Use Adobe Photoshop
Double-click the PSD file
Open Photoshop first, then choose File > Open
Drag and drop the PSD file into Photoshop
Use Adobe Photoshop Express or Photoshop on mobile
Use GIMP
Use Photopea in a web browser
Use Affinity Photo
Use CorelDRAW
Use Preview on macOS for viewing only
Use Windows Photos or File Explorer preview for basic viewing
Convert the PSD to another format if needed