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Kanzelh\"ohe Observatory for Solar and Environmental Research (KSO) of theUniversity of Graz (Austria) is in continuous operation since its foundation in1943. Since the beginning its main task was the regular observation of the Sunin full disc. In this long time span covering almost seven solar cycles, asubstantial amount of data was collected, which is made available online. Inthis paper we describe the separate processing steps from data acquisition tohigh level products for the different observing wavelengths. First of all wework out in detail the quality classification, which is important for furtherprocessing of the raw images. We show how we construct centre-to-limb variation(CLV) profiles and how we remove large scale intensity variations produced bythe telescope optics in order to get images with uniform intensity andcontrast. Another important point is an overview of the different data productsfrom raw images to high contrast images with heliographic grids overlaid. Asthe data products are accessible via different sources we also present how toget information about the availability and how to obtain these data. Finally,in an appendix, we describe in detail the information in the FITS headers, thefile naming and the data hierarchy.

Kanzelh\"ohe Observatory: instruments, data processing and data products