diff --git a/bench/Bench.hs b/bench/Bench.hs
new file mode 100644
index 0000000..62161fa
--- /dev/null
+++ b/bench/Bench.hs
@@ -0,0 +1,89 @@
+module Main (main) where
+import           Data.String.Conversions
+import           Data.String.Conversions.Monomorphic
+import           Criterion.Main
+import           Test.QuickCheck
+
+import qualified Data.ByteString.Lazy
+
+import qualified Data.Text.Encoding
+import qualified Data.Text.Encoding.Error
+import qualified Data.Text.Lazy
+
+
+main :: IO ()
+main = defaultMain
+  [ env genStrings $ \ ~(short, medium, large) ->
+      bgroup "conv"
+        [ bgroup "cs"
+            [ bgroup "short" $ benchConvertString short
+            , bgroup "medium" $ benchConvertString medium
+            , bgroup "large" $ benchConvertString large
+            ]
+        , bgroup "alt"
+            [ bgroup "short" $ benchAlt short
+            , bgroup "medium" $ benchAlt medium
+            , bgroup "large" $ benchAlt large
+            ]
+        ]
+  ]
+
+
+genStrings :: IO ([String], [String], [String])
+genStrings = do
+  short  <- generate (vectorOf 100 $ resize 30 $ listOf arbitraryUnicodeChar)
+  medium <- generate (vectorOf 100 $ resize 100 $ listOf arbitraryUnicodeChar)
+  large  <- generate (vectorOf 100 $ resize 8000 $ listOf arbitraryUnicodeChar)
+  return (short, medium, large)
+
+
+benchConvertString :: [String] -> [Benchmark]
+benchConvertString strings =
+  [ bench "StrictByteString-to-LazyByteString" $
+      nf (map toLazyByteString) (map toStrictByteString strings)
+  , bench "StrictByteString-to-StrictText" $
+      nf (map toStrictText) (map toStrictByteString strings)
+  , bench "StrictByteString-to-LazyText" $
+      nf (map toLazyText) (map toStrictByteString strings)
+  , bench "LazyByteString-to-StrictByteString" $
+      nf (map toStrictByteString) (map toLazyByteString strings)
+  , bench "LazyByteString-to-StrictText" $
+      nf (map toStrictText) (map toLazyByteString strings)
+  , bench "LazyByteString-to-LazyText" $
+      nf (map toLazyText) (map toLazyByteString strings)
+  , bench "StrictText-to-StrictByteString" $
+      nf (map toStrictByteString) (map toStrictText strings)
+  , bench "StrictText-to-LazyByteString" $
+      nf (map toLazyByteString) (map toStrictText strings)
+  , bench "StrictText-to-LazyText" $
+      nf (map toLazyText) (map toStrictText strings)
+  , bench "LazyText-to-StrictByteString" $
+      nf (map toStrictByteString) (map toLazyText strings)
+  , bench "LazyText-to-LazyByteString" $
+      nf (map toLazyByteString) (map toLazyText strings)
+  , bench "LazyText-to-StrictText" $
+      nf (map toStrictText) (map toLazyText strings)
+  ]
+
+
+benchAlt :: [String] -> [Benchmark]
+benchAlt strings =
+  [ bench "StrictByteString-to-LazyText" $
+      nf (map altSBStoLT) (map toSBS strings)
+
+  , bench "LazyByteString-to-LazyText" $
+      nf (map altLBStoLT) (map toLBS strings)
+  ]
+
+
+altSBStoLT :: StrictByteString -> LazyText
+altSBStoLT =
+  Data.Text.Lazy.fromChunks . pure .
+  Data.Text.Encoding.decodeUtf8With Data.Text.Encoding.Error.lenientDecode
+
+
+altLBStoLT :: LazyByteString -> LazyText
+altLBStoLT =
+  Data.Text.Lazy.fromChunks .
+  map (Data.Text.Encoding.decodeUtf8With Data.Text.Encoding.Error.lenientDecode) .
+  Data.ByteString.Lazy.toChunks
diff --git a/package.yaml b/package.yaml
index 5ba7550..2c1ef0d 100644
--- a/package.yaml
+++ b/package.yaml
@@ -39,3 +39,14 @@ tests:
       - quickcheck-instances
       - deepseq
       - QuickCheck
+
+
+benchmarks:
+  bench:
+    main: Bench.hs
+    source-dirs:
+      - bench
+    dependencies:
+      - criterion
+      - string-conversions
+      - QuickCheck
diff --git a/string-conversions.cabal b/string-conversions.cabal
index e546788..0dd4430 100644
--- a/string-conversions.cabal
+++ b/string-conversions.cabal
@@ -1,4 +1,6 @@
--- This file has been generated from package.yaml by hpack version 0.15.0.
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.34.6.
 --
 -- see: https://github.com/sol/hpack
 
@@ -8,14 +10,14 @@ synopsis:            Simplifies dealing with different types for strings
 description:         Provides a simple type class for converting values of different string types into values of other string types.
 license:             BSD3
 license-file:        LICENSE
-tested-with:         GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.1, GHC == 8.0.1
+tested-with:
+  GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.1, GHC == 8.0.1
 author:              Sönke Hahn
 maintainer:          soenkehahn@gmail.com
 category:            Data
 homepage:            https://github.com/soenkehahn/string-conversions#readme
 bug-reports:         https://github.com/soenkehahn/string-conversions/issues
 build-type:          Simple
-cabal-version:       >= 1.10
 
 source-repository head
   type: git
@@ -24,34 +26,54 @@ source-repository head
 library
   hs-source-dirs:
     src
+  ghc-options: -Wall
   default-language: Haskell2010
   build-depends:
-    base == 4.*,
-    bytestring >= 0.9,
-    text >= 0.11,
-    utf8-string >= 0.3
+    base ==4.*,
+    bytestring >=0.9,
+    text >=0.11,
+    utf8-string >=0.3
   exposed-modules:
     Data.String.Conversions
     Data.String.Conversions.Monomorphic
-  ghc-options: -Wall
+  other-modules:
+    Paths_string_conversions
 
 test-suite spec
   type: exitcode-stdio-1.0
   main-is: Spec.hs
   hs-source-dirs:
-    test,
+    test
     src
   build-depends:
-    base == 4.*,
-    bytestring >= 0.9,
-    text >= 0.11,
-    utf8-string >= 0.3,
+    QuickCheck,
+    base ==4.*,
+    bytestring >=0.9,
+    deepseq,
     hspec,
     quickcheck-instances,
-    deepseq,
-    QuickCheck
+    text >=0.11,
+    utf8-string >=0.3
   other-modules:
     Data.String.ConversionsSpec
     Data.String.Conversions
     Data.String.Conversions.Monomorphic
+    Paths_string_conversions
+  default-language: Haskell2010
+
+benchmark bench
+  type: exitcode-stdio-1.0
+  main-is: Bench.hs
+  other-modules:
+    Paths_string_conversions
+  hs-source-dirs:
+    bench
+  build-depends:
+    QuickCheck,
+    base ==4.*,
+    bytestring >=0.9,
+    criterion,
+    string-conversions,
+    text >=0.11,
+    utf8-string >=0.3
   default-language: Haskell2010