Z.com Cloud Object Storage is part of the Z.com Cloud platform, operated by GMO Internet Group. It provides storage with no capacity limit and no outbound data transfer fees.

The service uses an OpenStack-based API rather than S3. Teams already running virtual servers or networks on Z.com Cloud can manage storage from the same control panel. All data is automatically copied across multiple servers for redundancy.

A global English website is available at cloud.z.com alongside the Japanese portal.