If you've made a file public, you can return it to its private condition.

To make a public file private

• Open the Amazon S3 console at https://console.aws.amazon.com/s3/.
• In the Amazon S3 console, select the bucket that you created to contain your files. In our example, we will select the example123 bucket.
• Click the file you uploaded.
• Click Properties.
• Click Permissions.
• Uncheck the Open/Download checkbox for the Grantee Everyone.

• Click Save.