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A pre-signed URL gives you access to the object identified in the URL, provided that the creator of the pre-signed URL has permissions to access that object. That is, if you receive a pre-signed URL to upload an object, you can upload the object only if the creator of the pre-signed URL has the necessary permissions to upload that object.
All objects and buckets by default are private. The pre-signed URLs are useful if you want your user/customer to be able upload a specific object to your bucket, but you don't require them to have AWS security credentials or permissions. When you create a pre-signed URL, you must provide your security credentials, specify a bucket name an object key, an HTTP method (PUT of uploading objects) and an expiration date and time. The pre-signed URLs are valid only for the specified duration.
You can generate a pre-signed URL programmatically using the AWS SDK for Java or the AWS SDK for .NET. If you are using Visual Studio, you can also use the AWS Explorer to generate a pre-signed object URL without writing any code. Anyone who receives a valid pre-signed URL can then programmatically upload an object.
For more information, go to Using Amazon S3 from AWS Explorer.
For instructions about how to install the AWS Explorer, see Using the AWS SDKs and Explorers.
Anyone with valid security credentials can create a pre-signed URL. However, in order to successfully upload an object, the pre-signed URL must be created by someone who has permission to perform the operation that the pre-signed URL is based upon.