To fetch a website’s favicon, first read the page’s HTML and find its declared icon links, resolve each link against the page URL, then fetch the best usable candidate. If the page declares none or its icons fail, try the conventional /favicon.ico path at the site’s origin. For arbitrary third-party URLs, do this on a server: browser JavaScript cannot read cross-origin responses unless the target permits it with CORS.
Where a website’s favicon is declared
The most reliable starting point is the page’s <head>. Look for <link> elements whose space-separated rel value includes an icon relationship. Common values include icon, shortcut icon, apple-touch-icon, and apple-touch-icon-precomposed. The standard relationship for a page icon is rel="icon"; Google’s example is <link rel="icon" href="/path/to/favicon.ico"> (Google Search Central; MDN rel reference).
Do not assume the file is named favicon.ico, sits beside the page, or is hosted on the same domain. An href can be a relative path, an absolute URL, or a CDN URL. A root-relative path such as /icons/site.png resolves from the host root; a path such as icons/site.png resolves relative to the document URL. Resolve it with URL rules before making the icon request.
Fetch from a URL: the reliable sequence
- Validate the input. Parse it as a URL and accept only
http:orhttps:. Reject malformed input and other schemes. - Fetch the HTML. Request the page with a timeout and a maximum response size. Prefer a server-side request when the page belongs to another origin.
- Parse icon links. Inspect the document’s link elements and tokenize
relon whitespace; do not compare the full attribute to one exact string. - Resolve and assess candidates. Resolve each non-empty
hrefagainst the final page URL. Consider the declaredsizes,type, andmediahints. - Fetch and validate the selected icon. Follow only a bounded number of redirects. Check the HTTP status, response size, media type, and that the bytes can actually be decoded as an image.
- Try the conventional fallback if needed. If no declared candidate is usable, request
/favicon.icoresolved against the page URL’s origin. - Cache a successful result. Choose a cache duration that fits your application and document it; there is no universal duration prescribed by the standards.
The HTML Standard says a user agent may fetch the URL formed by resolving /favicon.ico against an HTTP or HTTPS document when no icon link is declared. That makes the root file a sensible fallback, not a guarantee that an icon exists (WHATWG HTML Standard; MDN link reference).
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Choose among multiple icon candidates
A site may declare several icons for different devices, sizes, formats, or display conditions. Browsers use media, type, and sizes as hints when choosing. For an application, use a documented ranking policy rather than assuming the first link is best.
- Discard links with a missing, empty, or malformed
href. - Tokenize
reland accept the icon relationships your application supports. - Check whether the candidate’s
mediacondition matches the intended environment. - Prefer a format the consuming application supports, using the declared
typeas a hint rather than proof of the response format. - When a requested display size is known, prefer a candidate at least that large; otherwise choose an appropriate available size. Parse
sizesrather than treating it as a single guaranteed dimension. - Fetch candidates in ranked order and fall through if a candidate returns an error or invalid image bytes.
There is no universal ranking algorithm for every consumer. A browser tab, a mobile home-screen icon, and a 16-pixel list avatar can have different needs. Treat SVG support explicitly: it preserves vector artwork, but some downstream consumers require raster images. If raster output is required, convert only after choosing and validating an appropriate source.
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JavaScript implementation: discover a candidate URL
This browser-side example parses a page you are already allowed to read. It does not bypass CORS and returns a candidate URL rather than fetching and validating the image bytes. It intentionally leaves format support, media matching, size ranking, network limits, and validation policy to the application.
function findFaviconUrl(documentObject, pageUrl) {
const page = new URL(pageUrl);
if (page.protocol !== "http:" && page.protocol !== "https:") {
throw new Error("Only HTTP(S) page URLs are supported");
}
const accepted = new Set([
"icon",
"shortcut",
"apple-touch-icon",
"apple-touch-icon-precomposed"
]);
for (const link of documentObject.querySelectorAll("link[href]")) {
const relTokens = (link.getAttribute("rel") || "")
.toLowerCase()
.split(/s+/)
.filter(Boolean);
if (!relTokens.some(token => accepted.has(token))) continue;
const href = link.getAttribute("href");
if (!href || !href.trim()) continue;
try {
return new URL(href, page).href;
} catch {
// Ignore malformed href values and continue to the next candidate.
}
}
return new URL("/favicon.ico", page).href;
}
// For the current page only:
const candidate = findFaviconUrl(document, window.location.href);
console.log(candidate);This simple example returns the first usable declared URL; it is not a complete selector for a production service. Add explicit candidate ranking and image-fetch validation when those properties matter.
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Why browser fetches fail across origins
A page’s JavaScript can read a cross-origin fetch() response only when the target server sends CORS headers that allow the request. Setting mode: "no-cors" does not make the response readable: it produces an opaque response that JavaScript cannot inspect. That is unsuitable when you need to parse another site’s HTML or examine its image bytes (MDN Fetch metadata).
For arbitrary URLs, fetch and parse on your own server or through a controlled same-origin proxy. This avoids relying on the target site to enable browser access, but it introduces server-side request forgery (SSRF) risk: an untrusted URL might point at internal services or sensitive network addresses. Apply network controls, revalidate destinations after redirects, cap redirects and bytes, and use timeouts. A same-origin proxy needs the same protections; it is not safe merely because the browser calls your domain.
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Server-side implementation checklist
- Parse and normalize the input URL; permit HTTP and HTTPS only.
- Set a request timeout and enforce HTML and icon byte limits before buffering the full response.
- Limit redirects and re-check the final destination against your SSRF policy.
- Parse HTML with an HTML parser, not a regular expression.
- Resolve icon paths against the page URL after redirects, so relative links use the final document address.
- Check status, content type, and image decodability. A successful HTTP status alone does not establish that the body is an icon.
- Make SVG handling an explicit consumer decision.
- Return a documented “not found” or null result when declared links and the root fallback fail. Do not silently substitute an unrelated logo.
- Cache validated successes to reduce repeated origin requests. Set a deliberate cache lifetime; standards do not prescribe one.
HTML-declared icon or root fallback?
| Method | Strength | Trade-off |
|---|---|---|
| Read a declared icon link | Uses the page’s explicit choice, including a custom path, CDN, or format. | Requires fetching and parsing HTML; there may be several candidates or a broken declaration. |
Request /favicon.ico |
Simple conventional fallback when the document declares no usable icon. | May not exist or may not be the icon the page uses; requires an additional request after discovery fails. |
Troubleshooting common failures
- The browser reports a CORS error: the target does not permit your page to read its response. Fetch from a protected server-side component instead;
no-corswill not make response bytes available. - The result is a 404 or missing icon: the declared path may be stale, or the root fallback may not exist. Try remaining valid declared candidates before returning a documented no-icon result.
- The URL looks relative or points to the wrong place: resolve the raw
hrefagainst the page URL with a URL parser. Do not concatenate strings or assume the icon shares the page’s directory. - The response is HTML instead of an image: the server may have returned an error page, challenge, or redirect destination. Check status, final URL, content type, and decodability before accepting it.
- The server request hangs or downloads too much: enforce timeouts and response-byte limits, stop reading after the limit, and cap redirects.
- A URL fetch reaches a private or unexpected host: reject destinations outside your SSRF policy and revalidate after every redirect. Do not let user-controlled URLs reach internal network resources.
- An SVG works in one consumer but not another: make SVG acceptance explicit. Preserve the original when supported; otherwise rasterize through a controlled image pipeline.
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Does Google show every fetched favicon?
No. Successfully discovering and fetching an icon is separate from whether a search engine displays it. Google states that “A favicon isn’t guaranteed to appear in Google Search results, even if all guidelines are met” (Google Search Central).
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