In Budapest, purchasing a ticket is only half the process. To prevent heavy fines, every single ticket must be validated immediately upon boarding or entering the transit station platform. Fare inspectors operate extensively and do not make exceptions for visitors.
Locate the orange or yellow validating machines on board vehicles (or at metro entrance gates). Insert your ticket into the slot. For manual punchers, pull the black handle firmly towards you to punch holes. For digital stampers, insert the ticket until you hear a beep and see the stamped date and time.
Launch the BudapestGO app and tap your active ticket. Scan the NFC validation sticker located on the outside of the vehicle near the doors (or at metro entrance pillars). If NFC fails, tap 'Scan QR Code' to scan the printed barcode. Once validated, an animated symbol will appear—you must show this to drivers or inspectors.