Bertifier is a Web app for rapidly creating tabular visualizations from spreadsheets. It directly draws from Jacques Bertin’s matrix analysis method, whose goal was to "simplify without destroying" by encoding cell values visually and grouping similar rows and columns. Bertifier has the potential to bring Bertin’s method to a wide audience of both technical and non-technical users, and empower them with data analysis and communication tools that were so far only accessible to a handful of specialists. www.aviz.fr/Bertifier contains additional material materials, a tutorial, and a link to the online open-source application.