diff --git a/make-pages/GalleryPage.hs b/make-pages/GalleryPage.hs
index 99c69ca..0b4d784 100644
--- a/make-pages/GalleryPage.hs
+++ b/make-pages/GalleryPage.hs
@@ -96,7 +96,7 @@ make' root (GalleryInfo {title, desc, prefix, filters, hidden}) infos = [b|
   undir = joinPath (replicate (length (splitPath prefix)) "..")
 
   allTags = infos
-    & concatMap (map (,1) . tagsFor nsfw . snd)
+    & concatMap (map (,1) . HashSet.toList . tagsFor nsfw . snd)
     & HashMap.fromListWith (+) & HashMap.toList
     & sort
 
@@ -160,7 +160,8 @@ makeItem nsfw file info@(Info {bg}) = [b|
   dir       = takeDirectory file
   thumbnail = getThumb dir info
   nsfw'     = if nsfw && anyNsfw info then [b|$& nsfw|] else ""
-  tags'     = fold $ intersperse ";" $ map fromText $ tagsFor nsfw info
+  tags'     = fold $ intersperse ";" $ map fromText $
+              sort $ HashSet.toList $ tagsFor nsfw info
   date      = latestDateFor nsfw info
   date'     = formatTooltip date
   year'     = date.year
diff --git a/make-pages/Info.hs b/make-pages/Info.hs
index b13b003..a661c17 100644
--- a/make-pages/Info.hs
+++ b/make-pages/Info.hs
@@ -41,7 +41,7 @@ import qualified Data.Map.Strict as Map
 import Data.Set (Set, (\\))
 import qualified Data.Set as Set
 import Data.Maybe (isJust, isNothing, fromMaybe, mapMaybe, catMaybes)
-import Data.List (nub, sortBy)
+import Data.List (sortBy)
 import Data.List.NonEmpty (NonEmpty (..), toList, nonEmpty)
 import Data.Ord (comparing)
 import Data.String (IsString)
@@ -69,8 +69,8 @@ data Info =
     galleryTitle :: !(Maybe Text),
     artist       :: !(Maybe Artist), -- nothing = me, obv
     nsfwOnly     :: !Bool,
-    tags         :: ![Text],
-    nsfwTags     :: ![Text],
+    tags         :: !(HashSet Text),
+    nsfwTags     :: !(HashSet Text),
     desc         :: !Desc,
     nsfwDesc     :: !Desc,
     bg           :: !Bg,
@@ -246,8 +246,8 @@ instance HasField "exists" Desc Bool where
 descFor :: Bool -> Info -> Desc
 descFor nsfw (Info {desc, nsfwDesc}) = if nsfw then desc <> nsfwDesc else desc
 
-tagsFor :: Bool -> Info -> [Text]
-tagsFor nsfw i = if nsfw then nub $ i.tags <> i.nsfwTags else i.tags
+tagsFor :: Bool -> Info -> HashSet Text
+tagsFor nsfw i = if nsfw then i.tags <> i.nsfwTags else i.tags
 
 imagesFor :: Bool -> Info -> Maybe Images
 imagesFor nsfw i = if nsfw then Just i.images else sfwImages i
@@ -488,9 +488,8 @@ noFilters =
 matchFilters :: GalleryFilters -> Info -> Bool
 matchFilters (GalleryFilters {nsfw, artist, require, exclude}) i =
   matchNsfw nsfw i && matchArtist artist i &&
-  all (\t -> HashSet.member t tags) require &&
-  all (\t -> not $ HashSet.member t tags) exclude
- where tags = HashSet.fromList i.tags
+  all (\t -> HashSet.member t i.tags) require &&
+  all (\t -> not $ HashSet.member t i.tags) exclude
 
 
 instance FromYAML GalleryInfo where
diff --git a/make-pages/ListTags.hs b/make-pages/ListTags.hs
index 2cbb08f..dc7e117 100644
--- a/make-pages/ListTags.hs
+++ b/make-pages/ListTags.hs
@@ -38,7 +38,8 @@ stats1 nsfw path (Info {tags, nsfwTags}) =
   if null tags' then
     Stats {tags = [], untagged = [path]}
   else
-    Stats {tags = HashMap.fromList $ map (, 1) tags', untagged = []}
+    let tagMap = HashMap.fromList $ map (, 1) $ HashSet.toList tags' in
+    Stats {tags = tagMap, untagged = []}
 
 stats :: Bool -> [(FilePath, Info)] -> Stats
 stats nsfw = foldMap $ uncurry $ stats1 nsfw
diff --git a/make-pages/SinglePage.hs b/make-pages/SinglePage.hs
index 1173cef..f800f06 100644
--- a/make-pages/SinglePage.hs
+++ b/make-pages/SinglePage.hs
@@ -13,7 +13,8 @@ import Data.Maybe (fromMaybe, isJust)
 import qualified Data.Text as Strict
 import qualified Data.Text.Lazy as Lazy
 import System.FilePath (joinPath, splitPath)
-import qualified Data.HashSet as Set
+import Data.HashSet (HashSet)
+import qualified Data.HashSet as HashSet
 import Data.Traversable
 import Data.Semigroup
 import Data.List.NonEmpty (toList)
@@ -242,9 +243,9 @@ filterI :: (a -> Bool) -> Inf a -> Inf a
 filterI p (x :> xs) = if p x then x :> filterI p xs else filterI p xs
 
 addIds :: Traversable t => t Image -> t (Image, Text)
-addIds = snd . mapAccumL makeId Set.empty where
-  makeId used img = (Set.insert newId used, (img, newId)) where
-    newId = headI $ filterI (\i -> not $ i `Set.member` used) ids
+addIds = snd . mapAccumL makeId HashSet.empty where
+  makeId used img = (HashSet.insert newId used, (img, newId)) where
+    newId = headI $ filterI (\i -> not $ i `HashSet.member` used) ids
     ids   = fmap (\i -> toStrictText [b|$label$i|]) suffixes
     label = escId $ img.label
 
@@ -314,7 +315,7 @@ altButton img i = [b|
   warning'       = ifJust warning \(escAttr -> w) -> [b|$& data-warning="$w"|]
   alt            = img.desc
 
-makeTags :: FilePath -> [Strict.Text] -> Builder
+makeTags :: FilePath -> HashSet Strict.Text -> Builder
 makeTags undir tags =
   if null tags then "" else [b|
     <nav id=tags class=info-section>
@@ -325,7 +326,7 @@ makeTags undir tags =
     </nav>
   |]
  where
-  tagList = map makeTag tags
+  tagList = map makeTag $ sort $ HashSet.toList tags
   makeTag tag = [b|<li><a href="$undir#require_$tag'">$tag</a>|]
     where tag' = escId tag