I want to increase or decrease the size of my Amazon Elastic Block Store (Amazon EBS) volume.
Resolution
You can only increase the size of your Amazon EBS volume. You can't decrease an EBS volume's size. To use a smaller volume, create a smaller volume. Then, use an application-level tool to migrate your data to the smaller volume.
For more information, see the following EBS documentation:
For Linux:
For Windows:
If you're using the AWS Software Development Kits (AWS SDKs) to modify volumes, then refer to the documentation that's specific to your AWS SDK.