> For the complete documentation index, see [llms.txt](https://karansingh.gitbook.io/aws-saa-c02/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://karansingh.gitbook.io/aws-saa-c02/simple-storage-service-s3/pre-signed-urls.md).

# Pre-signed URLs

* **All objects by default are private**.<br>

* Only the object owner has permission to access these objects.
  * However, the **object owner can optionally share objects with others by creating a presigned URL, using their own security credentials**, to grant time-limited permission to download the objects.<br>

* When you create a presigned URL for your object, you must **provide your security credentials, specify a bucket name, an object key, specify the HTTP method and expiration date and time**.<br>

* The **presigned URLs are valid only for the specified duration**.

* **Anyone who receives the presigned URL can then access the object**.