diff --git a/npy_to_largeviz_txt.py b/npy_to_largeviz_txt.py
new file mode 100755
index 0000000..bb2136d
--- /dev/null
+++ b/npy_to_largeviz_txt.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python
+
+"""Tool for converting a numpy array file `input.npy` to the type of file that
+LargeViz expects as input, `input.npy.txt`.
+
+TODO: `.npz` support
+
+References:
+
+- https://docs.scipy.org/doc/numpy/reference/generated/numpy.savez.html
+- https://docs.scipy.org/doc/numpy/reference/generated/numpy.save.html
+- https://docs.scipy.org/doc/numpy/reference/generated/numpy.load.html
+- https://docs.scipy.org/doc/numpy/neps/npy-format.html
+
+"""
+
+import csv
+import logging
+import sys
+
+import numpy as np
+
+
+logger = logging.getLogger(__name__)
+
+
+def npy_to_largeviz_txt(filename_input, filename_output=None):
+    logger.info("npy_to_largeviz_txt() on %s", filename_input)
+    data = np.load(filename_input)
+    if not filename_output:
+        filename_output = '%s.txt' % filename_input
+    logger.info("Saving result to %s", filename_output)
+    with open(filename_output, 'w') as fp:
+        writer = csv.writer(fp, delimiter=' ')
+        writer.writerow(data.shape)
+        for vector in data:
+            writer.writerow(vector.tolist())
+
+
+def largeviz_txt_to_npy(filename_input, filename_output=None):
+    logger.info("largeviz_txt_to_npy() on %s", filename_input)
+    with open(filename_input, 'r') as fp:
+        reader = csv.reader(fp, delimiter=' ')
+        shape = map(int, reader.next())
+        logger.info("shape=%s", shape)
+        vectors = np.zeros(shape)
+        for row_num, row in enumerate(reader):
+            vectors[row_num, :] = np.array(row)
+    if not filename_output:
+        filename_output = '%s.npy' % filename_input
+    logger.info("Saving result to %s", filename_output)
+    np.save(filename_output, vectors)
+
+
+def setup_logger():
+    logger.setLevel(logging.INFO)
+    logger.handlers = []
+    formatter = logging.Formatter('%(asctime)s [%(levelname)s]: %(message)s',
+                                  '%Y-%m-%d %H:%M:%S')
+    stream_handler = logging.StreamHandler()
+    stream_handler.setLevel(logging.INFO)
+    stream_handler.setFormatter(formatter)
+    logger.addHandler(stream_handler)
+
+
+def main():
+    setup_logger()
+    filename_input = sys.argv[1]
+    filename_output = len(sys.argv) > 2 and sys.argv[2]
+    if filename_input.endswith('.txt'):
+        largeviz_txt_to_npy(filename_input, filename_output)
+    else:
+        npy_to_largeviz_txt(filename_input, filename_output)
+
+
+if __name__ == '__main__':
+    main()