S3 Browser allows you to work with Amazon S3 Buckets shared by other users (these are External Buckets) even if you are not signed up for Amazon S3. All you need is an Amazon Web Services (AWS) Account. Of course, you can work with External Buckets if you have an Amazon S3 Account as well.

To connect to an External Bucket please follow these simple instructions:

1. Click Buckets->Add External Bucket.
   Click Buckets->Add External Bucket on the menu. You can also use Ctrl+E keyboard shortcut.
2. 
   Enter the name of the bucket you want to connect and press Enter. The bucket should exist and you should have READ and/or WRITE permissions.
   Enter the name of the bucket you want to connect
3. 
   The external bucket is added. Now you can upload, download, copy, move files to and from this bucket.
   The external bucket is added. Now you can work with it according to the permissions you have.