Favicon Checker
Drop your favicon (ICO, PNG, SVG)
Recommended max file size 1 MB. The icon stays on your device.
Metadata
- Dimensions
- -
- Aspect ratio
- -
- Format
- -
- File size
- -
- Quality
- -
- Contrast tip
- -
Browser preview
Light tab
swapcode.ai
/dashboard
Dark tab
swapcode.ai
/dashboard
Recommended HTML snippet
How It Works
- Step 1: Upload favicon file in ICO, PNG, SVG, WebP, or JPEG format from local disk or provide URL to existing favicon for analysis.
- Step 2: The checker reads image metadata extracting dimensions (width x height), file size in bytes/KB, color depth, and format type using browser Image API.
- Step 3: Validates favicon specifications checking for square aspect ratio (16x16, 32x32, 48x48, 64x64, 128x128, 256x256), optimal file size (under 100KB), and format compatibility.
- Step 4: Displays preview showing how favicon appears in browser tabs, bookmarks, and mobile home screens, with recommendations for multi-resolution favicon.ico or SVG format.
Manual vs Automated Favicon Validation
| Feature | Manual Checking | AI-Powered Checker |
|---|---|---|
| Dimension Validation | Manually check image properties | Instant dimension analysis (16x16-256x256) |
| Format Detection | Check file extension manually | Auto-detects ICO, PNG, SVG, WebP, JPEG |
| File Size Check | Look at file properties | Instant size analysis with optimization tips |
| Multi-Resolution | Manually extract ICO layers | Shows all resolutions in ICO files |
| Browser Preview | Upload to test server | Instant preview in browser context |
| Recommendations | No automated guidance | Best practices for modern browsers |
Favicon Validation Examples
Example: Favicon Analysis
Uploaded Files:
File 1: favicon.ico
Format: ICO (Microsoft Icon)
Size: 15.2 KB
Contains: Multiple resolutions (16x16, 32x32, 48x48)
File 2: favicon.png
Format: PNG (Portable Network Graphics)
Dimensions: 512x512 pixels
Size: 45.8 KB
Color Depth: 32-bit (RGBA)
File 3: favicon.svg
Format: SVG (Scalable Vector Graphics)
Size: 2.1 KB
Scalable: Yes (vector format)Validation Report:
✅ File 1: favicon.ico (RECOMMENDED)
Format: ICO ✓
Size: 15.2 KB ✓ (under 100KB limit)
Resolutions Included:
- 16x16 ✓ (browser tabs)
- 32x32 ✓ (taskbar, bookmarks)
- 48x48 ✓ (Windows desktop shortcuts)
Aspect Ratio: Square ✓
Transparency: Supported ✓
Browser Support: All browsers ✓
Preview:
Browser Tab: [16x16 icon preview]
Bookmark: [32x32 icon preview]
Desktop Shortcut: [48x48 icon preview]
Recommendation: ✅ Perfect for broad compatibility
⚠️ File 2: favicon.png (NEEDS OPTIMIZATION)
Format: PNG ✓
Dimensions: 512x512 ⚠️ (too large for favicon)
Size: 45.8 KB ✓ (acceptable)
Aspect Ratio: Square ✓
Transparency: Supported (RGBA) ✓
Browser Support: Modern browsers ✓
Issues:
- 512x512 is excessive for favicon display
- Browsers will downscale, wasting bandwidth
- Recommended: 32x32, 64x64, or 180x180 (Apple Touch Icon)
Optimization:
Resize to 32x32: ~2 KB (85% size reduction)
Resize to 64x64: ~5 KB (89% size reduction)
Recommendation: ⚠️ Resize to appropriate dimensions
✅ File 3: favicon.svg (MODERN APPROACH)
Format: SVG ✓
Size: 2.1 KB ✓ (excellent, smallest)
Scalable: Yes ✓ (perfect at any size)
Aspect Ratio: Square ✓
Browser Support: Modern browsers (Chrome 80+, Firefox 41+, Safari 9+) ✓
IE Support: ❌ (fallback needed)
Advantages:
✓ Single file for all resolutions
✓ Crisp at any size (retina displays)
✓ Smallest file size
✓ Easy to update (text-based)
Recommendation: ✅ Use with ICO fallback for IE
Implementation:
<link rel="icon" type="image/x-icon" href="/favicon.ico" />
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
Summary:
Best Format: SVG (with ICO fallback)
Optimal Sizes: 16x16, 32x32, 48x48 (ICO), 180x180 (Apple)
Total Size: <20 KB recommended
Browser Support: Use multiple formats for compatibilityKey Changes:
The checker validates favicon specifications for optimal browser display and performance. ICO format with multiple resolutions (16x16, 32x32, 48x48) provides broad compatibility—older browsers and Windows desktop shortcuts require ICO. The 512x512 PNG is flagged as oversized—browsers display favicons at 16x16 or 32x32, so large dimensions waste bandwidth without visual benefit. Optimal PNG sizes are 32x32 for standard displays, 64x64 for retina displays, and 180x180 for Apple Touch Icons (iOS home screen). SVG favicons are ideal for modern browsers—scalable to any size, smallest file size (~2KB), and crisp on retina displays. However, SVG lacks IE support, requiring ICO fallback. The checker verifies square aspect ratio—non-square images appear distorted in browser tabs. Transparency support (RGBA, alpha channel) is checked—important for favicons on dark browser themes. File size validation ensures <100KB limit—large favicons slow page load and waste bandwidth for minimal visual impact. The checker previews how the favicon appears in different contexts: browser tabs (16x16), bookmarks (32x32), Windows shortcuts (48x48), and mobile home screens (180x180). Web developers use favicon checkers to ensure proper display across browsers, optimize file sizes, and verify multi-resolution support before deployment.
Frequently Asked Questions
Which favicon formats can I upload?
You can upload ICO, PNG, JPG, WebP, and SVG files. Browsers that support the format will display an instant preview; otherwise the tool will still analyze basic metadata.
Does the tool check all sizes inside an ICO?
Modern browsers expose only the primary image within an ICO when loaded via the Image API. The tool reports the size of the first icon and flags when a high-resolution PNG (180px+) is missing.
Can I see how it looks on light and dark tabs?
Yes. The preview card shows your favicon on both light and dark backgrounds, helping you confirm contrast for Chrome, Safari, Edge, and mobile browsers.
Is my favicon sent to a server?
No. Everything happens on your device. The favicon checker runs entirely in your browser for privacy and speed.
How do I generate HTML tags for my favicon?
After validating dimensions, copy the code snippet displayed below the results and paste it into your site’s `<head>` element. It references multiple sizes for maximum compatibility.