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Bulk up to 100 • Detect duplicates, UTMs, click IDs

Query String Checker

Paste URLs — we’ll parse query parameters, spot duplicates, UTMs, click IDs (gclid, fbclid), and session-like parameters that can cause duplicate pages.

Paste up to 100 URLs (one per line)
Tip: For SEO, avoid session IDs and duplicated tracking params. Prefer canonical URLs or parameter handling rules.

Results

Host Query details Params Dup Len Issues
Run a check to see results here.
“Dup” = number of duplicated parameter keys (same key appears more than once).

Quick interpretation

Query parameters can create duplicate URLs. Trackers and session IDs are the main risk.

  • OK short query, clean params, no duplicates
  • Warning UTMs/click IDs, duplicates, empty values, very long query
  • Error invalid URL

FAQ

What does “query string” mean?

A query string is the part of a URL after the ?. It contains parameters written as key=value pairs separated by &. Example: /page?utm_source=google&id=123.

Does this tool fetch pages or crawl websites?

No. This is a local parser: it only analyzes the URLs you paste. It does not request the website, so results are instant and safe for bulk checks.

Why are UTM parameters flagged?

UTM tags (utm_source, utm_medium, etc.) are useful for analytics, but they often create multiple URL variants for the same page. If search engines index those variants, you can get duplicate pages and wasted crawl budget.

Typical fix: canonical to the clean URL and/or configure parameter handling rules in your SEO stack.

What are click IDs like gclid / fbclid / msclkid?

These are ad platform tracking IDs added to URLs after a click (Google Ads, Facebook, Microsoft Ads, etc.). They’re normal for paid traffic, but for SEO you usually want to prevent indexing of those tracking variants.

Why are duplicate keys a problem?

Duplicate keys mean the same parameter appears multiple times (example: ?sid=AAA&sid=BBB). Different systems handle duplicates differently: some keep the first, some keep the last, some merge values. That inconsistency can break tracking, caching, and canonicalization.

Why are session-like parameters marked as risky?

Session IDs and auth-like tokens can generate a “unique URL per user”. That can explode the number of crawlable URLs and produce duplicate content. In most cases you should avoid session IDs in URLs for public pages.

What does “suspicious characters” mean here?

The tool flags unusual characters in raw (encoded) query pairs (spaces, quotes, brackets, braces, pipes, etc.). This can indicate bad encoding, broken templating, copy/paste issues, or potentially unsafe input. It’s a heuristic — always review the exact URL if this warning appears.

What’s a “very long query” and why does it matter?

Extremely long query strings often come from oversized tracking payloads, serialized state, or broken scripts. They can cause caching problems, logging issues, URL truncation in some systems, and noisy indexing. If your query is consistently huge, consider moving tracking/state to cookies or POST requests where possible.