Constraints and Limitations

Maximum number of key-value pairs you can add for each resource

10

Tags of each resource

For each resource, each tag key must be unique, and each tag key can have only one tag value.

The maximum predefined tags that each account can create.

500

Predefined tags

Predefined tags cannot be identical. Either their keys or values must be different. If you create a predefined tag that is identical to an existing predefined tag, the existing predefined tag will be overwritten.

Tag keys

A tag key can contain a maximum of 36 characters, including digits, letters, underscores (_), and hyphens (-).

Tag values

A tag value can contain a maximum of 43 characters, including digits, letters, underscores (_), periods (.), and hyphens (-).