diff --git a/make-pages/GalleryPage.hs b/make-pages/GalleryPage.hs
index ac2a9de..04f75fc 100644
--- a/make-pages/GalleryPage.hs
+++ b/make-pages/GalleryPage.hs
@@ -2,8 +2,10 @@
 module GalleryPage (make) where
 
 import Control.Exception
+import Data.Foldable
 import Data.Function (on, (&))
-import Data.List (sortOn, groupBy)
+import qualified Data.HashMap.Strict as HashMap
+import Data.List (intersperse, groupBy, sortOn)
 import qualified Data.Text.Lazy as Lazy
 import System.FilePath ((</>), takeDirectory, joinPath, splitPath)
 import GHC.Exts (Down (..), the)
@@ -61,6 +63,12 @@ make' title prefix nsfw infos = [b|@0
       then group by Down year using groupBy']
   groupBy' f = groupBy ((==) `on` f)
   undir = joinPath (replicate (length (splitPath prefix)) "..")
+  allTags = infos
+    & concatMap (map (,1) . tagsFor nsfw . #second)
+    & HashMap.fromListWith (+) & HashMap.toList
+    & sortOn (\(tag, count) -> (Down count, tag))
+  requireFilters = map (uncurry $ makeFilter "require") allTags
+  excludeFilters = map (uncurry $ makeFilter "exclude") allTags
 
 makeYearItems :: Bool -- ^ nsfw
               -> Integer -- ^ year
@@ -77,7 +85,7 @@ makeYearItems nsfw year infos = [b|@4
 
 makeItem :: Bool -> FilePath -> Info -> Builder
 makeItem nsfw file info@(Info {title}) = [b|@4
-    <li class="item post$nsfw'">
+    <li class="item post$nsfw'" data-tags="$tags'">
       <figure>
         <a href="$@dir">
           <img src="$@thumb">
@@ -89,3 +97,4 @@ makeItem nsfw file info@(Info {title}) = [b|@4
   dir   = takeDirectory file
   thumb = maybe (throw $ NoThumb dir) (\t -> dir </> thumbFile t) $ #thumb info
   nsfw' = if nsfw && #anyNsfw info then " nsfw" else ""
+  tags' = fold $ intersperse ";" $ map fromText $ tagsFor nsfw info