> For the complete documentation index, see [llms.txt](https://docs.ionos.com/cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ionos.com/cloud/~/revisions/bM7yG7XCmGE9IxWqMpBu/managed-services/s3-object-storage/concepts/s3-api-compatibility.md).

# S3 API Compatibility

The S3 (Simple Storage Services) API has been the global standard for object storage for many years. It provides interoperability and compatibility of various object storage systems that adhere to this standard. IONOS S3 Object Storage has one of the highest levels of S3 API support.

For more information, see [<mark style="color:blue;">IONOS S3 Object Storage API</mark>](https://api.ionos.com/docs/s3/v2/) documentation.

| **Feature**                          | **Supported** | **Notes**                                                                                                                                      |
| ------------------------------------ | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| Bucket CRUD                          | Yes           |                                                                                                                                                |
| Object CRUD                          | Yes           |                                                                                                                                                |
| Object Copy                          | Yes           | Cross-regional copying is not supported                                                                                                        |
| Multipart Uploads                    | Yes           |                                                                                                                                                |
| Pre-Signed URLs                      | Yes           | Signature types v2 and v4 are supported                                                                                                        |
| Bucket ACLs                          | Yes           |                                                                                                                                                |
| Object ACLs                          | Yes           |                                                                                                                                                |
| Block Public Access                  | Yes           | Only via the API                                                                                                                               |
| Bucket Policies                      | Yes           |                                                                                                                                                |
| Object Policies                      | Yes           |                                                                                                                                                |
| CORS Configuration                   | Yes           |                                                                                                                                                |
| Bucket Versioning                    | Yes           |                                                                                                                                                |
| Bucket Replication                   | Yes           | Intraregional and cross-regional replication are supported                                                                                     |
| Bucket Tagging                       | Yes           | Only via the API                                                                                                                               |
| Object Tagging                       | Yes           | Only via the API                                                                                                                               |
| Bucket Lifecycle                     | Yes           |                                                                                                                                                |
| Bucket Access Logging                | Yes           |                                                                                                                                                |
| Bucket Encryption Configuration      | Yes           | Server-side encryption is used by default in the web interface. The encryption with customer-managed encryption keys is available via the API. |
| Object Encryption                    | Yes           | Only via the API                                                                                                                               |
| Bucket Websites                      | Yes           |                                                                                                                                                |
| Bucket Inventory                     | Yes           | Only via the API                                                                                                                               |
| Object Lock                          | Yes           |                                                                                                                                                |
| Legal Hold                           | Yes           |                                                                                                                                                |
| Identity and Access Management (IAM) | No            |                                                                                                                                                |
| Security Token Service (STS)         | No            |                                                                                                                                                |
| Multi-factor Authentication          | No            |                                                                                                                                                |
| Bucket Notifications                 | No            |                                                                                                                                                |
| Request Payment                      | No            |                                                                                                                                                |
| Bucket Metrics                       | No            |                                                                                                                                                |
| Bucket Analytics                     | No            |                                                                                                                                                |
| Bucket Accelerate                    | No            |                                                                                                                                                |
| S3 Select                            | No            |                                                                                                                                                |


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