S3Express: Amazon S3 Command Line Utility

Amazon S3 command line utility for Windows. Copy, query, backup multiple files to S3 using the Windows command line.

S3Express FAQ and Knowledge Base

Main Page > Browse Categories > Release History > Version 1.5.3 (Oct 2014)

Version 1.5.3 (Oct 2014)

New Features:

  • New PUT command option -optimize: enable thread optimization for transferring large amounts of relatively small files over fast connections. Recommended to use with at least 4 threads (-t:4).

  • Increased the maximum threads that can be used in the PUT command to 32.


  • PUT command: now only scans files in the remote Amazon S3 bucket if the upload condition does contain a S3 object variable.


  • PUT command: fixed a file naming issue that could occur when uploading files from the root folder of a drive (e.g. E:\)

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