ConcatPDF 1.3.2 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions among the program users are 1.2 and 1.1.
You can run this free PC program on Windows XP/Vista/7/8/10/11 32-bit. We recommend checking the downloaded files with any free antivirus. This free tool was originally created by Ujihara. The default filenames for the program's installer are ConcatPDF.exe, ConcatPDFW.exe, _2cd672ae.exe or _644366bb.exe etc. ConcatPDF is categorized as Office Tools.
From the developer:
ConcatPDF is the tool to concatenate PDF files. It can concatenate, extract, encrypt, decrypt, configure PDF files, convert image files to PDF. GUI version and CUI version are both available. iText.NET is iText porting on .NET Framework by J#. This library allows you to generate PDF, (X)HTML, XML, RTF files on Microsoft.NET Framework including ASP.NET.
You may want to check out more software, such as NJStar Japanese WP, Analyse-it for Microsoft Excel or PDF to IMAGE, which might be related to ConcatPDF.