s3duct is an open-source command-line tool that enables chunked, resumable, and encrypted uploads to S3-compatible object storage services. It is designed for developers who need reliable, secure, and efficient backup or data transfer workflows. The tool supports AES-GCM and age encryption, making it suitable for sensitive data handling.
In the Infrastructure & Backend space, s3duct takes a focused approach. Securely and reliably uploading large files to S3-compatible object storage with support for encryption and resuming interrupted transfers. It is built as an open-source project for developers. s3duct is open source under the Elastic-2.0 license. The product ships for the command line.
Behind s3duct is SiteRelEnby, and the product first shipped in 2026. PulseGate's similarity index finds few close equivalents — s3duct occupies a relatively distinct niche. Key capabilities include chunked uploads, resumable transfers, and S3-compatible.
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