diff --git a/docs/configuration.rst b/docs/configuration.rst
index 5ef73b6..6fe6089 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -63,6 +63,7 @@ Currently a `gm` settings key allows to customize the default GraphicsMagick's b
         auto-orient: True
         strip: True
         resize: 50%
+        progressive: True
 
 The meaning of the currently supported GraphicsMagick's settings is as follows:
 
@@ -70,6 +71,7 @@ The meaning of the currently supported GraphicsMagick's settings is as follows:
  * `auto-orient` change the orientation of pictures so they are upright (based on corresponding EXIF tags if present)
  * `strip` removes all profiles and text attributes from the image (good for privacy, slightly reduce file size)
  * `resize` can be used to resize the fullsize version of pictures. by default, input image size is preserved
+ * `progressive` converts classic baseline JPEG files to progressive JPEG, and interlace PNG/GIF files (improve the page loading impression, slightly reduce file size)
 
 Any GraphicsMagick setting can be customized on a per-image basis (either `cover` or `image`, see below).
 
diff --git a/prosopopee/prosopopee.py b/prosopopee/prosopopee.py
index 08f3fdb..15aed08 100644
--- a/prosopopee/prosopopee.py
+++ b/prosopopee/prosopopee.py
@@ -22,7 +22,8 @@ SETTINGS = {
         "quality": 75,
         "auto-orient": True,
         "strip": True,
-        "resize": None
+        "resize": None,
+        "progressive": True
     },
     "ffmpeg": {
         "binary": "ffmpeg",
@@ -138,10 +139,11 @@ class Image(object):
            "auto-orient": "-auto-orient" if options["auto-orient"] else "",
            "strip": "-strip" if options["strip"] else "",
            "quality": "-quality %s" % options["quality"] if "quality" in options else "-define jpeg:preserve-settings",
-           "resize": "-resize %s" % options["resize"] if options.get("resize", None) is not None else ""
+           "resize": "-resize %s" % options["resize"] if options.get("resize", None) is not None else "",
+           "progressive": "-interlace Line" if options.get("progressive", None) is True else ""
         }
 
-        command = "gm convert {source} {auto-orient} {strip} {quality} {resize} {target}".format(**gm_switches)
+        command = "gm convert {source} {auto-orient} {strip} {progressive} {quality} {resize} {target}".format(**gm_switches)
         warning("Generation", source)
 
         print(command)