Campaign URL Parameter Comparison Calculator

What this compares

The tool compares selected, case-sensitive query parameter names and decoded values in two supplied HTTP(S) URLs. It does not visit them, follow redirects, inspect a tag or send the input as part of its report. Use synthetic or sanitised examples only; do not include personal information, click IDs, credentials, confidential links or sensitive parameter names.

Rules and denominator

Exactly one nonblank start value makes a name expected. An unchanged decoded final value is preserved; an absent final name is missing; a changed value is changed; duplicate or blank final values are ambiguous. A missing or duplicate/blank start value is excluded from the denominator; a name only in the final URL is added. Fragments are not query parameters. Names and values are case-sensitive, and values are not trimmed for equality. Percent = preserved ÷ expected, unavailable when no names are expected.

Synthetic example

Three selected names are expected. Two are preserved and one changes from email to Email, giving 2/3 or 66.7%. This is a share of selected names in one pair of snapshots, not a share of visits. Use the review worksheet to inspect the journey and the optional prompt for a human-checked handoff.

What it cannot establish

A final URL can differ from the URL available when a tag ran. Compare the relevant stage in an approved test, inspect the first differing hop, and consider consent, blockers and other causes. A preserved parameter does not prove a correctly attributed session.

Sources and limits

Checked 5 November 2026: Google's direct-traffic guidance notes that redirects can strip UTM parameters and gives other causes of direct traffic. Its clicks and sessions troubleshooting guide explains that the metrics differ and lists other collection issues. Microsoft Advertising documents tracking templates and final URLs for its own platform. The review method below is an original synthesis, not a platform guarantee.