diff --git a/snakeviz/cli.py b/snakeviz/cli.py
index b33a9b8..0307487 100644
--- a/snakeviz/cli.py
+++ b/snakeviz/cli.py
@@ -14,9 +14,9 @@
 from pstats import Stats
 
 try:
-    from urllib.parse import quote
+    from urllib.parse import quote, quote_plus
 except ImportError:
-    from urllib import quote
+    from urllib import quote, quote_plus
 
 from . import version
 
@@ -45,9 +45,9 @@ def error(self, message):
 
 def build_parser():
     parser = SVArgumentParser(
-        description='Start SnakeViz to view a Python profile.')
+        description='Start SnakeViz to view a Python profile. If multiple profiles are provided, they are merged and loaded as one.')
 
-    parser.add_argument('filename', help='Python profile to view')
+    parser.add_argument('profile', nargs='+', help='Python profile(s) to view, or directory containing profiles')
 
     parser.add_argument('-v', '--version', action='version',
                         version=('%(prog)s ' + version.version))
@@ -79,10 +79,7 @@ def main(argv=None):
     if args.browser and args.server:
         parser.error("options --browser and --server are mutually exclusive")
 
-    filename = os.path.abspath(args.filename)
-    if not os.path.exists(filename):
-        parser.error('the path %s does not exist' % filename)
-
+    filename = os.path.abspath(args.profile[0])
     if not os.path.isdir(filename):
         try:
             open(filename)
@@ -101,6 +98,31 @@ def main(argv=None):
 
     filename = quote(filename, safe='')
 
+    paths = [os.path.abspath(p) for p in args.profile]
+    for p in paths:
+        if not os.path.exists(p):
+            parser.error('path %s does not exist' % p)
+
+    # A single directory is allowed
+    if len(paths) == 1 and os.path.isdir(paths[0]):
+        pass # OK
+    else:
+        for p in paths:
+            if os.path.isdir(p):
+                parser.error('May only specify a single directory: "%s" is a directory' % p)
+            try:
+                Stats(p)
+            except IOError as e:
+                parser.error('the file %s could not be opened: %s'
+                             % (filename, str(e)))
+            except:
+                parser.error(('the file %s is not a valid profile. ' % p) +
+                             'Generate profiles using: \n\n'
+                             '\tpython -m cProfile -o my_program.prof my_program.py\n')
+
+    paths='&'.join(paths)
+    paths = quote_plus(paths)
+            
     hostname = args.hostname
     port = args.port
 
@@ -137,7 +159,7 @@ def main(argv=None):
         print('No available port found.')
         return 1
 
-    url = "http://{0}:{1}/snakeviz/{2}".format(hostname, port, filename)
+    url = "http://{0}:{1}/snakeviz/{2}".format(hostname, port, paths)
     print(('snakeviz web server started on %s:%d; enter Ctrl-C to exit' %
            (hostname, port)))
     print(url)
diff --git a/snakeviz/main.py b/snakeviz/main.py
index e0595c3..a352151 100644
--- a/snakeviz/main.py
+++ b/snakeviz/main.py
@@ -5,9 +5,9 @@
 import json
 
 try:
-    from urllib.parse import quote
+    from urllib.parse import quote, unquote_plus
 except ImportError:
-    from urllib import quote
+    from urllib import quote, unquote_plus
 
 import tornado.ioloop
 import tornado.web
@@ -23,17 +23,21 @@
 
 
 class VizHandler(tornado.web.RequestHandler):
-    def get(self, profile_name):
-        abspath = os.path.abspath(profile_name)
-        if os.path.isdir(abspath):
-            self._list_dir(abspath)
+    def get(self, profiles):
+        profiles = unquote_plus(profiles)
+        individual_profiles = profiles.split('&')
+
+        # abspath = os.path.abspath(profile_name)  Already absolute from client
+        if len(individual_profiles) == 1 and os.path.isdir(individual_profiles[0]):
+            self._list_dir(individual_profiles[0])
         else:
+            display_name = 'Multiple profiles' if len(individual_profiles)>1 else individual_profiles[0]
             try:
-                s = Stats(profile_name)
-            except:
-                raise RuntimeError('Could not read %s.' % profile_name)
+                s = Stats(*individual_profiles)  # Merge one or more profiles
+            except Exception as e:
+                raise RuntimeError('Error getting stats for %s: %s' % (individual_profiles, str(e)))
             self.render(
-                'viz.html', profile_name=profile_name,
+                'viz.html', display_name=display_name,
                 table_rows=table_rows(s), callees=json_stats(s))
 
     def _list_dir(self, path):
diff --git a/snakeviz/templates/viz.html b/snakeviz/templates/viz.html
index 2091843..c328146 100644
--- a/snakeviz/templates/viz.html
+++ b/snakeviz/templates/viz.html
@@ -2,7 +2,7 @@
 <html>
   <head>
     <meta charset="utf-8" .>
-    <title>{{profile_name.split('/')[-1].split('.')[0]}}</title>
+    <title>{{display_name.split('/')[-1].split('.')[0]}}</title>
 
     <meta name="viewport" content="width=device-width, initial-scale=1.0">