Tau lepton decays into hadrons are important for many physics analyses performed at the LHC. To achieve high precision in the measurements, the performance of the reconstruction and identification algorithms used for hadronically decaying tau leptons have to be well-known. This article details the performance measurements at ATLAS for data collected at the LHC in the years 2015 and 2016. The discussed algorithms, i.e. the trigger efficiency, the identification of hadronic tau decays, and the energy calibration, are determined to a level of precision of a few percent.