It is not required, however, we highly advise that travelers print out a copy of their E-Visa when traveling. The copy serves as a backup during various phases of your journey, such as at immigration checkpoints when boarding your flight or in emergencies.
While Vietnam immigration authorities have access to your visa information online, having a printed copy provides a quick processing of your visa on arrival, which will be beneficial in rare cases, when the electronic system is delayed or its server is down. Therefore, carrying a copy not only speeds up the process on arrival but also minimizes any potential delays at the Immigration checkpoint.