A jet former (1), which can be fitted into the water outlet (2) of a sanitary outlet fitting and has at least one homogenizing device (3) with a multiplicity of throughflow holes (4), which are respectively enclosed by flow guiding walls (5). The jet former (1) has a greater jet width (1) in comparison with the jet depth (t) to create a flat water jet, by a flow guide (6) that tapers in a nozzle-like manner, at least in a partial region in the direction of throughflow, being arranged upstream or downstream of the at least one homogenizing device (3) and by the flow guide (6) having on both sides of its longitudinal extent edge regions (7, 8) with a greater throughflow cross section in comparison with the longitudinal center region (9). While a smooth, homogenized jet with a transparent, clear jet pattern can be formed with the aid of the homogenizing device (3) and its throughflow holes (4) enclosed by flow guiding walls (5), this jet can be continued as a clearly contoured, flat water jet over a comparatively long free distance by the flow guide (6).