diff --git a/.gitignore b/.gitignore
index dd77799..62103ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,8 +3,9 @@
 *.pyc
 *_flymake
 .coverage
-.sass-cache/
 .ropeproject/
+.sass-cache/
+.tox/
 nose.cfg
 MANIFEST
 _build/
diff --git a/.travis.yml b/.travis.yml
index 7493fd0..61eb826 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: python
 python:
     - "2.7"
-    - "2.6"
+    - "3.3"
 before_install:
     # Dependencies to build PIL
     - sudo apt-get update -qq
diff --git a/README.rst b/README.rst
index 4dedc16..1ca4854 100644
--- a/README.rst
+++ b/README.rst
@@ -18,7 +18,7 @@ The idea behind Sigal is to ease the use of the javascript librairies like
 `galleria`_. These librairies do a great job to display the images, Sigal does
 what is missing: resize images, create thumbnails, generate html pages.
 
-Sigal is currently compatible only with Python 2.
+Sigal is compatible with Python 2.7 and 3.3.
 
 Links :
 
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 9faf201..9cf35d6 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -2,6 +2,13 @@
  Changelog
 ===========
 
+Version 0.6.dev
+~~~~~~~~~~~~~~~
+
+Released on 2013-xx-xx.
+
+- Add support for Python 3.3
+
 Version 0.5.1
 ~~~~~~~~~~~~~
 
diff --git a/setup.py b/setup.py
index f591bba..2f2adb1 100644
--- a/setup.py
+++ b/setup.py
@@ -22,8 +22,10 @@ with open('docs/changelog.rst') as f:
 
 # Load package meta from the pkgmeta module without loading the package.
 pkgmeta = {}
-execfile(os.path.join(os.path.dirname(__file__), 'sigal', 'pkgmeta.py'),
-         pkgmeta)
+pkgmeta_file = os.path.join(os.path.dirname(__file__), 'sigal', 'pkgmeta.py')
+with open(pkgmeta_file) as f:
+    code = compile(f.read(), 'pkgmeta.py', 'exec')
+    exec(code, pkgmeta)
 
 setup(
     name='sigal',
@@ -46,8 +48,10 @@ setup(
         'Environment :: Console',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2.6',
+        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.3',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Multimedia :: Graphics :: Viewers',
         'Topic :: Software Development :: Libraries :: Python Modules',
diff --git a/sigal/__init__.py b/sigal/__init__.py
index c4e1ec4..eb60a00 100644
--- a/sigal/__init__.py
+++ b/sigal/__init__.py
@@ -30,9 +30,9 @@ sigal is yet another python script to prepare a static gallery of images:
 * generate html pages.
 """
 
-from __future__ import absolute_import
+from __future__ import absolute_import, print_function
 
-import codecs
+import io
 import logging
 import os
 import sys
@@ -72,9 +72,9 @@ def init():
     from pkg_resources import resource_string
     conf = resource_string(__name__, 'templates/sigal.conf.py')
 
-    with codecs.open('sigal.conf.py', 'w', 'utf-8') as f:
+    with io.open('sigal.conf.py', 'w', 'utf-8') as f:
         f.write(conf)
-    print "Sample config file created: sigal.conf.py"
+    print("Sample config file created: sigal.conf.py")
 
 
 @arg('source', nargs='?', help='Input directory')
@@ -97,7 +97,7 @@ def build(source, destination, debug=False, verbose=False, force=False,
 
     settings_file = config or _DEFAULT_CONFIG_FILE
     if not os.path.isfile(settings_file):
-        logger.error("Settings file not found (%s)", settings_file)
+        logger.error("Settings file not found: %s", settings_file)
         sys.exit(1)
     settings = read_settings(settings_file)
 
@@ -108,8 +108,7 @@ def build(source, destination, debug=False, verbose=False, force=False,
 
     logger.info("Input  : %s", settings['source'])
     if not settings['source'] or not os.path.isdir(settings['source']):
-        logger.error("Input directory '%s' does not exist.",
-                     settings['source'])
+        logger.error("Input directory not found: %s", settings['source'])
         sys.exit(1)
 
     logger.info("Output : %s", settings['destination'])
@@ -138,7 +137,7 @@ def serve(path):
         Handler = SimpleHTTPServer.SimpleHTTPRequestHandler
         httpd = SocketServer.TCPServer(("", PORT), Handler, False)
 
-        print " * Running on http://127.0.0.1:%i/" % PORT
+        print(" * Running on http://127.0.0.1:{}/".format(PORT))
 
         try:
             httpd.allow_reuse_address = True
@@ -146,13 +145,14 @@ def serve(path):
             httpd.server_activate()
             httpd.serve_forever()
         except KeyboardInterrupt:
-            print '\nAll done!'
+            print('\nAll done!')
     else:
         sys.stderr.write("The '%s' directory doesn't exist.\n" % path)
 
 
 def main():
-    parser = ArghParser(description='Simple static gallery generator.',
-                        version=__version__)
+    parser = ArghParser(description='Simple static gallery generator.')
     parser.add_commands([init, build, serve])
+    parser.add_argument('--version', action='version',
+                        version='%(prog)s {}'.format(__version__))
     parser.dispatch()
diff --git a/sigal/compat.py b/sigal/compat.py
new file mode 100644
index 0000000..ad1002b
--- /dev/null
+++ b/sigal/compat.py
@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+
+import sys
+
+PY2 = sys.version_info[0] == 2
+
+if not PY2:
+    text_type = str
+    string_types = (str,)
+    unichr = chr
+else:
+    text_type = unicode  # NOQA
+    string_types = (str, unicode)  # NOQA
+    unichr = unichr
diff --git a/sigal/gallery.py b/sigal/gallery.py
index 2b4b9a7..2be0f4e 100644
--- a/sigal/gallery.py
+++ b/sigal/gallery.py
@@ -38,9 +38,13 @@ from PIL import Image as PILImage
 
 import sigal.image
 import sigal.video
+from . import compat
 from .settings import get_thumb
 from .writer import Writer
 
+if not compat.PY2:
+    from functools import reduce
+
 DESCRIPTION_FILE = "index.md"
 
 # Label with for the progress bar. The max value is 48 character = 80 - 32 for
@@ -69,7 +73,7 @@ class PathsDb(object):
         # basepath must to be a unicode string so that os.walk will return
         # unicode dirnames and filenames. If basepath is a str, we must
         # convert it to unicode.
-        if isinstance(path, str):
+        if compat.PY2 and isinstance(path, str):
             enc = locale.getpreferredencoding()
             self.basepath = path.decode(enc)
         else:
@@ -96,12 +100,18 @@ class PathsDb(object):
         }
 
         # get information for each directory
-        for path, dirnames, filenames in os.walk(self.basepath, followlinks=True):
+        for path, dirnames, filenames in os.walk(self.basepath,
+                                                 followlinks=True):
             relpath = os.path.relpath(path, self.basepath)
 
             # sort images and sub-albums by name
-            filenames.sort(cmp=locale.strcoll)
-            dirnames.sort(cmp=locale.strcoll)
+            if compat.PY2:
+                filenames.sort(cmp=locale.strcoll)
+                dirnames.sort(cmp=locale.strcoll)
+            else:
+                from functools import cmp_to_key
+                filenames.sort(key=cmp_to_key(locale.strcoll))
+                dirnames.sort(key=cmp_to_key(locale.strcoll))
 
             self.db['paths_list'].append(relpath)
             self.db[relpath] = {
diff --git a/sigal/image.py b/sigal/image.py
index 3ea069a..f505521 100644
--- a/sigal/image.py
+++ b/sigal/image.py
@@ -40,6 +40,8 @@ from pilkit.processors import Transpose, Adjust
 from pilkit.utils import save_image
 from datetime import datetime
 
+from . import compat
+
 
 def _has_exif_tags(img):
     return hasattr(img, 'info') and 'exif' in img.info
@@ -91,8 +93,7 @@ def generate_image(source, outname, settings, options=None):
 
     outformat = img.format or original_format or 'JPEG'
     logger.debug(u'Save resized image to {0} ({1})'.format(outname, outformat))
-    with open(outname, 'w') as fp:
-        save_image(img, fp, outformat, options=options, autoconvert=True)
+    save_image(img, outname, outformat, options=options, autoconvert=True)
 
 
 def generate_thumbnail(source, outname, box, fit=True, options=None):
@@ -109,8 +110,7 @@ def generate_thumbnail(source, outname, box, fit=True, options=None):
 
     outformat = img.format or original_format or 'JPEG'
     logger.debug(u'Save thumnail image: {0} ({1})'.format(outname, outformat))
-    with open(outname, 'w') as fp:
-        save_image(img, fp, outformat, options=options, autoconvert=True)
+    save_image(img, outname, outformat, options=options, autoconvert=True)
 
 
 def add_copyright(img, text):
@@ -185,7 +185,12 @@ def get_exif_tags(source):
             # Remove null bytes at the end if necessary
             date = data['DateTimeOriginal'].rsplit('\x00')[0]
             dt = datetime.strptime(date, '%Y:%m:%d %H:%M:%S')
-            simple['datetime'] = dt
+            dt = dt.strftime('%A, %d. %B %Y')
+
+            if compat.PY2:
+                simple['datetime'] = dt.decode('utf8')
+            else:
+                simple['datetime'] = dt
         except (ValueError, TypeError) as e:
             msg = u'Could not parse DateTimeOriginal of %s: %s' % (source, e)
             logger.warning(msg)
diff --git a/sigal/pkgmeta.py b/sigal/pkgmeta.py
index af3426a..0c76bc3 100644
--- a/sigal/pkgmeta.py
+++ b/sigal/pkgmeta.py
@@ -1,8 +1,8 @@
 # -*- coding:utf-8 -*-
 
 __title__ = 'sigal'
-__author__ = u"Simon Conseil"
-__version__ = "0.5.1"
-__license__ = "MIT"
+__author__ = 'Simon Conseil'
+__version__ = '0.6.0-dev'
+__license__ = 'MIT'
 __url__ = 'https://github.com/saimn/sigal'
 __all__ = ['__title__', '__author__', '__version__', '__license__', '__url__']
diff --git a/sigal/settings.py b/sigal/settings.py
index 32a18b8..b3af3e2 100644
--- a/sigal/settings.py
+++ b/sigal/settings.py
@@ -60,6 +60,7 @@ def get_thumb(settings, filename):
     """Return the path to the thumb.
 
     examples:
+    >>> default_settings = create_settings()
     >>> get_thumb(default_settings, "bar/foo.jpg")
     "bar/thumbnails/foo.jpg"
     >>> get_thumb(default_settings, "bar/foo.png")
@@ -96,8 +97,12 @@ def read_settings(filename=None):
     if filename:
         logger.debug("Settings file: %s", filename)
         tempdict = {}
-        execfile(filename, tempdict)
-        settings.update((k, v) for k, v in tempdict.iteritems()
+
+        with open(filename) as f:
+            code = compile(f.read(), filename, 'exec')
+            exec(code, tempdict)
+
+        settings.update((k, v) for k, v in tempdict.items()
                         if k not in ['__builtins__'])
 
         # Make the paths relative to the settings file
diff --git a/sigal/themes/colorbox/templates/index.html b/sigal/themes/colorbox/templates/index.html
index f338175..bad0c7c 100644
--- a/sigal/themes/colorbox/templates/index.html
+++ b/sigal/themes/colorbox/templates/index.html
@@ -78,7 +78,7 @@
             {% if media.big %} data-big="{{ media.big }}"{% endif %}
             {% if media.exif %}
               {% if media.exif.datetime %}
-                data-date=", {{ media.exif.datetime.strftime('%d %B %Y') }}"
+                data-date=", {{ media.exif.datetime }}"
               {% endif %}
             {% endif %}
           {%- endmacro %}
diff --git a/sigal/themes/galleria/templates/index.html b/sigal/themes/galleria/templates/index.html
index 1f22380..979a918 100644
--- a/sigal/themes/galleria/templates/index.html
+++ b/sigal/themes/galleria/templates/index.html
@@ -67,7 +67,7 @@
               {% if media.exif.exposure %}Exposure: {{ media.exif.exposure }}, {% endif %}
               {% if media.exif.fstop %}Fstop: {{ media.exif.fstop }}{% endif %}
               {% if media.exif.datetime %}
-                <br>Date: {{ media.exif.datetime.strftime('%A, %d. %B %Y') }}
+                <br>Date: {{ media.exif.datetime }}
               {% endif %}
             {% endif %}
           {%- endmacro %}
diff --git a/sigal/video.py b/sigal/video.py
index 5ef4eb0..c3b2aad 100644
--- a/sigal/video.py
+++ b/sigal/video.py
@@ -27,6 +27,8 @@ import re
 import shutil
 import sigal.image
 
+from . import compat
+
 
 def vid_size(source):
     """Returns the dimensions of the video"""
@@ -35,6 +37,10 @@ def vid_size(source):
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
     stdout, stderr = p.communicate()
+
+    if not compat.PY2:
+        stderr = stderr.decode('utf8')
+
     match = pattern.search(stderr)
     if match:
         x, y = int(match.groups()[0]), int(match.groups()[1])
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..c313f00
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,14 @@
+[tox]
+envlist = py27,py33
+
+[testenv]
+commands = py.test
+deps =
+
+[testenv:py27]
+deps =
+    pytest
+
+[testenv:py33]
+deps =
+    pytest