S3 API Reference

S4 implements the AWS S3 API, providing compatibility with standard S3 tools and SDKs including AWS CLI, boto3, rclone, and restic.

All S3 API requests support AWS Signature V4 authentication.

S4 supports AWS Signature Version 4 for authenticating S3 API requests. This is the same authentication mechanism used by AWS S3, ensuring compatibility with all standard S3 tools and SDKs.

Bucket Operations

S4 supports standard S3 bucket operations.

Multipart Upload

> Last updated: 2026-04-25

Object Operations

S4 supports standard S3 object operations.

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