Hope this helps. If you are using Windows 11/10 OS, then converting a multipage TIFF to a PDF file is easy. You can use any of the multipage TIFF converter tools for this purpose. To make it easy ...

Converseen is a free batch image converter for Windows and other platforms ... Apart from PDF, you can convert HEIC/ HEIF to JPG, PNG, GIF, BMP, TIFF, and many other formats.

How to convert a PDF to JPG, PNG, or TIFF One of the most widely known free ... and you can only perform 3 tasks per hour.