Merge Digital Artworks Into JPG

I have a set of more than five digital artworks that I need stitched together into a single high-resolution JPG. The images must appear one after another in a straight line—either all stacked vertically or all placed side-by-side horizontally; whichever orientation keeps the full quality without distortion works for me.

You’ll receive the source files the moment we start. I just need you to:
• arrange every image in the agreed single column or single row, keeping original dimensions intact where possible
• ensure colours stay true and edges are crisp (no compression artefacts)
• export and deliver one final JPG ready for immediate use

Any mainstream graphics tool—Photoshop, Illustrator, Affinity, GIMP—is fine so long as the end result meets those points. It’s a quick task, so a fast turnaround will be appreciated.