100 viewBox
  • The text element places the emoji at vertical position 0.9em with font size 90 (to fill most of the viewBox)
  • The comma and angle brackets need proper encoding in the href

Browser support

This works in all modern browsers: Chrome, Firefox, Safari, Edge. It does not work in IE11 (which is effectively dead) or very old mobile browsers.

The emoji rendering uses the system emoji font, which means the favicon will look slightly different on macOS (Apple Color Emoji), Windows (Segoe UI Emoji), and Android (Noto Color Emoji). This is usually fine for side projects and development.

Limitations

No IE/legacy support: Very old browsers need an ICO file. If you need to support them, this approach needs a fallback.

Emoji varies by platform: The same emoji code point renders differently on different operating systems. A face emoji on macOS looks different from the same emoji on Windows.

Size constraints: At 16x16 or 32x32 pixels (favicon rendering sizes), complex emoji lose detail. Simple, bold emoji work best: shapes, animals, common objects.

Tab visibility: Some emoji are hard to see at favicon size, especially if they have thin lines or neutral colors. Test at actual tab size.

Good emoji choices for favicons

Emoji that work well at small sizes:

  • Geometric shapes: ⚡ 🔥 💎 🎯 ⭐ 🔮
  • Bold objects: 🚀 🎵 📦 🔧 💻 📱
  • Nature: 🌊 🌲 🌸 🍀 🌙 ☀️

Emoji that work poorly:

  • Complex scenes: 🏙️ 🎠 🗽 (too much detail)
  • Light colors: 🤍 ☁️ (invisible on white tabs)
  • Very detailed: 🦋 🎨 🧬 (detail lost at 16px)

Programmatic generation

If you want to generate emoji favicons dynamically (for example, showing different emoji based on page state), you can set it with JavaScript:

function setEmojiFavicon(emoji) {
  const svg = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><text y=".9em" font-size="90">${emoji}</text></svg>`;
  const link = document.querySelector('link[rel="icon"]')
    || document.createElement('link');
  link.rel = 'icon';
  link.href = `data:image/svg+xml,${encodeURIComponent(svg)}`;
  document.head.appendChild(link);
}

// Show a checkmark when the build passes
setEmojiFavicon('✅');
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This is useful for development tools, dashboards, and notification-style feedback in the browser tab.

The generator

For a visual emoji favicon picker with preview at actual favicon size, I built a favicon emoji generator that lets you browse emoji, preview them as favicons, and copy the HTML tag or download the file.

I'm Michael Lip. I build free developer tools at zovo.one. 500+ tools, all private, all free.

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