Leonardotheka, a groundbreaking online platform, has successfully reunited two monumental collections of Leonardo da Vinci’s works, creating the most comprehensive digital resource dedicated to his legacy. This ambitious project, which took over a decade to complete, brings together approximately 3,500 pages of da Vinci's writings and drawings, including 1,119 sheets from the Codex Atlanticus and around 550 sheets from the Royal Collection at Windsor. The initiative involved collaboration among the Royal Collection Trust, the Veneranda Biblioteca Ambrosiana in Milan, the Biblioteca Leonardiana in Vinci, and Museo Galileo. Experts meticulously reassembled manuscripts that had been dismounted and cut centuries ago. A notable feature of Leonardotheka is the inclusion of 50 confirmed page reconstructions, which digitally return fragments to their original positions, thereby restoring context. For instance, a drawing of a horse has been reunited with its reflection on the Regisole equestrian monument. Scholars anticipate that Leonardotheka will unlock new insights into da Vinci’s thoughts, artistic vision, and working processes, offering unprecedented opportunities to explore his artistic, scientific, and literary contributions.