Giga Watasu, operated by Good Hill Systems Inc., is a large-file transfer service for individuals, freelancers, families, and businesses. It lets users send files of up to 333 GB without registering, with recipients able to download files without an account. Transfers can be shared through a link, QR code, or email, and users can set expiration dates, passwords, download limits, or one-time downloads. Files are stored with AES-256 encryption, and the service includes virus scanning, SSL-protected communications, and automatic deletion after the selected retention period.

A free account adds storage for up to 111 days, transfer history, file management, recipient folders, custom URLs, download notifications, and options such as IP restrictions. For organizations, Giga Watasu for Biz offers team management, consolidated billing, approval workflows, email notifications and cancellations, and one-year audit logs with CSV export. The business plan costs ¥550 per user per month, has no initial fee or minimum contract period, and includes a 30-day free trial. The operator states that it has obtained PrivacyMark certification.