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Custom Dimension

A custom dimension registers a collected custom value for use as a reporting category in GA4. Scopes include event, user, and item.

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Match event parameters, user properties, and item values to the appropriate scope. Check for an existing built-in dimension before registering a new one.

Limits vary by scope and product edition. Archiving an unused definition affects reports that depend on it, and quota updates can take time. Archiving does not permanently consume its quota, and Firebase is not a higher Analytics subscription tier.

References

Frequently asked questions

Does registration fill all historical data?

No. Do not assume retrospective population; verify collection and processing.