# Page Click ID

> The 30-character click ID for the current page session, generated by the Tracking Tag on page load — the root a Click ID extends to 34.

The Page Click ID (`atclid`) is a 30-character click ID for the **current page session**. The Tracking Tag generates it when a page loads; it is not tied to a specific element.

## How the Page Click ID relates to the Click ID

The atclid is the root that a Click ID extends. A full Click ID is 34 characters — the atclid plus characters that identify a specific element (a link, form, or cart). So one page load has a single atclid, but each trackable element on it gets its own Click ID.

## Notes on the Page Click ID

`PageView` is the only standard event that does not generate a Click ID by default. In Shopify, the atclid is carried into the order via `note_attributes.__atclid` and the line-item `properties._atclid`, so the server-side order matches back to the browser session.