# Object Tags

US3 supports using tags to classify objects (Objects) in storage spaces (Buckets). Users can set lifecycle rules for objects with the same tag. For lifecycle-related information, please visit Lifecycle. Currently, object tags are supported in Vietnam and Brazil. For other regions, please contact technical support if needed.


## Instructions for Use

Object tags use a set of key-value pairs (Key-Value) to mark objects. Users can add tags when uploading objects or add tags to existing objects.

* A single object can be set with a maximum of 10 tags. Keys cannot be duplicated, and neither keys nor values can be empty.

* Each key can be up to 128 characters in length, and each value can be up to 256 characters in length.

* Keys and values support uppercase and lowercase letters, numbers, spaces, and special characters: + - = . _ : / @.

Note: When setting tags via HTTP Header and the tags contain any special characters, the keys and values of the tags need to be URL-encoded.

## Setting Object Tags

1. Log in to US3 object storage console.

2. Click on **Single Region Space Management**, then click on the target Bucket.

3. In the top navigation bar, select **File Management** to set tags for objects:

    1) When uploading an object:

       Click on **Upload File**, for object tag rules please refer to [Instructions for Use](#Instructions for Use) for specifying tag's key and value.
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    2) For uploaded objects:

       Under the operation bar on the right of the target object, select **Manage Tags** in the ···More Operations List, supporting viewing, editing or deleting added tags. For object tag rules, please refer to [Instructions for Use](#Instructions for Use).
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4. Click **OK**.

## Billing Explanation

US3 object storage calculates object storage tag fees daily based on the number of object tags in the user's storage space (Bucket).

> For pricing details of US3 billing items, please refer to Product Pricing.

| Billing Item    | Price ($/ten thousand tags) |
|-----------------|-----------------------------|
| Object Tag Fee  | $0.000297                   |