Bulk Change ACL for Amazon S3

Using bucket policies, it is easy to set ACL settings for all new objects that are uploaded to Amazon S3.

However, I wanted to remove 'public' read rights for a whole bunch of objects at the same time and such policies do not apply to objects that are already stored on S3.

I found an easy way to change the ACL settings for many objects at the same time. To bulk change, ACL, do the following:

• Download the free tool CloudBerry Explorer for Amazon S3
• Install it
• In the AWS management console, go to Security Credentials
• Create a new user 's3-super'. Save the access and secret key.
• Assign the role  'AmazonS3FullAccess' to the user

• Start CloudBerry Explorer and connect to your S3 with the access and secret key of the s3-super user
• Now in this tool navigate to the bucket with the objects you would like to change
• Select one or more objects for which you want to change the ACL settings in the left-hand column.
• Click on the button ACL Settings

• In the dialog that pops up, change the settings to what you like and click OK.

The ACL settings for your objects should now be changed.