Convert x3f to pdf Online: x3f2pdf

You can use Tom's Editor to easily convert images from
Sigma Camera RAW Picture File .X3F to Portable Document Format .PDF.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

X3F

Sigma Camera RAW Picture File is an image format with extension X3F.

PDF

Adobe PDF format is the most popular document format. Overcomplicated. Offers compression.