diff --git a/api/s34_sa_cal.py b/api/s34_sa_cal.py
index 078fcc8..41fabd4 100644
--- a/api/s34_sa_cal.py
+++ b/api/s34_sa_cal.py
@@ -115,7 +115,7 @@ def _calculate_service_area(name: str, inp, time_index: int = 0) -> dict[str, li
 
 
 def calculate_service_area(name: str) -> list[dict[str, list[str]]]:
-    inp = json.loads(run_project(name))
+    inp = json.loads(run_project(name, True))
 
     result: list[dict[str, list[str]]] = []
 
diff --git a/epanet/epanet.py b/epanet/epanet.py
index 7cf89e1..9c8bf24 100644
--- a/epanet/epanet.py
+++ b/epanet/epanet.py
@@ -3,6 +3,7 @@ import platform
 import os
 import sys
 import json
+import base64
 from typing import Any
 sys.path.append("..") 
 from api import project
@@ -232,10 +233,13 @@ def dump_report(path: str) -> str:
 
 
 def dump_output_binary(path: str) -> str:
-    return open(path, 'rb').read()
+    with open(path, 'rb') as f:
+        data = f.read()
+        bast64_data = base64.b64encode(data)
+        return str(bast64_data, 'utf-8')
 
 
-def run_project(name: str) -> str:
+def run_project(name: str, readable_output: bool = False) -> str:
     if not project.have_project(name):
         raise Exception(f'Not found project [{name}]')
 
@@ -258,8 +262,10 @@ def run_project(name: str) -> str:
         data['simulation_result'] = 'failed'
     else:
         data['simulation_result'] = 'successful'
-        # data |= _dump_output(opt)
-        data['output'] = dump_output_binary(opt)
+        if readable_output:
+            data |= _dump_output(opt)
+        else:
+            data['output'] = dump_output_binary(opt)
 
     data['report'] = dump_report(rpt)