diff --git a/minio-hs.cabal b/minio-hs.cabal
index 2157dfd..6232906 100644
--- a/minio-hs.cabal
+++ b/minio-hs.cabal
@@ -26,6 +26,7 @@ library
                      , Network.Minio.Data.ByteString
                      , Network.Minio.Data.Crypto
                      , Network.Minio.Data.Time
+                     , Network.Minio.Errors
                      , Network.Minio.ListOps
                      , Network.Minio.PutObject
                      , Network.Minio.Sign.V4
@@ -55,6 +56,7 @@ library
                      , monad-control
                      , resourcet
                      , text
+                     , text-format
                      , time
                      , transformers
                      , transformers-base
@@ -98,6 +100,7 @@ test-suite minio-hs-live-server-test
                      , Network.Minio.Data.ByteString
                      , Network.Minio.Data.Crypto
                      , Network.Minio.Data.Time
+                     , Network.Minio.Errors
                      , Network.Minio.ListOps
                      , Network.Minio.PutObject
                      , Network.Minio.S3API
@@ -138,6 +141,7 @@ test-suite minio-hs-live-server-test
                      , tasty-smallcheck
                      , temporary
                      , text
+                     , text-format
                      , time
                      , transformers
                      , transformers-base
@@ -180,6 +184,7 @@ test-suite minio-hs-test
                      , tasty-smallcheck
                      , temporary
                      , text
+                     , text-format
                      , time
                      , transformers
                      , transformers-base
@@ -204,6 +209,7 @@ test-suite minio-hs-test
                      , Network.Minio.Data.ByteString
                      , Network.Minio.Data.Crypto
                      , Network.Minio.Data.Time
+                     , Network.Minio.Errors
                      , Network.Minio.ListOps
                      , Network.Minio.PutObject
                      , Network.Minio.S3API
diff --git a/src/Lib/Prelude.hs b/src/Lib/Prelude.hs
index 8034753..8d665cb 100644
--- a/src/Lib/Prelude.hs
+++ b/src/Lib/Prelude.hs
@@ -6,11 +6,28 @@ https://github.com/sdiehl/protolude/blob/master/Symbols.md
 -}
 module Lib.Prelude
     ( module Exports
+    , both
+
+    , format
     ) where
 
-import Protolude as Exports
+import           Protolude as Exports
 
-import Data.Time as Exports (UTCTime)
-import Control.Monad.Trans.Maybe as Exports (runMaybeT, MaybeT(..))
+import           Data.Time as Exports (UTCTime(..), diffUTCTime)
+import           Control.Monad.Trans.Maybe as Exports (runMaybeT, MaybeT(..))
 
-import Control.Monad.Catch as Exports (throwM, MonadThrow, MonadCatch)
+import           Control.Monad.Catch as Exports (throwM, MonadThrow, MonadCatch)
+
+import           Data.Text.Format as Exports (Shown(..))
+import qualified Data.Text.Format as TF
+import           Data.Text.Format.Params (Params)
+import qualified Data.Text.Lazy as LT
+
+format :: Params ps => TF.Format -> ps -> Text
+format f args = LT.toStrict $ TF.format f args
+
+-- import Data.Tuple as Exports (uncurry)
+
+-- | Apply a function on both elements of a pair
+both :: (a -> b) -> (a, a) -> (b, b)
+both f (a, b) = (f a, f b)
diff --git a/src/Network/Minio.hs b/src/Network/Minio.hs
index aad9fea..0bf3bdc 100644
--- a/src/Network/Minio.hs
+++ b/src/Network/Minio.hs
@@ -44,6 +44,7 @@ module Network.Minio
   , fGetObject
   , fPutObject
   , putObject
+  , copyObject
 
   , getObject
   , statObject
@@ -61,6 +62,7 @@ import qualified Data.Conduit.Binary as CB
 import           Lib.Prelude
 
 import           Network.Minio.Data
+import           Network.Minio.Errors
 import           Network.Minio.ListOps
 import           Network.Minio.PutObject
 import           Network.Minio.S3API
@@ -79,14 +81,20 @@ fPutObject bucket object f = void $ putObjectInternal bucket object $
                              ODFile f Nothing
 
 -- | Put an object from a conduit source. The size can be provided if
--- known; this helps the library select optimal part sizes to
--- performing a multipart upload. If not specified, it is assumed that
--- the object can be potentially 5TiB and selects multipart sizes
--- appropriately.
+-- known; this helps the library select optimal part sizes to perform
+-- a multipart upload. If not specified, it is assumed that the object
+-- can be potentially 5TiB and selects multipart sizes appropriately.
 putObject :: Bucket -> Object -> C.Producer Minio ByteString
-                    -> Maybe Int64 -> Minio ()
-putObject bucket object src sizeMay = void $ putObjectInternal bucket object $
-                                                ODStream src sizeMay
+          -> Maybe Int64 -> Minio ()
+putObject bucket object src sizeMay =
+  void $ putObjectInternal bucket object $ ODStream src sizeMay
+
+-- | Perform a server-side copy operation to create an object with the
+-- given bucket and object name from the source specification in
+-- CopyPartSource. This function performs a multipart copy operation
+-- if the new object is to be greater than 5GiB in size.
+copyObject :: Bucket -> Object -> CopyPartSource -> Minio ()
+copyObject bucket object cps = void $ copyObjectInternal bucket object cps
 
 -- | Get an object from the object store as a resumable source (conduit).
 getObject :: Bucket -> Object -> Minio (C.ResumableSource Minio ByteString)
diff --git a/src/Network/Minio/Data.hs b/src/Network/Minio/Data.hs
index 1180cdb..31c33d9 100644
--- a/src/Network/Minio/Data.hs
+++ b/src/Network/Minio/Data.hs
@@ -7,7 +7,8 @@ import           Control.Monad.Trans.Control
 import           Control.Monad.Trans.Resource
 import qualified Data.ByteString as B
 import           Data.Default (Default(..))
-import           Network.HTTP.Client (defaultManagerSettings, HttpException)
+import qualified Data.Text as T
+import           Network.HTTP.Client (defaultManagerSettings)
 import qualified Network.HTTP.Conduit as NC
 import           Network.HTTP.Types (Method, Header, Query)
 import qualified Network.HTTP.Types as HT
@@ -15,6 +16,9 @@ import           Text.XML
 
 import           Lib.Prelude
 
+import           Network.Minio.Errors
+import           Network.Minio.Utils
+
 -- | Connection Info data type. Use the Default instance to create
 -- connection info for your service.
 data ConnectInfo = ConnectInfo {
@@ -140,6 +144,47 @@ data ObjectInfo = ObjectInfo {
   , oiSize :: Int64
   } deriving (Show, Eq)
 
+data CopyPartSource = CopyPartSource {
+    cpSource :: Text -- | formatted like "/sourceBucket/sourceObject"
+  , cpSourceRange :: Maybe (Int64, Int64) -- | (0, 9) means first ten
+                                          -- bytes of the source
+                                          -- object
+  , cpSourceIfMatch :: Maybe Text
+  , cpSourceIfNoneMatch :: Maybe Text
+  , cpSourceIfUnmodifiedSince :: Maybe UTCTime
+  , cpSourceIfModifiedSince :: Maybe UTCTime
+  } deriving (Show, Eq)
+
+instance Default CopyPartSource where
+  def = CopyPartSource "" def def def def def
+
+cpsToHeaders :: CopyPartSource -> [HT.Header]
+cpsToHeaders cps = ("x-amz-copy-source", encodeUtf8 $ cpSource cps) :
+                   (rangeHdr ++ (zip names values))
+  where
+    names = ["x-amz-copy-source-if-match", "x-amz-copy-source-if-none-match",
+             "x-amz-copy-source-if-unmodified-since",
+             "x-amz-copy-source-if-modified-since"]
+    values = concatMap (maybeToList . fmap encodeUtf8 . (cps &))
+             [cpSourceIfMatch, cpSourceIfNoneMatch,
+              fmap formatRFC1123 . cpSourceIfUnmodifiedSince,
+              fmap formatRFC1123 . cpSourceIfModifiedSince]
+    rangeHdr = ("x-amz-copy-source-range",)
+             . HT.renderByteRanges
+             . (:[])
+             . uncurry HT.ByteRangeFromTo
+           <$> (map (both fromIntegral) $
+                maybeToList $ cpSourceRange cps)
+
+-- | Extract the source bucket and source object name. TODO: validate
+-- the bucket and object name extracted.
+cpsToObject :: CopyPartSource -> Maybe (Bucket, Object)
+cpsToObject cps = do
+  [_, bucket, object] <- Just splits
+  return (bucket, object)
+  where
+    splits = T.splitOn "/" $ cpSource cps
+
 -- | Represents different kinds of payload that are used with S3 API
 -- requests.
 data Payload = PayloadBS ByteString
@@ -222,29 +267,3 @@ runMinio ci m = do
 
 s3Name :: Text -> Name
 s3Name s = Name s (Just "http://s3.amazonaws.com/doc/2006-03-01/") Nothing
-
----------------------------------
--- Errors
----------------------------------
--- | Various validation errors
-data MErrV = MErrVSinglePUTSizeExceeded Int64
-           | MErrVPutSizeExceeded Int64
-           | MErrVETagHeaderNotFound
-           | MErrVInvalidObjectInfoResponse
-  deriving (Show, Eq)
-
--- | Errors thrown by the library
-data MinioErr = ME MError
-              | MEHttp HttpException
-              | MEFile IOException
-  deriving (Show)
-
-instance Exception MinioErr
-
--- | Library internal errors
-data MError = XMLParseError Text
-            | ResponseError (NC.Response LByteString)
-            | ValidationError MErrV
-  deriving (Show, Eq)
-
-instance Exception MError
diff --git a/src/Network/Minio/Errors.hs b/src/Network/Minio/Errors.hs
new file mode 100644
index 0000000..95e9fd8
--- /dev/null
+++ b/src/Network/Minio/Errors.hs
@@ -0,0 +1,36 @@
+module Network.Minio.Errors where
+
+import           Control.Exception
+import qualified Network.HTTP.Conduit as NC
+
+import           Lib.Prelude
+
+
+---------------------------------
+-- Errors
+---------------------------------
+-- | Various validation errors
+data MErrV = MErrVSinglePUTSizeExceeded Int64
+           | MErrVPutSizeExceeded Int64
+           | MErrVETagHeaderNotFound
+           | MErrVInvalidObjectInfoResponse
+           | MErrVInvalidSrcObjSpec Text
+           | MErrVInvalidSrcObjByteRange (Int64, Int64)
+           | MErrVCopyObjSingleNoRangeAccepted
+  deriving (Show, Eq)
+
+-- | Errors thrown by the library
+data MinioErr = ME MError
+              | MEHttp NC.HttpException
+              | MEFile IOException
+  deriving (Show)
+
+instance Exception MinioErr
+
+-- | Library internal errors
+data MError = XMLParseError Text
+            | ResponseError (NC.Response LByteString)
+            | ValidationError MErrV
+  deriving (Show, Eq)
+
+instance Exception MError
diff --git a/src/Network/Minio/PutObject.hs b/src/Network/Minio/PutObject.hs
index 33d2c71..9751307 100644
--- a/src/Network/Minio/PutObject.hs
+++ b/src/Network/Minio/PutObject.hs
@@ -3,6 +3,9 @@ module Network.Minio.PutObject
     putObjectInternal
   , ObjectData(..)
   , selectPartSizes
+  , copyObjectInternal
+  , selectCopyRanges
+  , minPartSize
   ) where
 
 
@@ -19,6 +22,7 @@ import           Lib.Prelude
 
 import           Network.Minio.Data
 import           Network.Minio.Data.Crypto
+import           Network.Minio.Errors
 import           Network.Minio.ListOps
 import           Network.Minio.S3API
 import           Network.Minio.Utils
@@ -28,6 +32,14 @@ import           Network.Minio.Utils
 maxObjectSize :: Int64
 maxObjectSize = 5 * 1024 * 1024 * oneMiB
 
+-- | minimum size of parts used in multipart operations.
+minPartSize :: Int64
+minPartSize = 64 * oneMiB
+
+-- | max part of an object size is 5GiB
+maxObjectPartSize :: Int64
+maxObjectPartSize = 5 * 1024 * oneMiB
+
 oneMiB :: Int64
 oneMiB = 1024 * 1024
 
@@ -44,8 +56,9 @@ maxMultipartParts = 10000
 -- For streams also, a size may be provided. This is useful to limit
 -- the input - if it is not provided, upload will continue until the
 -- stream ends or the object reaches `maxObjectsize` size.
-data ObjectData m = ODFile FilePath (Maybe Int64) -- ^ Takes filepath and optional size.
-                  | ODStream (C.Producer m ByteString) (Maybe Int64) -- ^ Pass size in bytes as maybe if known.
+data ObjectData m =
+  ODFile FilePath (Maybe Int64) -- ^ Takes filepath and optional size.
+  | ODStream (C.Producer m ByteString) (Maybe Int64) -- ^ Pass size in bytes as maybe if known.
 
 -- | Put an object from ObjectData. This high-level API handles
 -- objects of all sizes, and even if the object size is unknown.
@@ -77,18 +90,21 @@ putObjectInternal b o (ODFile fp sizeMay) = do
                         CB.sourceFile fp
 
 -- | Select part sizes - the logic is that the minimum part-size will
--- be 64MiB. TODO: write quickcheck tests.
+-- be 64MiB.
 selectPartSizes :: Int64 -> [(PartNumber, Int64, Int64)]
-selectPartSizes size = List.zip3 [1..] partOffsets partSizes
+selectPartSizes size = uncurry (List.zip3 [1..]) $
+                       List.unzip $ loop 0 size
   where
     ceil :: Double -> Int64
     ceil = ceiling
-    partSize = max (64 * oneMiB) (ceil $ fromIntegral size /
-                                  fromIntegral maxMultipartParts)
-    (numParts, lastPartSize) = size `divMod` partSize
-    lastPart = filter (> 0) [lastPartSize]
-    partSizes = replicate (fromIntegral numParts) partSize ++ lastPart
-    partOffsets = List.scanl' (+) 0 partSizes
+    partSize = max minPartSize (ceil $ fromIntegral size /
+                               fromIntegral maxMultipartParts)
+
+    m = fromIntegral partSize
+    loop st sz
+      | st > sz = []
+      | st + m >= sz = [(st, sz - st)]
+      | otherwise = (st, m) : loop (st + m) sz
 
 -- returns partinfo if part is already uploaded.
 checkUploadNeeded :: Payload -> PartNumber
@@ -178,3 +194,68 @@ getExistingUpload b o = do
   parts <- maybe (return [])
     (\uid -> listIncompleteParts b o uid C.$$ CC.sinkList) uidMay
   return (uidMay, Map.fromList $ map (\p -> (piNumber p, p)) parts)
+
+-- | Copy an object using single or multipart copy strategy.
+copyObjectInternal :: Bucket -> Object -> CopyPartSource
+                   -> Minio ETag
+copyObjectInternal b' o cps = do
+  -- validate and extract the src bucket and object
+  (srcBucket, srcObject) <- maybe
+    (throwM $ ValidationError $ MErrVInvalidSrcObjSpec $ cpSource cps)
+    return $ cpsToObject cps
+
+  -- get source object size with a head request
+  (ObjectInfo _ _ _ srcSize) <- headObject srcBucket srcObject
+
+  -- check that byte offsets are valid if specified in cps
+  when (isJust (cpSourceRange cps) &&
+        or [fst range < 0, snd range < fst range,
+            snd range >= fromIntegral srcSize]) $
+    throwM $ ValidationError $ MErrVInvalidSrcObjByteRange range
+
+  -- 1. If sz > 5gb use multipart copy
+  -- 2. If startOffset /= 0 use multipart copy
+  let destSize = (\(a, b) -> b - a + 1 ) $
+                 maybe (0, srcSize - 1) identity $ cpSourceRange cps
+      startOffset = maybe 0 fst $ cpSourceRange cps
+      endOffset = maybe (srcSize - 1) snd $ cpSourceRange cps
+
+  if destSize > maxObjectPartSize || (endOffset - startOffset + 1 /= srcSize)
+    then multiPartCopyObject b' o cps srcSize
+    else fst <$> copyObjectSingle b' o cps{cpSourceRange = Nothing} []
+
+  where
+    range = maybe (0, 0) identity $ cpSourceRange cps
+
+-- | Given the input byte range of the source object, compute the
+-- splits for a multipart copy object procedure. Minimum part size
+-- used is minPartSize.
+selectCopyRanges :: (Int64, Int64) -> [(PartNumber, (Int64, Int64))]
+selectCopyRanges (st, end) = zip pns $
+  map (\(x, y) -> (st + x, st + x + y - 1)) $ zip startOffsets partSizes
+  where
+    size = end - st + 1
+    (pns, startOffsets, partSizes) = List.unzip3 $ selectPartSizes size
+
+-- | Perform a multipart copy object action. Since we cannot verify
+-- existing parts based on the source object, there is no resuming
+-- copy action support.
+multiPartCopyObject :: Bucket -> Object -> CopyPartSource -> Int64
+                    -> Minio ETag
+multiPartCopyObject b o cps srcSize = do
+  uid <- newMultipartUpload b o []
+
+  let byteRange = maybe (0, fromIntegral $ srcSize - 1) identity $
+                  cpSourceRange cps
+      partRanges = selectCopyRanges byteRange
+      partSources = map (\(x, y) -> (x, cps {cpSourceRange = Just y}))
+                    partRanges
+
+  copiedParts <- limitedMapConcurrently 10
+                 (\(pn, cps') -> do
+                     (etag, _) <- copyObjectPart b o cps' uid pn []
+                     return $ PartInfo pn etag
+                 )
+                 partSources
+
+  completeMultipartUpload b o uid copiedParts
diff --git a/src/Network/Minio/S3API.hs b/src/Network/Minio/S3API.hs
index 6b747ca..dd9e576 100644
--- a/src/Network/Minio/S3API.hs
+++ b/src/Network/Minio/S3API.hs
@@ -22,6 +22,7 @@ module Network.Minio.S3API
   , putBucket
   , ETag
   , putObjectSingle
+  , copyObjectSingle
 
   -- * Multipart Upload APIs
   --------------------------
@@ -29,8 +30,10 @@ module Network.Minio.S3API
   , PartInfo
   , Payload(..)
   , PartNumber
+  , CopyPartSource(..)
   , newMultipartUpload
   , putObjectPart
+  , copyObjectPart
   , completeMultipartUpload
   , abortMultipartUpload
   , ListUploadsResult
@@ -52,11 +55,12 @@ import qualified Network.HTTP.Types as HT
 
 import           Lib.Prelude
 
-import           Network.Minio.Data
 import           Network.Minio.API
+import           Network.Minio.Data
+import           Network.Minio.Errors
 import           Network.Minio.Utils
-import           Network.Minio.XmlParser
 import           Network.Minio.XmlGenerator
+import           Network.Minio.XmlParser
 
 
 -- | Fetch all buckets from the service.
@@ -193,6 +197,43 @@ putObjectPart bucket object uploadId partNumber headers payload = do
       , ("partNumber", Just $ show partNumber)
       ]
 
+-- | Performs server-side copy of an object or part of an object as an
+-- upload part of an ongoing multi-part upload.
+copyObjectPart :: Bucket -> Object -> CopyPartSource -> UploadId
+               -> PartNumber -> [HT.Header] -> Minio (ETag, UTCTime)
+copyObjectPart bucket object cps uploadId partNumber headers = do
+  resp <- executeRequest $
+          def { riMethod = HT.methodPut
+              , riBucket = Just bucket
+              , riObject = Just object
+              , riQueryParams = mkOptionalParams params
+              , riHeaders = headers ++ cpsToHeaders cps
+              }
+
+  parseCopyObjectResponse $ NC.responseBody resp
+  where
+    params = [
+        ("uploadId", Just uploadId)
+      , ("partNumber", Just $ show partNumber)
+      ]
+
+-- | Performs server-side copy of an object that is upto 5GiB in
+-- size. If the object is greater than 5GiB, this function throws the
+-- error returned by the server.
+copyObjectSingle :: Bucket -> Object -> CopyPartSource -> [HT.Header]
+                 -> Minio (ETag, UTCTime)
+copyObjectSingle bucket object cps headers = do
+  -- validate that cpSourceRange is Nothing for this API.
+  when (isJust $ cpSourceRange cps) $
+    throwM $ ValidationError $ MErrVCopyObjSingleNoRangeAccepted
+  resp <- executeRequest $
+          def { riMethod = HT.methodPut
+              , riBucket = Just bucket
+              , riObject = Just object
+              , riHeaders = headers ++ cpsToHeaders cps
+              }
+  parseCopyObjectResponse $ NC.responseBody resp
+
 -- | Complete a multipart upload.
 completeMultipartUpload :: Bucket -> Object -> UploadId -> [PartInfo]
                         -> Minio ETag
@@ -226,22 +267,22 @@ listIncompleteUploads' :: Bucket -> Maybe Text -> Maybe Text -> Maybe Text
 listIncompleteUploads' bucket prefix delimiter keyMarker uploadIdMarker = do
   resp <- executeRequest $ def { riMethod = HT.methodGet
                                , riBucket = Just bucket
-                               , riQueryParams = ("uploads", Nothing): mkOptionalParams params
+                               , riQueryParams = params
                                }
   parseListUploadsResponse $ NC.responseBody resp
   where
-    -- build optional query params
-    params = [
-        ("prefix", prefix)
-      , ("delimiter", delimiter)
-      , ("key-marker", keyMarker)
-      , ("upload-id-marker", uploadIdMarker)
-      ]
+    -- build query params
+    params = ("uploads", Nothing) : mkOptionalParams
+             [ ("prefix", prefix)
+             , ("delimiter", delimiter)
+             , ("key-marker", keyMarker)
+             , ("upload-id-marker", uploadIdMarker)
+             ]
 
 
 -- | List parts of an ongoing multipart upload.
 listIncompleteParts' :: Bucket -> Object -> UploadId -> Maybe Text
-                      -> Maybe Text -> Minio ListPartsResult
+                     -> Maybe Text -> Minio ListPartsResult
 listIncompleteParts' bucket object uploadId maxParts partNumMarker = do
   resp <- executeRequest $ def { riMethod = HT.methodGet
                                , riBucket = Just bucket
diff --git a/src/Network/Minio/Utils.hs b/src/Network/Minio/Utils.hs
index 0ab0fba..ef95385 100644
--- a/src/Network/Minio/Utils.hs
+++ b/src/Network/Minio/Utils.hs
@@ -22,12 +22,16 @@ import qualified System.IO as IO
 
 import           Lib.Prelude
 
-import           Network.Minio.Data
+import           Network.Minio.Errors
 
 -- | Represent the time format string returned by S3 API calls.
 s3TimeFormat :: [Char]
 s3TimeFormat = iso8601DateFormat $ Just "%T%QZ"
 
+-- | Format as per RFC 1123.
+formatRFC1123 :: UTCTime -> T.Text
+formatRFC1123 = T.pack . formatTime defaultTimeLocale "%a, %d %b %Y %X %Z"
+
 allocateReadFile :: (R.MonadResource m, R.MonadResourceBase m)
                  => FilePath -> m (R.ReleaseKey, Handle)
 allocateReadFile fp = do
diff --git a/src/Network/Minio/XmlParser.hs b/src/Network/Minio/XmlParser.hs
index 6041279..ec698b3 100644
--- a/src/Network/Minio/XmlParser.hs
+++ b/src/Network/Minio/XmlParser.hs
@@ -3,6 +3,7 @@ module Network.Minio.XmlParser
   , parseLocation
   , parseNewMultipartUpload
   , parseCompleteMultipartUploadResponse
+  , parseCopyObjectResponse
   , parseListObjectsResponse
   , parseListUploadsResponse
   , parseListPartsResponse
@@ -19,6 +20,7 @@ import           Text.XML.Cursor
 import           Lib.Prelude
 
 import           Network.Minio.Data
+import           Network.Minio.Errors
 import           Network.Minio.Utils (s3TimeFormat)
 
 
@@ -79,6 +81,16 @@ parseCompleteMultipartUploadResponse xmldata = do
   r <- parseRoot xmldata
   return $ T.concat $ r $// s3Elem "ETag" &/ content
 
+-- | Parse the response XML of copyObject and copyObjectPart
+parseCopyObjectResponse :: (MonadThrow m) => LByteString -> m (ETag, UTCTime)
+parseCopyObjectResponse xmldata = do
+  r <- parseRoot xmldata
+  let
+    mtimeStr = T.concat $ r $// s3Elem "LastModified" &/ content
+
+  mtime <- parseS3XMLTime mtimeStr
+  return $ (T.concat $ r $// s3Elem "ETag" &/ content, mtime)
+
 -- | Parse the response XML of a list objects call.
 parseListObjectsResponse :: (MonadThrow m)
                          => LByteString -> m ListObjectsResult
diff --git a/test/LiveServer.hs b/test/LiveServer.hs
index b3d9386..380872c 100644
--- a/test/LiveServer.hs
+++ b/test/LiveServer.hs
@@ -290,4 +290,104 @@ liveServerUnitTests = testGroup "Unit tests against a live server"
 
       step "delete object"
       deleteObject bucket object
+
+  , funTestWithBucket "copyObjectSingle basic tests" $ \step bucket -> do
+      let object = "xxx"
+          objCopy = "xxxCopy"
+          size1 = 100 :: Int64
+
+      step "create server object to copy"
+      inputFile <- mkRandFile size1
+      fPutObject bucket object inputFile
+
+      step "copy object"
+      let cps = def { cpSource = format "/{}/{}" [bucket, object] }
+      (etag, modTime) <- copyObjectSingle bucket objCopy cps []
+
+      -- retrieve obj info to check
+      ObjectInfo _ t e s <- headObject bucket objCopy
+
+      let isMTimeDiffOk = abs (diffUTCTime modTime t) < 1.0
+
+      liftIO $ (s == size1 && e == etag && isMTimeDiffOk) @?
+        "Copied object did not match expected."
+
+      step "cleanup actions"
+      deleteObject bucket object
+      deleteObject bucket objCopy
+
+  , funTestWithBucket "copyObjectPart basic tests" $ \step bucket -> do
+      let srcObj = "XXX"
+          copyObj = "XXXCopy"
+
+      step "Prepare"
+      let mb15 = 15 * 1024 * 1024
+          mb5 = 5 * 1024 * 1024
+      randFile <- mkRandFile mb15
+      fPutObject bucket srcObj randFile
+
+      step "create new multipart upload"
+      uid <- newMultipartUpload bucket copyObj []
+      liftIO $ (T.length uid > 0) @? ("Got an empty multipartUpload Id.")
+
+      step "put object parts 1-3"
+      let cps = def {cpSource = format "/{}/{}" [bucket, srcObj]}
+      parts <- forM [1..3] $ \p -> do
+        (etag, _) <- copyObjectPart bucket copyObj cps{
+          cpSourceRange = Just ((p-1)*mb5, (p-1)*mb5 + (mb5 - 1))
+          } uid (fromIntegral p) []
+        return $ PartInfo (fromIntegral p) etag
+
+      step "complete multipart"
+      void $ completeMultipartUpload bucket copyObj uid parts
+
+      step "verify copied object size"
+      (ObjectInfo _ _ _ s) <- headObject bucket copyObj
+
+      liftIO $ (s == mb15) @? "Size failed to match"
+
+      step $ "Cleanup actions"
+      deleteObject bucket srcObj
+      deleteObject bucket copyObj
+
+  , funTestWithBucket "copyObject basic tests" $ \step bucket -> do
+      let srcs = ["XXX", "XXXL"]
+          copyObjs = ["XXXCopy", "XXXLCopy"]
+          sizes = map (* (1024 * 1024)) [15, 65]
+
+      step "Prepare"
+      forM_ (zip srcs sizes) $ \(src, size) ->
+        fPutObject bucket src =<< mkRandFile size
+
+      step "make small and large object copy"
+      forM_ (zip copyObjs srcs) $ \(cp, src) ->
+        copyObject bucket cp def{cpSource = format "/{}/{}" [bucket, src]}
+
+      step "verify uploaded objects"
+      uploadedSizes <- fmap (fmap oiSize) $ forM copyObjs (headObject bucket)
+
+      liftIO $ (sizes == uploadedSizes) @? "Uploaded obj sizes failed to match"
+
+      forM_ (concat [srcs, copyObjs]) (deleteObject bucket)
+
+  , funTestWithBucket "copyObject with offset test " $ \step bucket -> do
+      let src = "XXX"
+          copyObj = "XXXCopy"
+          size = 15 * 1024 * 1024
+
+      step "Prepare"
+      fPutObject bucket src =<< mkRandFile size
+
+      step "copy last 10MiB of object"
+      copyObject bucket copyObj def{
+          cpSource = format "/{}/{}" [bucket, src]
+        , cpSourceRange = Just (5 * 1024 * 1024, size - 1)
+        }
+
+      step "verify uploaded object"
+      cSize <- oiSize <$> headObject bucket copyObj
+
+      liftIO $ (cSize == 10 * 1024 * 1024) @? "Uploaded obj size mismatched!"
+
+      forM_ [src, copyObj] (deleteObject bucket)
   ]
diff --git a/test/Network/Minio/XmlParser/Test.hs b/test/Network/Minio/XmlParser/Test.hs
index b1058f3..a29e918 100644
--- a/test/Network/Minio/XmlParser/Test.hs
+++ b/test/Network/Minio/XmlParser/Test.hs
@@ -4,13 +4,14 @@ module Network.Minio.XmlParser.Test
   ) where
 
 import qualified Control.Monad.Catch as MC
-import           Data.Time (fromGregorian, UTCTime(..))
+import           Data.Time (fromGregorian)
 import           Test.Tasty
 import           Test.Tasty.HUnit
 
 import           Lib.Prelude
 
 import           Network.Minio.Data
+import           Network.Minio.Errors
 import           Network.Minio.XmlParser
 
 xmlParserTests :: TestTree
@@ -21,6 +22,7 @@ xmlParserTests = testGroup "XML Parser Tests"
   , testCase "Test parseListUploadsresponse" testParseListIncompleteUploads
   , testCase "Test parseCompleteMultipartUploadResponse" testParseCompleteMultipartUploadResponse
   , testCase "Test parseListPartsResponse" testParseListPartsResponse
+  , testCase "Test parseCopyObjectResponse" testParseCopyObjectResponse
   ]
 
 tryMError :: (MC.MonadCatch m) => m a -> m (Either MError a)
@@ -210,3 +212,25 @@ testParseListPartsResponse = do
 
   parsedListPartsResult <- runExceptT $ parseListPartsResponse xmldata
   eitherMError parsedListPartsResult (@?= expectedListResult)
+
+testParseCopyObjectResponse :: Assertion
+testParseCopyObjectResponse = do
+  let
+    cases = [ ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\
+\<CopyObjectResult xmlns=\"http://s3.amazonaws.com/doc/2006-03-01/\">\
+   \<LastModified>2009-10-28T22:32:00.000Z</LastModified>\
+   \<ETag>\"9b2cf535f27731c974343645a3985328\"</ETag>\
+\</CopyObjectResult>",
+              ("\"9b2cf535f27731c974343645a3985328\"",
+               UTCTime (fromGregorian 2009 10 28) 81120))
+            , ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\
+\<CopyPartResult xmlns=\"http://s3.amazonaws.com/doc/2006-03-01/\">\
+   \<LastModified>2009-10-28T22:32:00.000Z</LastModified>\
+   \<ETag>\"9b2cf535f27731c974343645a3985328\"</ETag>\
+\</CopyPartResult>",
+              ("\"9b2cf535f27731c974343645a3985328\"",
+              UTCTime (fromGregorian 2009 10 28) 81120))]
+
+  forM_ cases $ \(xmldata, (etag, modTime)) -> do
+    parseResult <- runExceptT $ parseCopyObjectResponse xmldata
+    eitherMError parseResult (@?= (etag, modTime))
diff --git a/test/Spec.hs b/test/Spec.hs
index b98d387..fe9cff5 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -31,7 +31,7 @@ properties = testGroup "Properties" [qcProps] -- [scProps]
 
 qcProps :: TestTree
 qcProps = testGroup "(checked by QuickCheck)"
-  [ QC.testProperty "selectPartSizes: simple properties" $
+  [ QC.testProperty "selectPartSizes:" $
     \n -> let (pns, offs, sizes) = L.unzip3 (selectPartSizes n)
 
               -- check that pns increments from 1.
@@ -45,22 +45,52 @@ qcProps = testGroup "(checked by QuickCheck)"
               isOffsetsAsc = all (\(a, b) -> a < b) $ consPairs offs
 
               -- check sizes sums to n.
-              isSumSizeOk = n < 0 || (sum sizes == n && all (> 0) sizes)
+              isSumSizeOk = sum sizes == n
 
               -- check sizes are constant except last
               isSizesConstantExceptLast =
-                n <= 0 || all (\(a, b) -> a == b) (consPairs $ L.init sizes)
+                all (\(a, b) -> a == b) (consPairs $ L.init sizes)
 
-          in isPNumsAscendingFrom1 && isOffsetsAsc && isSumSizeOk &&
-             isSizesConstantExceptLast
+              -- check each part except last is at least minPartSize;
+              -- last part may be 0 only if it is the only part.
+              nparts = length sizes
+              isMinPartSizeOk =
+                if | nparts > 1 -> -- last part can be smaller but > 0
+                     all (>= minPartSize) (take (nparts - 1) sizes) &&
+                     all (\s -> s > 0) (drop (nparts - 1) sizes)
+                   | nparts == 1 -> -- size may be 0 here.
+                       maybe True (\x -> x >= 0 && x <= minPartSize) $
+                       headMay sizes
+                   | otherwise -> False
 
-  , QC.testProperty "selectPartSizes: part-size is at least 64MiB" $
-    \n -> let (_, _, sizes) = L.unzip3 (selectPartSizes n)
-              mib64 = 64 * 1024 * 1024
-          in if | length sizes > 1 -> -- last part can be smaller but > 0
-                    all (>= mib64) (L.init sizes) && L.last sizes > 0
-                | length sizes == 1 -> maybe True (> 0) $ head sizes
-                | otherwise -> True
+          in n < 0 ||
+             (isPNumsAscendingFrom1 && isOffsetsAsc && isSumSizeOk &&
+              isSizesConstantExceptLast && isMinPartSizeOk)
+
+  , QC.testProperty "selectCopyRanges:" $
+    \(start, end) ->
+      let (_, pairs) = L.unzip (selectCopyRanges (start, end))
+
+          -- is last part's snd offset end?
+          isLastPartOk = maybe False ((end ==) . snd) $ lastMay pairs
+          -- is first part's fst offset start
+          isFirstPartOk = maybe False ((start ==) . fst) $ headMay pairs
+
+          -- each pair is >=64MiB except last, and all those parts
+          -- have same size.
+          initSizes = maybe [] (map (\(a, b) -> b - a + 1)) $ initMay pairs
+          isPartSizesOk = all (>= minPartSize) initSizes &&
+                          maybe True (\k -> all (== k) initSizes)
+                          (headMay initSizes)
+
+          -- returned offsets are contiguous.
+          fsts = drop 1 $ map fst pairs
+          snds = take (length pairs - 1) $ map snd pairs
+          isContParts = length fsts == length snds &&
+                        and (map (\(a, b) -> a == b + 1) $ zip fsts snds)
+
+      in start < 0 || start > end ||
+         (isLastPartOk && isFirstPartOk && isPartSizesOk && isContParts)
   ]
 
 unitTests :: TestTree