Finder: Create PDF (several images at once)
- Select the images in Finder, in the order you want.
- Right-click and choose Quick Actions → Create PDF.
A PDF with one page per image appears in the same folder.
Preview: one image
Open the image in Preview and choose File → Export as PDF.
Preview: several, in your order
- Select the images and open them together in Preview.
- Show the sidebar (View → Thumbnails) and drag the pages into order.
- Choose File → Print, then PDF → Save as PDF.
From the notch
NotchMind, which I make, converts an image to PDF on the Converter page in the notch: drop it, choose PDF, convert. See convert files in the notch.
NotchMind