diff --git a/api/handler/handlers_test.go b/api/handler/handlers_test.go
index 42550db..0fecfc4 100644
--- a/api/handler/handlers_test.go
+++ b/api/handler/handlers_test.go
@@ -417,7 +417,7 @@ func createTestObject(hc *handlerContext, bktInfo *data.BucketInfo, objName stri
 	extObjInfo, err := hc.Layer().PutObject(hc.Context(), &layer.PutObjectParams{
 		BktInfo:    bktInfo,
 		Object:     objName,
-		Size:       uint64(len(content)),
+		Size:       ptr(uint64(len(content))),
 		Reader:     bytes.NewReader(content),
 		Header:     header,
 		Encryption: encryption,
diff --git a/api/handler/multipart_upload_test.go b/api/handler/multipart_upload_test.go
index d1b4a93..4df0b10 100644
--- a/api/handler/multipart_upload_test.go
+++ b/api/handler/multipart_upload_test.go
@@ -2,6 +2,7 @@ package handler
 
 import (
 	"crypto/md5"
+	"crypto/rand"
 	"crypto/tls"
 	"encoding/base64"
 	"encoding/hex"
@@ -621,6 +622,37 @@ func TestMultipartObjectLocation(t *testing.T) {
 	}
 }
 
+func TestUploadPartWithNegativeContentLength(t *testing.T) {
+	hc := prepareHandlerContext(t)
+
+	bktName, objName := "bucket-to-upload-part", "object-multipart"
+	createTestBucket(hc, bktName)
+	partSize := 5 * 1024 * 1024
+
+	multipartUpload := createMultipartUpload(hc, bktName, objName, map[string]string{})
+
+	partBody := make([]byte, partSize)
+	_, err := rand.Read(partBody)
+	require.NoError(hc.t, err)
+
+	query := make(url.Values)
+	query.Set(uploadIDQuery, multipartUpload.UploadID)
+	query.Set(partNumberQuery, "1")
+
+	w, r := prepareTestRequestWithQuery(hc, bktName, objName, query, partBody)
+	r.ContentLength = -1
+	hc.Handler().UploadPartHandler(w, r)
+	assertStatus(hc.t, w, http.StatusOK)
+
+	completeMultipartUpload(hc, bktName, objName, multipartUpload.UploadID, []string{w.Header().Get(api.ETag)})
+	res, _ := getObject(hc, bktName, objName)
+	equalDataSlices(t, partBody, res)
+
+	resp := getObjectAttributes(hc, bktName, objName, objectParts)
+	require.Len(t, resp.ObjectParts.Parts, 1)
+	require.Equal(t, partSize, resp.ObjectParts.Parts[0].Size)
+}
+
 func uploadPartCopy(hc *handlerContext, bktName, objName, uploadID string, num int, srcObj string, start, end int) *UploadPartCopyResponse {
 	return uploadPartCopyBase(hc, bktName, objName, false, uploadID, num, srcObj, start, end)
 }
diff --git a/api/handler/put.go b/api/handler/put.go
index 59c1499..8a7a10f 100644
--- a/api/handler/put.go
+++ b/api/handler/put.go
@@ -248,13 +248,16 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 		BktInfo:           bktInfo,
 		Object:            reqInfo.ObjectName,
 		Reader:            body,
-		Size:              size,
 		Header:            metadata,
 		Encryption:        encryptionParams,
 		ContentMD5:        r.Header.Get(api.ContentMD5),
 		ContentSHA256Hash: r.Header.Get(api.AmzContentSha256),
 	}
 
+	if size > 0 {
+		params.Size = &size
+	}
+
 	params.CopiesNumbers, err = h.pickCopiesNumbers(metadata, reqInfo.Namespace, bktInfo.LocationConstraint)
 	if err != nil {
 		h.logAndSendError(w, "invalid copies number", reqInfo, err)
@@ -517,7 +520,7 @@ func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
 		BktInfo: bktInfo,
 		Object:  reqInfo.ObjectName,
 		Reader:  contentReader,
-		Size:    size,
+		Size:    &size,
 		Header:  metadata,
 	}
 
diff --git a/api/handler/put_test.go b/api/handler/put_test.go
index 7477f07..570dfb6 100644
--- a/api/handler/put_test.go
+++ b/api/handler/put_test.go
@@ -250,6 +250,10 @@ func TestPutObjectWithNegativeContentLength(t *testing.T) {
 	tc.Handler().HeadObjectHandler(w, r)
 	assertStatus(t, w, http.StatusOK)
 	require.Equal(t, strconv.Itoa(len(content)), w.Header().Get(api.ContentLength))
+
+	result := listVersions(t, tc, bktName)
+	require.Len(t, result.Version, 1)
+	require.EqualValues(t, len(content), result.Version[0].Size)
 }
 
 func TestPutObjectWithStreamBodyError(t *testing.T) {
diff --git a/api/layer/layer.go b/api/layer/layer.go
index 236b973..0ccb01d 100644
--- a/api/layer/layer.go
+++ b/api/layer/layer.go
@@ -103,7 +103,7 @@ type (
 	PutObjectParams struct {
 		BktInfo           *data.BucketInfo
 		Object            string
-		Size              uint64
+		Size              *uint64
 		Reader            io.Reader
 		Header            map[string]string
 		Lock              *data.ObjectLock
@@ -528,7 +528,7 @@ func (n *Layer) CopyObject(ctx context.Context, p *CopyObjectParams) (*data.Exte
 	return n.PutObject(ctx, &PutObjectParams{
 		BktInfo:       p.DstBktInfo,
 		Object:        p.DstObject,
-		Size:          p.DstSize,
+		Size:          &p.DstSize,
 		Reader:        objPayload,
 		Header:        p.Header,
 		Encryption:    p.DstEncryption,
diff --git a/api/layer/multipart_upload.go b/api/layer/multipart_upload.go
index ce3f552..24ffa0e 100644
--- a/api/layer/multipart_upload.go
+++ b/api/layer/multipart_upload.go
@@ -460,7 +460,7 @@ func (n *Layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 		Object:          p.Info.Key,
 		Reader:          bytes.NewReader(partsData),
 		Header:          initMetadata,
-		Size:            multipartObjetSize,
+		Size:            &multipartObjetSize,
 		Encryption:      p.Info.Encryption,
 		CopiesNumbers:   multipartInfo.CopiesNumbers,
 		CompleteMD5Hash: hex.EncodeToString(md5Hash.Sum(nil)) + "-" + strconv.Itoa(len(p.Parts)),
diff --git a/api/layer/object.go b/api/layer/object.go
index 0a2b6de..fa8b2a9 100644
--- a/api/layer/object.go
+++ b/api/layer/object.go
@@ -232,16 +232,20 @@ func (n *Layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 
 	r := p.Reader
 	if p.Encryption.Enabled() {
-		p.Header[AttributeDecryptedSize] = strconv.FormatUint(p.Size, 10)
+		var size uint64
+		if p.Size != nil {
+			size = *p.Size
+		}
+		p.Header[AttributeDecryptedSize] = strconv.FormatUint(size, 10)
 		if err = addEncryptionHeaders(p.Header, p.Encryption); err != nil {
 			return nil, fmt.Errorf("add encryption header: %w", err)
 		}
 
 		var encSize uint64
-		if r, encSize, err = encryptionReader(p.Reader, p.Size, p.Encryption.Key()); err != nil {
+		if r, encSize, err = encryptionReader(p.Reader, size, p.Encryption.Key()); err != nil {
 			return nil, fmt.Errorf("create encrypter: %w", err)
 		}
-		p.Size = encSize
+		p.Size = &encSize
 	}
 
 	if r != nil {
@@ -260,12 +264,14 @@ func (n *Layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 
 	prm := PrmObjectCreate{
 		Container:    p.BktInfo.CID,
-		PayloadSize:  p.Size,
 		Filepath:     p.Object,
 		Payload:      r,
 		CreationTime: TimeNow(ctx),
 		CopiesNumber: p.CopiesNumbers,
 	}
+	if p.Size != nil {
+		prm.PayloadSize = *p.Size
+	}
 
 	prm.Attributes = make([][2]string, 0, len(p.Header))
 
@@ -313,7 +319,6 @@ func (n *Layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 			OID:           createdObj.ID,
 			ETag:          hex.EncodeToString(createdObj.HashSum),
 			FilePath:      p.Object,
-			Size:          p.Size,
 			Created:       &now,
 			Owner:         &n.gateOwner,
 			CreationEpoch: createdObj.CreationEpoch,
@@ -321,12 +326,19 @@ func (n *Layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 		IsUnversioned: !bktSettings.VersioningEnabled(),
 		IsCombined:    p.Header[MultipartObjectSize] != "",
 	}
+
 	if len(p.CompleteMD5Hash) > 0 {
 		newVersion.MD5 = p.CompleteMD5Hash
 	} else {
 		newVersion.MD5 = hex.EncodeToString(createdObj.MD5Sum)
 	}
 
+	if p.Size != nil {
+		newVersion.Size = *p.Size
+	} else {
+		newVersion.Size = createdObj.Size
+	}
+
 	if newVersion.ID, err = n.treeService.AddVersion(ctx, p.BktInfo, newVersion); err != nil {
 		return nil, fmt.Errorf("couldn't add new verion to tree service: %w", err)
 	}
diff --git a/api/layer/versioning_test.go b/api/layer/versioning_test.go
index d037c03..533a39b 100644
--- a/api/layer/versioning_test.go
+++ b/api/layer/versioning_test.go
@@ -23,7 +23,7 @@ func (tc *testContext) putObject(content []byte) *data.ObjectInfo {
 	extObjInfo, err := tc.layer.PutObject(tc.ctx, &PutObjectParams{
 		BktInfo: tc.bktInfo,
 		Object:  tc.obj,
-		Size:    uint64(len(content)),
+		Size:    ptr(uint64(len(content))),
 		Reader:  bytes.NewReader(content),
 		Header:  make(map[string]string),
 	})