Browsers block or restrict third-party cookies, ad blockers strip tracking scripts, and privacy rules limit what can be stored. Attribution that depends on a third-party cookie following someone across the web is no longer reliable. Cookieless attribution works differently.
What replaces the third-party cookie
- First-party collection. A small script on your own domain records each landing visit. Because it is first-party, it isn't treated like a cross-site tracker.
- Server-side processing. The script sends only the landing URL and referrer. Parsing, matching and storage happen on the server, where you control what's kept.
- Deterministic keys. Ad platforms add a click ID to the landing URL, such as
gclidorfbclid. If that ID shows up on the order, the match is exact. See click IDs explained. - Hashed identity. When a visitor signs up or checks out, their email is hashed in the browser, and the same hash appears on the order. See hashed email matching.
- Probabilistic fallback. When neither key is present, a masked network and device within the lookback window can still suggest a match, with a lower confidence score.
Why server-side is more accurate
Client-side pixels lose data to blockers and to purchases on other platforms. A server-side approach brings orders in from the source (Shopify, Amazon exports, POS systems, app stores), so a sale is counted even when the buyer never returned to your site.
Privacy by construction
Cookieless doesn't have to mean "collect everything on the server." Good practice is to keep as little as possible:
- Drop the last block of every IP address before storing it.
- Store emails only as hashes, hashed again with a server-side secret.
- Encrypt platform tokens at rest, and store API keys only as hashes.
That's how Trakinit works. Read privacy and security.
A short checklist
- Put a first-party snippet on every landing page.
- Keep UTMs consistent (see our UTM guide).
- Call identify on signup and checkout forms.
- Bring in orders from every platform, not just your site.
- Show match confidence, so estimates are never mistaken for facts.
Frequently asked questions
Is server-side tracking GDPR compliant?
Server-side tracking can support compliance because you control exactly what's collected and stored, but compliance also depends on consent, notices and data-processing terms. Collect identifiers only with a lawful basis.
Does cookieless attribution work with ad blockers?
Much better than third-party pixels, because collection runs on your own domain and orders come straight from your stores. Some blockers still block first-party scripts, which is why server-side order data matters.
What's the difference between first-party and third-party cookies?
First-party cookies belong to the site you're visiting; third-party cookies belong to other domains embedded on it. Browsers restrict third-party cookies, which is why cross-site tracking breaks. Read how to choose attribution software.
Start a free trial and see cookieless attribution on your own data.