diff --git a/swash/config.ini b/swash/config.ini
index cd285dd..a39acf8 100644
--- a/swash/config.ini
+++ b/swash/config.ini
@@ -17,6 +17,8 @@ out=out_sws
 mpi=4
 
 [post]
+inp=inp_post
 out=out_post
 dt=0.25
 x0=125
+t0=180
diff --git a/swash/processing/sws_npz.py b/swash/processing/sws_npz.py
new file mode 100644
index 0000000..569edc0
--- /dev/null
+++ b/swash/processing/sws_npz.py
@@ -0,0 +1,35 @@
+import argparse
+import configparser
+import pathlib
+import logging
+
+import pandas as pd
+
+
+parser = argparse.ArgumentParser(description="Convert swash output to numpy")
+parser.add_argument("-v", "--verbose", action="count", default=0)
+args = parser.parse_args()
+
+logging.basicConfig(level=max((10, 20 - 10 * args.verbose)))
+log = logging.getLogger("post")
+
+log.info("Starting sws -> npz converter")
+config = configparser.ConfigParser()
+config.read("config.ini")
+
+data_out = pathlib.Path(config.get("data", "out"))
+sws_out = pathlib.Path(config.get("swash", "out"))
+inp = pathlib.Path(config.get("post", "inp"))
+
+log.info(f"Reading bathymetry from '{data_out}'")
+bathy = pd.read_hdf(data_out.joinpath("bathy.h5"), "bathy")
+n_x = bathy.index.size
+
+log.info(f"Reading swash output from '{sws_out}'")
+botl_np = read_nohead_scalar(root.joinpath("botl.dat"), n_x)
+dep = np.maximum(0, read_nohead_scalar(root.joinpath("dep.dat"), n))
+vel = read_nohead_vect(root.joinpath("vel.dat"), n)
+
+botl.savez_compressed(inp.joinpath("botl"))
+dep.savez_compressed(inp.joinpath("dep"))
+vel.savez_compressed(inp.joinpath("vel"))