No, as of 2026, you generally do not need to print your TGV ticket if you have a smartphone. SNCF (the French national railway) and most major European rail operators have fully transitioned to digital "e-tickets." When you book via the SNCF Connect app or sites like Trainline, you receive a confirmation with a unique QR code. You can simply display this code on your phone screen for the conductor to scan or to open the automatic ticket gates at major stations like Paris Gare du Nord. If you prefer a physical copy or if your phone battery is unreliable, you can still print the PDF at home or use your "file reference" number to print a ticket at one of the yellow self-service kiosks (Borne Libre Service) found in French stations. Note that unlike older paper tickets, digital e-tickets do not need to be "validated" (stamped) in the yellow compostage machines before boarding; the electronic scan by the conductor serves as your official validation.