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This is a good reference and starting point.

Low-entropy hints are automatically provided by the browser and ingested for deriving device and browser information. Newer versions of Web SDK (starting with 2.12.0) and AppMeasurement (starting with 2.23.0) can be configured to collect high-entropy hints via their respective Tags extensions or directly via a configuration option. See directions for Web SDK and AppMeasurement.

For both libraries, collection of high-entropy hints is disabled by default.

For data submitted via API, such as via or Bulk Data Insertion API, hints must be explicitly included in the payload. See the respective documentation for details.

Not at this time. You can choose to collect all high-entropy hints or none.

Note that fullVersionList is currently not collected because browser major version is captured as a low-entropy hint.

The table below describes the client hints as of October 2022.

table 0-row-4 1-row-4 2-row-4 3-row-4 4-row-4 5-row-4 6-row-4 7-row-4 8-row-4
Hint	Description	High or Low Entropy	Example
Sec-CH-UA	Browser and significant version	Low	"Google Chrome 84"
Sec-CH-UA-Mobile	Mobile device (true or false)	Low	true
Sec-CH-UA-Platform	Operating System/Platform	Low	"Android"
architecture	Architecture of the site	High	"arm"
bitness	Architecture bitness	High	"64"
fullVersionList	List of brands with their version	High	"Not A;Brand";v="99", "Chromium";v="98", "Google Chrome";v="98"
model	Device model	High	"Pixel 3"
platformVersion	Operating System/Platform version	High	"10"

• Low-entropy hints are collected through the request header.
• High-entropy hints are collected through JavaScript and passed through query string parameter values. The query string parameters use h. as a prefix in the image request. Note that fullVersionList is currently not collected because browser major version is captured as a low entropy hint.

High entropy hints are collected via JavaScript call and passed via query parameter

The device fields available for reporting will not change. The data captured for those fields may change depending on which field and how you have configured collection for client hints.

These fields are directly derived from the User-Agent but User-Agent may be used to help derive values for other device related fields, depending on the device details.

• Browser
• Browser Type
• Operating System
• Operating System Types
• Mobile Device and Mobile Device Type

See the . This may be subject to change.

Device information in reporting is derived from the User Agent. We have updated our processes to use both User Agent and client hints where available.

The Fallback ID (s_fid) is derived from the User Agent and IP Address. This ID is only used if a cookie cannot be set so is not widely used

This will change over time as Google ‘freezes’ more parts of the User Agent. The first field to be directly impacted is “Operating System” which includes the operating system version According to Google’s published timeline for “freezing” User-Agent hints, operating system version will be frozen starting late October 2022 with Chromium version 107. At that point the operating system version in the User Agent will be inaccurate in some cases.

Refer to the to see the timing for freezing of other portions of the User-Agent.

�۶���Ƶ uses a third party, Device Atlas, who will use both client hints and the User-Agent to derive device information.

Client hints apply only to Chromium browsers such as Google Chrome and Microsoft Edge. There is no change to data from other browsers or mobile apps.

No. Client hints can only be collected through a secure HTTP connection, such as HTTPS.

See documentation for including these via .

�۶���Ƶ plans to include client hints in data via �۶���Ƶ Source Connector in the first half of 2023.

See the in �۶���Ƶ Experience Platform.

Yes. Client hints will be included in the data forwarded to �۶���Ƶ Audience Manager. Note that �۶���Ƶ Audience Manager requires high-entropy hints to be collected to preserve full functionality. If you are using server-side forwarding to �۶���Ƶ Audience Manager then you may want to enable collection of high-entropy hints.