Checking in online for a hotel is highly recommended in 2026 as it streamlines the arrival process and offers several "digital-first" perks. Most major chains like Marriott, Hilton, and Hyatt allow you to check in via their mobile app up to 24 hours in advance. This often grants you access to a Digital Key, allowing you to bypass the front desk entirely and unlock your room with your smartphone. Online check-in is also the most opportune time to secure room upgrades or request specific preferences, such as a high floor or extra pillows, before the physical room assignments are finalized for the day. For business travelers, it ensures a frictionless transition from the airport to the room, while for the hotel, it helps balance staff workload. By providing your arrival time digitally, you increase the likelihood that your room will be ready exactly when you step through the lobby doors.