The search engine uses the electronic version of the dictionary in the DjVu format available in the digital library of the University of Warsaw since February 2008. The eight volumes of the dictionary have 7667 pages in total, including 7541 pages with entries (the figures come from Magdalena Majdak's book “Słownik warszawski. Kocepcja - Realizacja — Recepcja”, Warszawa 2008).

OCR on the scans was done by the library staff, namely Tomasz Trynkowski and Grzegorz Kłębek, with Abby FineReader version 8.

The OCR results has been converted to the suitable corpus format by Jakub Wilk. The corpus text consists of ca. 11 million segments. This is the version 2 of the corpus, available since January 6, 2010.