Table of Contents
gclid identifies a Google Ads click. UTM parameters describe its source, medium and campaign in readable text. They can appear in the same URL, but you store and use them differently when tracking leads or importing offline conversions.
The Anatomy of a GCLID
A GCLID is an identifier associated with an ad click. Its contents are not a documented campaign export format. Store the original value without lowercasing, truncating or inventing a decoder.
Illustrative URL: https://example.com/demo?gclid=EXAMPLE_CLICK_ID&utm_source=google&utm_medium=cpc&utm_campaign=demo_launch. The placeholder is not a real click ID. Your CRM should keep the identifier and campaign labels in separate fields.
Browser Privacy Restrictions: WebKit ITP & Link Decoration
Browser privacy controls can reduce storage duration. WebKit documents conditional limits on script-created cookies after detected tracking link decoration and removal of script-writable storage after seven days without user interaction. The applicable behavior depends on the browser and navigation context.
- Test whether your campaign record survives the actual journey in Safari and other supported browsers, including consent decisions, repeat visits and form submission.
- Once a lead submits a form, store the permitted campaign context in your CRM with its timestamp and retention rules. A cookie expiration setting alone does not guarantee browser persistence.
UTMs are not an exemption from tracking prevention. For the current behavior, consult WebKit’s tracking-prevention documentation. Server-side collection should respect consent and privacy choices too.
Data Durability & Offline Conversion Imports
For a long sales cycle, capture permitted click identifiers and campaign labels when the prospect submits a form, and keep them with the lead record. Use the supported offline conversion import workflow; enhanced conversions for leads is a related setup with its own requirements. A stored identifier does not guarantee every later conversion is eligible for import.
For the broader setup, read Google Ads UTM Tracking Guide: ValueTrack, Tracking Templates & GA4 Attribution. Browse the Google Ads Tracking guides to choose another troubleshooting task.
References
- Google Click Identifier (GCLID): Definition (Google Ads Help)
- Set up offline conversions using Google Click ID (GCLID) (Google Ads Help)
- WebKit Intelligent Tracking Prevention 2.1 (WebKit)
