How QR Codes Cross the Language Barrier - The Technology of Automatic Multi-Language Switching
How a Single QR Code Supports Multiple Languages
Printing explanations in 10 languages on a sign at a tourist site is not realistic because of the limits of physical space. However, by placing just one QR code, you can automatically show a page in the appropriate language according to the language settings of the smartphone of the person who scans it.
Technically, the web server at the QR code's destination reads the Accept-Language header of the HTTP request and returns content in the corresponding language. Based on the smartphone's language settings, the browser automatically sends a header such as Accept-Language: ja,en;q=0.9,zh;q=0.8. The server parses this header and either redirects to the page in the language with the highest priority or returns content in that language directly.
The great thing about this mechanism is that the user does not need to do anything at all to choose a language. Just by scanning the QR code, Japanese people automatically see a page in Japanese, Chinese people a page in Chinese, and French people a page in French. There is no need to hunt for a language selection drop-down menu, so even users with low digital literacy can reach the information intuitively.
Use in Tourism - Information Infrastructure for an Era of 30 Million Foreign Visitors
According to statistics from the Japan National Tourism Organization (JNTO), the number of foreign visitors to Japan hit a record high in 2024, exceeding 30 million a year. Providing multilingual information to this many travelers of so many nationalities is an urgent task for Japan, which aims to be a tourism-oriented nation.
At spots where tourists concentrate, such as temples and shrines in Kyoto, transportation in Tokyo, and restaurants in Osaka, the introduction of multilingual guidance through QR codes is advancing rapidly. In particular, explanations of cultural properties contain many technical terms and require accurate translation, so it is easier to guarantee quality by guiding visitors through a QR code to translation pages supervised by experts than by writing multiple languages side by side on a signboard.
At large temples, shrines, and tourist facilities, there are examples of QR codes placed at various points on the grounds or in the buildings to provide explanations in multiple languages. A single QR code achieves a coverage of languages that is impossible with physical signs.
Healthcare - Providing Information to Patients Who Do Not Share the Language
The language barrier in medical settings is literally a matter of life and death. Situations such as a foreign patient being unable to describe symptoms accurately, not understanding a doctor's explanation, or taking medicine the wrong way lead directly to medical accidents.
According to the accrediting body, the Japan Medical Education Foundation, the "Japan Medical Service Accreditation for International Patients" (JMIP), established as a project supported by the Ministry of Health, Labour and Welfare, is a system that aims to develop structures for accepting foreign patients, such as medical guidance in multiple languages. QR codes are used at hospital reception desks, consultation rooms, and pharmacies as a means of providing this multilingual support at low cost.
A system in which a QR code is printed on a medical questionnaire and scanning it shows the questions in the patient's native language makes it possible to gather basic information even when no interpreter is present. A system in which a QR code is attached to a medicine bag and scanning it shows how to take the medicine, its side effects, and its contraindications in the patient's language leads directly to preventing medication errors.
Disaster Preparedness - Multilingual Communication During Disasters
The people most likely to become information-disadvantaged during a disaster are foreign residents and travelers who do not understand Japanese. In emergencies such as earthquakes, tsunamis, and typhoons, quickly communicating evacuation orders and the locations of shelters in multiple languages is a matter of human life.
Under the Ministry of Internal Affairs and Communications' "Disaster Information Coordinator for Supporting Foreign Nationals" system, the development of structures for sending out information in multiple languages is being promoted. A system in which a QR code is posted at the entrance of a shelter and scanning it shows the shelter's rules, the times of distributions, and information on medical support in multiple languages has already been introduced by many local governments.
The advantage of QR codes is that they are likely to keep working even during a disaster. Even when the internet connection is unstable, if you make the QR code's destination a PWA (Progressive Web App) that supports caching, content that has been loaded once can be viewed offline. A QR code printed on paper, unlike electronic bulletin boards and digital signage, continues to exist physically even during a power outage.
Technical Challenges and Future Outlook
QR codes with automatic multi-language switching have several technical challenges.
Accuracy of language detection: The Accept-Language header is based on the smartphone's OS language setting. If a Chinese person living in Japan uses a smartphone set to Japanese, the Japanese page appears instead of the Chinese one. A common countermeasure for this problem is to show a language selection screen on the first visit and save the choice in a cookie.
Maintaining translation quality: The quality of multilingual content depends on the accuracy of the translation. The accuracy of machine translation is improving, but in highly specialized fields such as medicine and law, supervision by experts is essential. If the information provided through a QR code is inaccurate, there is a risk of real harm to users.