diff --git a/boards/forms.py b/boards/forms.py
--- a/boards/forms.py
+++ b/boards/forms.py
@@ -62,6 +62,8 @@ MIMETYPE_EXTENSIONS = {
     'x-diff': 'diff',
     'image/svg+xml': 'svg',
     'application/x-shockwave-flash': 'swf',
+    'image/x-ms-bmp': 'bmp',
+    'image/bmp': 'bmp',
 }
 
 
diff --git a/boards/static/css/md/base_page.css b/boards/static/css/md/base_page.css
--- a/boards/static/css/md/base_page.css
+++ b/boards/static/css/md/base_page.css
@@ -121,6 +121,7 @@ body {
 
 .tag_info > .tag-text-data {
     text-align: left;
+    max-width: 30em;
 }
 
 .header {