PDF Version Converter converts PDF files between various versions, from the initial Adobe PDF specification version 1.0 to the most recent version 2.0 released in 1993.

For instance, some journal publishers only accept the submission of PDF files of version 1.4 or later, while some obsolete Windows applications only read PDF files of version 1.2. But what if you have a PDF file of version 1.1? This is where PDF Version Converter comes in handy.
PDF Version Converter enables users to convert PDF files between different versions. The software utility lets users upgrade or downgrade PDF versions to get the compatibility they need. Users can convert PDF files to any of the following versions:
- PDF version 1.0 (Adobe Acrobat 1.x)
- PDF version 1.1 (Adobe Acrobat 2.x)
- PDF version 1.2 (Adobe Acrobat 3.x)
- PDF version 1.3 (Adobe Acrobat 4.x)
- PDF version 1.4 (Adobe Acrobat 5.x)
- PDF version 1.5 (Adobe Acrobat 6.x)
- PDF version 1.6 (Adobe Acrobat 7.x)
- PDF version 1.7 (Adobe Acrobat 8.x, 9.x, 10.x, 11.x, ISO 32000)
- PDF version 2.0 (Adobe Acrobat, ISO 32000-2)
It is worth noting that the actual file size of the generated PDF file after conversion might differ slightly from the original because different PDF specifications differ in how they structure and organize the objects in a PDF file.
Version 2.21: Add support for Adobe Acrobat XI and Windows 8 x64.