ClickTrail is an open-source attribution plugin for WordPress that operates under the GPL-2.0 license. It effectively preserves first-touch and last-touch campaign contexts throughout user interactions, including page visits, cached pages, dynamic forms, WooCommerce transactions, and authorized cross-domain activities. The plugin gathers important data such as UTMs, referrers, and significant ad click identifiers and integrates this information with various form submissions from Contact Form 7, Fluent Forms, Gravity Forms, WPForms, Elementor Forms (Pro), and Ninja Forms. Additionally, ClickTrail facilitates attribution for WooCommerce orders and purchase events, captures browser dataLayer events, and includes features for consent management, diagnostics, retry mechanisms, queue visibility, and an optional delivery pipeline. Notably, ClickTrail refrains from injecting advertising pixels, allowing site administrators to maintain control over their GTM tags and configurations. This ensures that site owners can tailor their tracking setup according to their specific needs while maintaining user privacy.