As a developer, I used to script my JPG to PDF conversions using CLI tools like ImageMagick or Ghostscript. While powerful, they weren't fast or user-friendly for quick daily tasks.
Now I use this:
👉 https://www.mylovelypdf.com/convert-jpg-to-pdf

Why I love it:
No installation required
No file size limits
Perfect for quick mobile exports
Easy for non-techies in my team

You just upload JPG files, and get a downloadable PDF instantly. I’ve even bookmarked it.
Let me know if you’ve found faster ways — but this one's hard to beat.