diff --git a/app/Main.hs b/app/Main.hs
index 48e7072..c6d4eea 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -61,17 +61,17 @@ app :: Application
 app = serve (Proxy :: Proxy API) server
 
 type API =
-  "bytes" :> Capture "bytes" Text :> Get '[PlainText, HTML] BytesModel
+  "utf8" :> Capture "bytes" Text :> Get '[PlainText, HTML] Utf8Model
   :<|> "codepoints" :> Capture "codepoints" Text :> Get '[PlainText, HTML] CodepointsModel
   :<|> "text" :> Capture "text" Text :> Get '[HTML] TextModel
 
 server :: Server API
 server =
-  bytesR :<|> codepointsR :<|> textR
+  utf8R :<|> codepointsR :<|> textR
   where
-    bytesR bytesP = do
+    utf8R bytesP = do
       bytes <- Parsers.parseHexBytes bytesP `orThrow` const err400
-      pure $ BytesModel $ Decode.decodeUtf8 bytes
+      pure $ mkUtf8Model bytes
 
     codepointsR codepointsP = do
       codepoints' <- Parsers.parseCodepoints codepointsP `orThrow` const err400
@@ -82,11 +82,14 @@ server =
 
 -- /bytes/<bytes>
 
-newtype BytesModel = BytesModel
+newtype Utf8Model = Utf8Model
   { codepoints :: [([Word8], Either String Char)]
   }
 
-instance MimeRender PlainText BytesModel where
+mkUtf8Model :: [Word8] -> Utf8Model
+mkUtf8Model = Utf8Model . Decode.decodeUtf8
+
+instance MimeRender PlainText Utf8Model where
   mimeRender _ model = renderText $
     Table.render "  " $ concat
       [ [ [ Table.cl $ Text.pack $ unwords $ map showByteHex bytes
@@ -107,7 +110,7 @@ instance MimeRender PlainText BytesModel where
       | (bytes, eiC) <- model.codepoints
       ]
 
-instance MimeRender HTML BytesModel where
+instance MimeRender HTML Utf8Model where
   mimeRender _ model = renderHtml $ documentWithBody $ do
     H.table $ for_ model.codepoints $ \(bytes, eiC) -> do
       H.tr $ do