The cb_session_id Cookie (and How to Categorize It)

If your cookie scanner or consent banner (like CookieYes, Cookiebot, or Complianz) flagged a cookie named cb_session_id, that cookie is from Conversion Bridge. Here's what it does and how to categorize it.

What the cb_session_id Cookie Does

Conversion Bridge sets cb_session_id to power conversion journeys. A journey is the path a visitor takes across your site before they convert. The cookie lets Conversion Bridge connect the pages someone viewed to the conversion they complete later, so you can see which landing pages and campaigns actually drive results.

A few details for your cookie declaration:

• Type: First-party, set by your own site rather than a third party.
• Value: A random ID. It holds no personal information and isn't tied to a real identity.
• Expiry: About one year (365 days).
• Set by: JavaScript, with SameSite=Lax.

How to Categorize It

Categorize cb_session_id as an Analytics cookie. Some banners label this same category Statistics or Performance.

It isn't a strictly necessary cookie, and it isn't an advertising cookie. Its only job is measurement: understanding how visitors move through your site on the way to a conversion. Analytics is the right home for it.

It Already Respects Your Consent Banner

If you've connected a cookie consent banner to Conversion Bridge, you don't have to worry about this cookie setting before a visitor agrees. Conversion Bridge waits for analytics consent before it sets cb_session_id. If a visitor declines analytics cookiesA small piece of data stored in a user’s browser that helps websites remember user activity, preferences, or sessions across visits., the cookie is never set.

Prefer Not to Set a Cookie at All?

Conversion Bridge can track conversion journeys without any cookie. In Settings → Conversion Bridge → Options, under Conversion Tracking, change the Tracking Method from Cookies to Fingerprinting. With fingerprinting, no cb_session_id cookie is set, so there's nothing for your banner to list.

There's a tradeoff. Fingerprinting only recognizes a visitor for a single day, so journeys that span several days are less complete. Cookies give more accurate, longer-lasting attributionThe process of determining which channels, campaigns, or actions contributed to a conversion, helping you understand what influenced a visitor’s decision to take action.. Most sites that use a consent banner keep the Cookies method and simply categorize cb_session_id as Analytics. For a full comparison, see Tracking Methods: Cookies vs Fingerprinting.