UTM Tracking for WordPress Forms - Capture Source, Medium & Campaign

UTM parameters are the standard way to tag marketing URLs. When a visitor clicks a link like yoursite.com/?utm_source=google&utm_medium=cpc&utm_campaign=spring_sale, those three parameters tell you the traffic source, the channel, and the specific campaign. Without capturing them at form submission time, you lose the connection between "money spent" and "lead acquired."

The five standard UTM parameters are:

• utm_source - where the traffic came from (google, facebook, newsletter)
• utm_medium - the marketing channel (cpc, email, social, referral)
• utm_campaign - the specific campaign name (spring_sale, product_launch)
• utm_term - the paid search keyword (optional, mostly used with Google Ads)
• utm_content - differentiates ad variations or links within the same campaign (optional)

When these five fields appear alongside every form submission in your Google Sheet, you can answer questions like: "Which campaign generated the most leads this month?", "What is the cost-per-lead for our Google Ads vs Facebook Ads?", and "Which email subject line drove the most demo requests?"

SheetLinkWP intercepts UTM parameters at the WordPress level, not the form level. Here is what happens:

1. Visitor arrives on any page with UTM parameters in the URL.
2. SheetLinkWP stores the UTM values in a first-party cookie (httpOnly, SameSite=Lax).
3. Visitor browses your site - maybe reads a blog post, visits the pricing page, then navigates to the contact page.
4. Visitor submits a form on any page. SheetLinkWP reads the UTM cookie and appends all parameters to the webhook payload.
5. Google Sheet receives the submission with utm_source, utm_medium, utm_campaign, utm_term, utm_content, plus any click IDs - all in dedicated columns.

This works with all 7 supported form plugins without any per-form configuration.

The traditional way to capture UTM data is to add hidden fields to every form and use JavaScript to populate them from the URL. This approach has several problems:

• You must modify every form - add 5+ hidden fields to every form on every page. If you have 20 forms across your site, that is 100+ hidden fields to maintain.
• JavaScript dependency - if the JS fails to execute (ad blockers, script errors, race conditions), the hidden fields stay empty and you lose attribution data.
• No cross-page persistence - if the visitor lands on page A (with UTM params) but submits a form on page B, the URL parameters are gone.
• Form plugin compatibility - hidden field implementations differ between form plugins.

SheetLinkWP eliminates all of this. UTM capture is a single toggle in the plugin settings. No form modifications. No JavaScript. No per-plugin workarounds.

The cookie that stores UTM data is a first-party cookie set on your own domain. Key details:

• Duration: 30 days by default, configurable from 1 to 365 days in SheetLinkWP settings.
• First-touch vs last-touch: By default, SheetLinkWP uses last-touch attribution. You can switch to first-touch mode to preserve the original acquisition source.
• Cookie scope: The cookie is set on the root domain, so it works across subdomains.
• Privacy: The cookie contains only UTM parameter strings and click IDs. No personal data, no tracking pixels, no third-party scripts.

Beyond UTM parameters, ad platforms append their own click identifiers to URLs:

• GCLID (Google Click ID) - added by Google Ads when auto-tagging is enabled. Links your form submissions back to the exact Google Ads click, enabling offline conversion tracking.
• fbclid (Facebook Click ID) - added by Meta when users click ads on Facebook or Instagram. Useful for CAPI (Conversions API) integration.
• msclkid (Microsoft Click ID) - added by Microsoft Advertising (Bing Ads).

SheetLinkWP captures all three automatically when click ID tracking is enabled. You can then feed these IDs back to the ad platforms for offline conversion tracking.

Once UTM data is flowing into your Google Sheet alongside form submissions, you can build powerful attribution reports using native Sheets features:

Leads by source - Use COUNTIF formulas on the utm_source column to count leads from each source. Create a pie chart for a visual breakdown.

Campaign performance table - Set up a pivot table with utm_campaign as rows and lead count as values. Sort descending to find your top performers.

Weekly lead volume by channel - Use COUNTIFS with date and utm_medium filters. Plot as a stacked bar chart to see channel trends over time.