diff --git a/daqviewer/daqviewer.py b/daqviewer/daqviewer.py
index 3d9e2fd..db103d5 100644
--- a/daqviewer/daqviewer.py
+++ b/daqviewer/daqviewer.py
@@ -76,6 +76,9 @@ def parse_contents(contents, filename):
     # Zero time series based on first 5s
     df -= df[:5].mean()
 
+    # Round dataframe to save disk space
+    df = df.round(1)
+
     ts = []
     for col in df.columns:
         trace = go.Scatter(x=df.index, y=df[col], name=col, opacity=0.8)