You can convert one or more selected images into a multipage TIFF file within
ACDSee.

To create a multi-page TIFF file:

1. Select the image(s) you want to include.
2. Click Tools | Convert File Format.
3. Select Tiff.
4. Click Next.
5. Click Next.
6. In the Output area, select Merged.
7. Click Start Convert.
8. Click Finish.