diff --git a/Language/Haskell/GhcMod/Browse.hs b/Language/Haskell/GhcMod/Browse.hs
index 717ea6b..74c5163 100644
--- a/Language/Haskell/GhcMod/Browse.hs
+++ b/Language/Haskell/GhcMod/Browse.hs
@@ -16,6 +16,7 @@ import Language.Haskell.GhcMod.Doc (showPage, showOneLine, styleUnqualified)
 import Language.Haskell.GhcMod.GHCApi
 import Language.Haskell.GhcMod.Gap
 import Language.Haskell.GhcMod.Monad
+import Language.Haskell.GhcMod.Convert
 import Language.Haskell.GhcMod.Types
 import Name (getOccString)
 import Outputable (ppr, Outputable)
diff --git a/Language/Haskell/GhcMod/Convert.hs b/Language/Haskell/GhcMod/Convert.hs
new file mode 100644
index 0000000..339be0f
--- /dev/null
+++ b/Language/Haskell/GhcMod/Convert.hs
@@ -0,0 +1,103 @@
+{-# LANGUAGE FlexibleInstances #-}
+
+module Language.Haskell.GhcMod.Convert where
+
+import Language.Haskell.GhcMod.Monad
+import Language.Haskell.GhcMod.Types
+
+import Control.Applicative ((<$>))
+
+type Builder = String -> String
+
+-- |
+--
+-- >>> replace '"' "\\\"" "foo\"bar" ""
+-- "foo\\\"bar"
+replace :: Char -> String -> String -> Builder
+replace _ _  [] = id
+replace c cs (x:xs)
+  | x == c    = (cs ++) . replace c cs xs
+  | otherwise = (x :) . replace c cs xs
+
+inter :: Char -> [Builder] -> Builder
+inter _ [] = id
+inter c bs = foldr1 (\x y -> x . (c:) . y) bs
+
+convert' :: ToString a => a -> GhcMod String
+convert' x = flip convert x <$> options
+
+convert :: ToString a => Options -> a -> String
+convert opt@Options { outputStyle = LispStyle  } x = toLisp  opt x "\n"
+convert opt@Options { outputStyle = PlainStyle } x
+  | str == "\n" = ""
+  | otherwise   = str
+  where
+    str = toPlain opt x "\n"
+
+class ToString a where
+    toLisp  :: Options -> a -> Builder
+    toPlain :: Options -> a -> Builder
+
+lineSep :: Options -> String
+lineSep opt = lsep
+  where
+    LineSeparator lsep = lineSeparator opt
+
+-- |
+--
+-- >>> toLisp defaultOptions "fo\"o" ""
+-- "\"fo\\\"o\""
+-- >>> toPlain defaultOptions "foo" ""
+-- "foo"
+instance ToString String where
+    toLisp  opt = quote opt
+    toPlain opt = replace '\n' (lineSep opt)
+
+-- |
+--
+-- >>> toLisp defaultOptions ["foo", "bar", "ba\"z"] ""
+-- "(\"foo\" \"bar\" \"ba\\\"z\")"
+-- >>> toPlain defaultOptions ["foo", "bar", "baz"] ""
+-- "foo\nbar\nbaz"
+instance ToString [String] where
+    toLisp  opt = toSexp1 opt
+    toPlain opt = inter '\n' . map (toPlain opt)
+
+-- |
+--
+-- >>> let inp = [((1,2,3,4),"foo"),((5,6,7,8),"bar")] :: [((Int,Int,Int,Int),String)]
+-- >>> toLisp defaultOptions inp ""
+-- "((1 2 3 4 \"foo\") (5 6 7 8 \"bar\"))"
+-- >>> toPlain defaultOptions inp ""
+-- "1 2 3 4 \"foo\"\n5 6 7 8 \"bar\""
+instance ToString [((Int,Int,Int,Int),String)] where
+    toLisp  opt = toSexp2 . map toS
+      where
+        toS x = ('(' :) . tupToString opt x . (')' :)
+    toPlain opt = inter '\n' . map (tupToString opt)
+
+toSexp1 :: Options -> [String] -> Builder
+toSexp1 opt ss = ('(' :) . inter ' ' (map (quote opt) ss) . (')' :)
+
+toSexp2 :: [Builder] -> Builder
+toSexp2 ss = ('(' :) . (inter ' ' ss) . (')' :)
+
+tupToString :: Options -> ((Int,Int,Int,Int),String) -> Builder
+tupToString opt ((a,b,c,d),s) = (show a ++) . (' ' :)
+                              . (show b ++) . (' ' :)
+                              . (show c ++) . (' ' :)
+                              . (show d ++) . (' ' :)
+                              . quote opt s -- fixme: quote is not necessary
+
+quote :: Options -> String -> Builder
+quote opt str = ("\"" ++) .  (quote' str ++) . ("\"" ++)
+  where
+    lsep = lineSep opt
+    quote' [] = []
+    quote' (x:xs)
+      | x == '\n' = lsep   ++ quote' xs
+      | x == '\\' = "\\\\" ++ quote' xs
+      | x == '"'  = "\\\"" ++ quote' xs
+      | otherwise = x       : quote' xs
+
+----------------------------------------------------------------
diff --git a/Language/Haskell/GhcMod/Debug.hs b/Language/Haskell/GhcMod/Debug.hs
index cfa0a35..8de00dc 100644
--- a/Language/Haskell/GhcMod/Debug.hs
+++ b/Language/Haskell/GhcMod/Debug.hs
@@ -7,6 +7,7 @@ import Data.List (intercalate)
 import Data.Maybe (fromMaybe, isJust, fromJust)
 import Language.Haskell.GhcMod.CabalApi
 import Language.Haskell.GhcMod.GHCApi
+import Language.Haskell.GhcMod.Convert
 import Language.Haskell.GhcMod.Types
 
 ----------------------------------------------------------------
diff --git a/Language/Haskell/GhcMod/Find.hs b/Language/Haskell/GhcMod/Find.hs
index 63e5d77..f5ee9ba 100644
--- a/Language/Haskell/GhcMod/Find.hs
+++ b/Language/Haskell/GhcMod/Find.hs
@@ -9,6 +9,7 @@ import GHC (Ghc)
 import qualified GHC as G
 import Language.Haskell.GhcMod.Browse (browseAll)
 import Language.Haskell.GhcMod.GHCApi
+import Language.Haskell.GhcMod.Convert
 import Language.Haskell.GhcMod.Types
 
 #ifndef MIN_VERSION_containers
diff --git a/Language/Haskell/GhcMod/Flag.hs b/Language/Haskell/GhcMod/Flag.hs
index cfd4e8a..ff00fde 100644
--- a/Language/Haskell/GhcMod/Flag.hs
+++ b/Language/Haskell/GhcMod/Flag.hs
@@ -1,6 +1,7 @@
 module Language.Haskell.GhcMod.Flag where
 
 import qualified Language.Haskell.GhcMod.Gap as Gap
+import Language.Haskell.GhcMod.Convert
 import Language.Haskell.GhcMod.Types
 
 -- | Listing GHC flags. (e.g -fno-warn-orphans)
diff --git a/Language/Haskell/GhcMod/Info.hs b/Language/Haskell/GhcMod/Info.hs
index 25dc417..0159fa5 100644
--- a/Language/Haskell/GhcMod/Info.hs
+++ b/Language/Haskell/GhcMod/Info.hs
@@ -25,6 +25,7 @@ import Language.Haskell.GhcMod.GHCApi
 import Language.Haskell.GhcMod.Gap (HasType(..), setDeferTypeErrors)
 import qualified Language.Haskell.GhcMod.Gap as Gap
 import Language.Haskell.GhcMod.Types
+import Language.Haskell.GhcMod.Convert
 import Outputable (PprStyle)
 import TcHsSyn (hsPatType)
 
diff --git a/Language/Haskell/GhcMod/Lang.hs b/Language/Haskell/GhcMod/Lang.hs
index 858d1b2..1ddc59a 100644
--- a/Language/Haskell/GhcMod/Lang.hs
+++ b/Language/Haskell/GhcMod/Lang.hs
@@ -2,6 +2,7 @@ module Language.Haskell.GhcMod.Lang where
 
 import DynFlags (supportedLanguagesAndExtensions)
 import Language.Haskell.GhcMod.Types
+import Language.Haskell.GhcMod.Convert
 
 -- | Listing language extensions.
 
diff --git a/Language/Haskell/GhcMod/Lint.hs b/Language/Haskell/GhcMod/Lint.hs
index 49a54f4..23515be 100644
--- a/Language/Haskell/GhcMod/Lint.hs
+++ b/Language/Haskell/GhcMod/Lint.hs
@@ -3,6 +3,7 @@ module Language.Haskell.GhcMod.Lint where
 import Control.Applicative ((<$>))
 import Control.Exception (handle, SomeException(..))
 import Language.Haskell.GhcMod.Logger (checkErrorPrefix)
+import Language.Haskell.GhcMod.Convert
 import Language.Haskell.GhcMod.Types
 import Language.Haskell.HLint (hlint)
 
diff --git a/Language/Haskell/GhcMod/List.hs b/Language/Haskell/GhcMod/List.hs
index e7565e9..5fcf32a 100644
--- a/Language/Haskell/GhcMod/List.hs
+++ b/Language/Haskell/GhcMod/List.hs
@@ -5,6 +5,7 @@ import Control.Exception (SomeException(..))
 import Data.List (nub, sort)
 import qualified GHC as G
 import Language.Haskell.GhcMod.Monad
+import Language.Haskell.GhcMod.Convert
 import Language.Haskell.GhcMod.Types
 import Packages (pkgIdMap, exposedModules, sourcePackageId, display)
 import UniqFM (eltsUFM)
diff --git a/Language/Haskell/GhcMod/Logger.hs b/Language/Haskell/GhcMod/Logger.hs
index 5654cf1..9039382 100644
--- a/Language/Haskell/GhcMod/Logger.hs
+++ b/Language/Haskell/GhcMod/Logger.hs
@@ -19,7 +19,8 @@ import HscTypes (SourceError, srcErrorMessages)
 import Language.Haskell.GhcMod.Doc (showPage, getStyle)
 import Language.Haskell.GhcMod.GHCApi (withDynFlags, withCmdFlags)
 import qualified Language.Haskell.GhcMod.Gap as Gap
-import Language.Haskell.GhcMod.Types (Options(..), convert)
+import Language.Haskell.GhcMod.Convert (convert)
+import Language.Haskell.GhcMod.Types (Options(..))
 import Outputable (PprStyle, SDoc)
 import System.FilePath (normalise)
 
diff --git a/Language/Haskell/GhcMod/Types.hs b/Language/Haskell/GhcMod/Types.hs
index 59f7ab1..b8bb908 100644
--- a/Language/Haskell/GhcMod/Types.hs
+++ b/Language/Haskell/GhcMod/Types.hs
@@ -1,5 +1,3 @@
-{-# LANGUAGE FlexibleInstances #-}
-
 module Language.Haskell.GhcMod.Types where
 
 import Data.List (intercalate)
@@ -39,98 +37,6 @@ defaultOptions = Options {
 
 ----------------------------------------------------------------
 
-type Builder = String -> String
-
--- |
---
--- >>> replace '"' "\\\"" "foo\"bar" ""
--- "foo\\\"bar"
-replace :: Char -> String -> String -> Builder
-replace _ _  [] = id
-replace c cs (x:xs)
-  | x == c    = (cs ++) . replace c cs xs
-  | otherwise = (x :) . replace c cs xs
-
-inter :: Char -> [Builder] -> Builder
-inter _ [] = id
-inter c bs = foldr1 (\x y -> x . (c:) . y) bs
-
-convert :: ToString a => Options -> a -> String
-convert opt@Options { outputStyle = LispStyle  } x = toLisp  opt x "\n"
-convert opt@Options { outputStyle = PlainStyle } x
-  | str == "\n" = ""
-  | otherwise   = str
-  where
-    str = toPlain opt x "\n"
-
-class ToString a where
-    toLisp  :: Options -> a -> Builder
-    toPlain :: Options -> a -> Builder
-
-lineSep :: Options -> String
-lineSep opt = lsep
-  where
-    LineSeparator lsep = lineSeparator opt
-
--- |
---
--- >>> toLisp defaultOptions "fo\"o" ""
--- "\"fo\\\"o\""
--- >>> toPlain defaultOptions "foo" ""
--- "foo"
-instance ToString String where
-    toLisp  opt = quote opt
-    toPlain opt = replace '\n' (lineSep opt)
-
--- |
---
--- >>> toLisp defaultOptions ["foo", "bar", "ba\"z"] ""
--- "(\"foo\" \"bar\" \"ba\\\"z\")"
--- >>> toPlain defaultOptions ["foo", "bar", "baz"] ""
--- "foo\nbar\nbaz"
-instance ToString [String] where
-    toLisp  opt = toSexp1 opt
-    toPlain opt = inter '\n' . map (toPlain opt)
-
--- |
---
--- >>> let inp = [((1,2,3,4),"foo"),((5,6,7,8),"bar")] :: [((Int,Int,Int,Int),String)]
--- >>> toLisp defaultOptions inp ""
--- "((1 2 3 4 \"foo\") (5 6 7 8 \"bar\"))"
--- >>> toPlain defaultOptions inp ""
--- "1 2 3 4 \"foo\"\n5 6 7 8 \"bar\""
-instance ToString [((Int,Int,Int,Int),String)] where
-    toLisp  opt = toSexp2 . map toS
-      where
-        toS x = ('(' :) . tupToString opt x . (')' :)
-    toPlain opt = inter '\n' . map (tupToString opt)
-
-toSexp1 :: Options -> [String] -> Builder
-toSexp1 opt ss = ('(' :) . inter ' ' (map (quote opt) ss) . (')' :)
-
-toSexp2 :: [Builder] -> Builder
-toSexp2 ss = ('(' :) . (inter ' ' ss) . (')' :)
-
-tupToString :: Options -> ((Int,Int,Int,Int),String) -> Builder
-tupToString opt ((a,b,c,d),s) = (show a ++) . (' ' :)
-                              . (show b ++) . (' ' :)
-                              . (show c ++) . (' ' :)
-                              . (show d ++) . (' ' :)
-                              . quote opt s -- fixme: quote is not necessary
-
-quote :: Options -> String -> Builder
-quote opt str = ("\"" ++) .  (quote' str ++) . ("\"" ++)
-  where
-    lsep = lineSep opt
-    quote' [] = []
-    quote' (x:xs)
-      | x == '\n' = lsep   ++ quote' xs
-      | x == '\\' = "\\\\" ++ quote' xs
-      | x == '"'  = "\\\"" ++ quote' xs
-      | otherwise = x       : quote' xs
-
-----------------------------------------------------------------
-
 -- | The environment where this library is used.
 data Cradle = Cradle {
   -- | The directory where this library is executed.
diff --git a/ghc-mod.cabal b/ghc-mod.cabal
index bfc2659..81ec2e9 100644
--- a/ghc-mod.cabal
+++ b/ghc-mod.cabal
@@ -61,6 +61,7 @@ Library
                         Language.Haskell.GhcMod.CabalConfig
                         Language.Haskell.GhcMod.Cabal16
                         Language.Haskell.GhcMod.Cabal18
+                        Language.Haskell.GhcMod.Convert
                         Language.Haskell.GhcMod.Check
                         Language.Haskell.GhcMod.Cradle
                         Language.Haskell.GhcMod.Debug