Sada Files
  1. 1Choose file
  2. 2Adjust
  3. 3Download

Check a public page

Enter a URL in the settings and run the check. Our server fetches the page through an SSRF-safe fetcher, analyses it in memory and stores nothing.

Fetched by our server — public addresses only, nothing stored or logged.

Canonical Tag & Loop Inspector online, free

Verify canonical URL tags, detect self-referential links, cross-domain mismatches, loop redirects, and HTTP canonical headers.

  • Runs in your browser — no upload
  • Free, no sign-up, no watermark
  • HTML
  • TXT
How to use Canonical Tag & Loop Inspector · Canonical Tag & Loop Inspector — frequently asked questions

How to use Canonical Tag & Loop Inspector

  1. 1

    Add your HTML and TXT file

    Drop a file on the page, paste it, or click Select Files. Nothing is uploaded — it opens straight in your browser.

  2. 2

    Fine-tune the settings

    Set source mode in the Fine-tune panel, or keep the defaults — they suit most files.

  3. 3

    Run Canonical Tag & Loop Inspector

    Press the start button. Processing happens on your device, usually in seconds.

  4. 4

    Download the result

    Save the finished file, or continue with another tool without downloading in between.

What Canonical Tag & Loop Inspector can do

  • Source Mode: url and paste
  • Private by design — files are processed in your browser and never uploaded
  • Free with no sign-up, no watermark and no daily limit

Canonical Tag & Loop Inspector — frequently asked questions

What is a canonical tag and why is it critical for SEO?

A canonical tag (`<link rel="canonical" href="...">`) tells search engines which version of a URL represents the primary, authoritative source. It prevents duplicate content penalties when pages are accessible via multiple query parameters, protocols (HTTP vs HTTPS), or subdomains (www vs non-www).

What canonical issues does this tool detect?

This inspector flags missing canonical tags, relative URLs used where absolute URLs are required, cross-domain canonical mismatches, self-referential loop errors, and conflicting canonical links defined both in the HTML `<head>` and the HTTP `Link` response header.

Can I inspect canonical tags on staging HTML before publishing?

Yes. Paste the HTML into the Paste mode tab to inspect `<link rel="canonical">` elements locally in your browser before deployment.

What happens if a canonical tag points to a redirected or 404 URL?

Search engines may disregard canonical tags that point to error pages or redirect chains, causing indexing confusion and loss of ranking signals. Our tool alerts you whenever canonical destination discrepancies are detected.

Are my checked URLs tracked or stored?

No. Sada Files does not log URLs, IP addresses, or page content. Processing is ephemeral, privacy-first, and zero-retention.

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