In Chartres, an unprecedented innovation: AI brings the stained glass windows of the cathedral to life

In Chartres, a remarkable innovation is emerging thanks to the use of artificial intelligence, offering a new perspective on the cathedral’s thousand-year-old stained-glass windows. This revolutionary application, heralded as a « world first, » allows visitors to decipher the mysteries of these Gothic works using their smartphones, transforming a cultural stroll into an immersive and interactive experience. Available at the end of October 2025, it promises to progressively enrich the discovery of Chartres’ rich heritage. In Chartres, an unprecedented innovation: AI brings the cathedral’s stained-glass windows to life. October 31, 2025, marks an important date for the city of Chartres with the launch of a revolutionary application using artificial intelligence to bring the famous stained-glass windows of its cathedral to life. Described as a « world first, » this application allows the public to discover the hidden secrets of the stained-glass windows through their smartphones. This innovation is not just a technological feat; It also represents an act of cultural mediationand the promotion of Gothic heritage. Technology at the service of Gothic artThe idea of ​​making the complex stories and iconographic representations of the stained-glass windows of Chartres Cathedral accessible emerged from a simple observation. Jean Touchard, in charge of digital projects and sponsorship for the International Stained Glass Center, noticed that many visitors were taking photos of the stained-glass windows without grasping their true meaning. This application now allows users to contemplate these thousand-year-old works in very high definition and discover their hidden secrets thanks to artificial intelligence.

Adapted facial recognition algorithms

The development of the application required an innovative use offacial recognition algorithms. As Jean Touchard explains, « Autonomous cars recognize signs. We transposed this logic to stained glass windows » so that they adapt to the changing light caused by the weather and the seasons. This process involved significant archiving and photography work, with nearly 3,000 photos used to populate the database, in accordance with heritage regulations. A pocket encyclopedia

With the application, users have access to a veritable « pocket encyclopedia » that brings together more than 10,000 medallions and 20,000 iconographic details. This project, led by Jean-François Lagier, required the writing of detailed descriptions, totaling 1.4 million characters. Félicité Schuler-Lagier, a guide in Chartres for twenty years, emphasizes that stained glass windows are not a poor man’s Bible. On the contrary, even in the Middle Ages, an informed understanding of these works required specific interpretive tools, which modern technology now helps to unlock.

A project funded by patronageThe application, which will be available free of charge, was primarily funded by

patronage

to the tune of €270,000. The ambition of this innovation is to offer an educational tool, particularly for younger generations, by making Gothic art accessible in a fun way. « When we explain it to them, they are fascinated, » says Félicité Schuler-Lagier, speaking of the application’s ability to capture the imagination. A model for world heritage

While this application is a world first in Chartres, it is already raising the question of its potential for expansion to other heritage sites in France and around the world. Jean Touchard notes that this tool is not a traditional method of heritage preservation, but a valuable approach to

cultural mediation.

and promotion. « If it works in Chartres, why not elsewhere? » he suggests, paving the way for a revolution in the way historical heritage is perceived and understood in the digital age.

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