First CH Apps / Favicon Checker
Enter a URL and we collect every icon the page declares (favicon.ico, link rel=icon, apple-touch-icon and the Web App Manifest icons), then fetch each one to confirm its real format, dimensions and weight. For ICO files we read every size packed inside.
Generating icons is the job of the favicon generator on First CH Tools (fully in-browser). Browsers cannot fetch another site's URL directly (CORS), so this server-side app takes over the checking half.
Need to generate icons? Favicon generator (tools.first-ch.com, in-browser)Sent: only the URL you type. Our server (Cloudflare Workers) fetches that URL as a public page, then fetches the icons it declares (up to 12) and the manifest.
Stored: nothing. The check lives entirely inside one request and writes neither the URL nor the result to any database (no KV, no D1). It leaves memory when the request ends.
Returned: the declarations we found (rel, sizes, type) plus whether each icon loaded, its format, real dimensions and weight. We never re-serve the fetched HTML, manifest or images (preview images are loaded by your browser directly from the source site).
Note: public GET only. URLs pointing at internal networks, localhost or private IPs are rejected, and pages behind a login cannot be checked.
POST /favicon-check/api/inspect with JSON ({"url": "https://example.com/"}) or a form body and you get the same report back as JSON.
Browsers cache favicons aggressively. Right after replacing one, verify with a changed filename or a hard reload.