Send user IDs

The User-ID feature lets you associate your own identifiers with individual users so you can connect their behavior across different sessions and on various devices and platforms.

This article describes how to send user IDs from your website once you've generated the user IDs. To learn more about the User-ID feature, see Measure activity across platforms. To learn how to set a user ID for an app, see Set a user ID instead.

Before you begin

This guide assumes that you've done the following:

It also assumes that you have the following:

  • Access to your website source code
  • The Editor role to the Google Analytics account

Send user IDs

To send a user ID to Analytics, add the user_id parameter to the config command in the measurement code on each page of your website. Using the following snippet, replace G-XXXXXXXX with your tag ID and USER_ID with the generated user ID.

gtag('config', 'TAG_ID', {
  'user_id': 'USER_ID'