23 Apr. 2025
  released NK-AC TOOL Ver.2.6.8.0
  NK-AC TOOL Ver.2.5.7.0 will continue to be available.

You can download the newest version of NK-AC TOOL (ver. 2.6.8.0) from [Download] button after login.

Procedure after download:
1.Unzip the NKACTool.zip by right-click to select Extract All, and then follow the instructions.
2.Execute "setup.exe" file in the unzipped file and install.

In order to install NK-AC TOOL in windows PC, you need Windows administrator's privilege.
For installation of NK-AC TOOL, please contact your system administrator, if need.


23 Oct. 2024
  released Uploading template Ver.2.3.1.0
    Uploading template Ver. 2.2.0.0 cannot be used after 1 Dec. 2024.
    Please use Uploading template Ver. 2.3.1.0 after 1 Dec. 2024.


22 May. 2024
  released User Manual Ver.3.5


16 Feb. 2023
  The domain of the e-mail address sent from ClassNK Archive Center has changed.
  Please set so that you can receive e-mail from "classnk.or.jp" domain.