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Get help with integration and live campaigns

Welcome to our Support Center. Get help with integration and live campaigns

Cross Device Overview

Criteo Cross Device enables Criteo to accurately match users across multiple devices. To benefit from Criteo’s Cross Device technology, you will need to add the Cross Device parameter to your existing Criteo OneTag.

Example: Let's assume your customer is browsing products on your website from his mobile device. Using Criteo Cross Device, it will be possible to later show this customer relevant banners on his desktop device.

The user’s email address will be passed within the Cross Device parameter. To facilitate the protection of Personally Identifiable Information (PII), all email addresses will be hashed (using an MD5 algorithm) before being stored on Criteo's servers. Criteo will then use the hash value to match users across each of their devices.


The protection of a user’s privacy is a major concern for Criteo’s clients. Criteo does not, nor ever will, store any personal data. To ensure we protect your client’s privacy, Criteo will only store the encrypted email addresses of your customers on its servers. The encryption process cannot be reversed, maintaining anonymity at all times.

Criteo does not collect, nor process any directly Personally Identifiable Information (PII). Instead Criteo uses “pseudonymous” information to match users with Cross Device.

To guarantee maximum protection, Criteo uses the MD5 hashing method to encrypt the user’s email addresses. MD5 email hashing creates a unique, persistent, identifier that allows Criteo to identify users across the different devices and across different client websites (see above), none of which can be used to identify your customers. Criteo will never store an unhashed email address.
Criteo offers users full transparency through our privacy policy and opt out solutions. In addition to this, we ask our partners to be transparent about our services and methods in their own privacy policy. This means that users can access information about our services at all stages of their navigation and can opt-out of our services at any time.

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