With S3 Browser Freeware you can easily copy and move files between accounts. Below you will find detailed instructions exlaining how to copy/move files from one Amazon S3 account to another. In order to copy files from one Amazon S3 account to another, you need READ access for the source bucket and WRITE access for the destination bucket. Check out the links below for more information about granting acces to your bucket: Step 1 - if all permissions are OK, navigate to the source bucket and select files and/or folders you want to copy or move. Step 2 - click Files->Copy if you need to copy these files or click Files->Cut if you need to move these files. 
Select files and folders you want to copy or move between accounts Step 3 - Open the destination (external) bucket and click Files->Paste to copy or move selected files to the destination Amazon S3 bucket. 
Open the destination (external) bucket and click Files->Paste. You can also use Ctrl+V keyboard shortcut. S3 Browser will start the copy/move operation and will refresh the files list when the operation is completed. 
You can track progress on the Tasks tab. 
All files were successfully copied between accounts If you need to copy large amount of files, this operation may take a while. You can significantly speed up file copying with S3 Browser Pro. It allows you to increase the number of concurrent working threads and thereby process your files much more faster.
See also How to Copy/Move Files and Folders from One Amazon S3 Bucket to Another How to clone an S3 Bucket. Copy all files from one Amazon S3 Bucket to another.
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