LinkCleanhttps://example.com/landing?li_fat_id=2a1b3c4d-5e6f-7890-abcd-ef1234567890
After LinkCleanhttps://example.com/landing
li_fat_id
Ad-click identifiers · LinkedIn Ads · introduced ~2017
What is li_fat_id?
Why li_fat_id is different
Most ad-network click IDs (fbclid, gclid, msclkid, ttclid) are tied to a *session* on the ad network's side — joinable to your account on their books, but not literally your email address.
li_fat_id is unusual: it's tied to LinkedIn's first-party identity record for the member, which is keyed to their email address. LinkedIn pioneered this so it could keep attribution working across browsers that block third-party cookies — but the result is an ad-click ID more tightly bound to a named-individual identity than the rest.
Forwarding li_fat_id leaks an identifier joined directly to the original member's LinkedIn email. The blast radius is closer to Mailchimp's mc_eid than to fbclid.
How LinkClean removes it
li_fat_id is in LinkedIn's reference catalog and ships on by default for LinkedIn ad-link cleaning. LinkClean also strips rcm (LinkedIn's share/recommendation token) host-scoped to linkedin.com.
Frequently asked
What does “FAT” stand for in li_fat_id?
First-party Ad Tracking. LinkedIn's name for their cookie-independent click-attribution system, introduced to keep conversion measurement working under Safari's Intelligent Tracking Prevention and Firefox's tracking protections.
Is li_fat_id more personal than fbclid?
Yes. It's bound to the LinkedIn member's email-address identity on LinkedIn's side, not just a session cookie. Forwarding it leaks an identifier closer to an email address than to a fbclid-style click session.
Does LinkedIn also use rcm?
Yes — rcm is LinkedIn's share/recommendation token (a different identifier from li_fat_id). LinkClean strips it too, host-scoped to linkedin.com.
Clean tracking on iPhone, in one tap.
LinkClean strips ~80 vendor-specific tracking parameters from any link, from any app's share sheet — and preserves functional ones like hl, t (YouTube timestamp), and q (search). No account, on-device.
