Favicon Checker
Quick answer
Enter a page URL—the tool fetches declared icons and summarizes what browsers are likely to pick up.
For a related estimate, see Image Color Palette Extractor.
Explore further: Color Name Identifier · Accessible Color Palette
Caches
Browsers cache favicons aggressively—after fixes, hard-refresh or use a cache-busting query on the asset URL.
Explore further: Color Blindness Simulator · Ai Api Cost Calculator
Favicons appear in tabs and bookmarks; correct `<link rel="icon">` tags avoid blank or blurry icons. Use it after deploy or when rebranding. See also Favicon generator for a related utility in this cluster.
How to use this calculator
- Open the tool: Paste a public URL.
- Tune inputs: Run the check and read which icon links resolve.
- Read the output: Fix HTML or asset paths in your framework’s head config.
Real-world examples
- Missing 32×32: Some platforms still request classic sizes—provide multiple PNGs or a well-formed ICO.
- SVG favicon: Supported in modern browsers—keep a PNG fallback for older engines if needed.
Tips & gotchas
Ship a maskable icon for PWAs separately—don’t assume one square asset works everywhere.
FAQ
Does it crawl SPAs only?
It reads the HTML you point at—ensure your head tags are server-rendered or prerendered for accuracy.
Does this tool send my text to a server?
Calciverse runs in your browser; we do not store your inputs on our servers for these utilities. Anything that uses network APIs (for example DNS lookup) only sends what you explicitly request.
Why do results differ from another site?
Rounding, defaults, and implementation details (color spaces, tokenizers, DNS resolvers) can differ. Compare definitions, not just the headline number.