diff --git a/pkg/core/object/fmt.go b/pkg/core/object/fmt.go
index 0eacbb545..a48290aaf 100644
--- a/pkg/core/object/fmt.go
+++ b/pkg/core/object/fmt.go
@@ -83,12 +83,13 @@ func NewFormatValidator(opts ...FormatValidatorOption) *FormatValidator {
 // Validate validates object format.
 //
 // Does not validate payload checksum and content.
+// If unprepared is true, only fields set by user are validated.
 //
 // Returns nil error if object has valid structure.
-func (v *FormatValidator) Validate(obj *object.Object) error {
+func (v *FormatValidator) Validate(obj *object.Object, unprepared bool) error {
 	if obj == nil {
 		return errNilObject
-	} else if obj.ID() == nil {
+	} else if !unprepared && obj.ID() == nil {
 		return errNilID
 	} else if obj.ContainerID() == nil {
 		return errNilCID
@@ -102,20 +103,23 @@ func (v *FormatValidator) Validate(obj *object.Object) error {
 		return fmt.Errorf("invalid attributes: %w", err)
 	}
 
-	if err := v.validateSignatureKey(obj); err != nil {
-		return fmt.Errorf("(%T) could not validate signature key: %w", v, err)
-	}
+	if !unprepared {
+		if err := v.validateSignatureKey(obj); err != nil {
+			return fmt.Errorf("(%T) could not validate signature key: %w", v, err)
+		}
 
-	if err := v.checkExpiration(obj); err != nil {
-		return fmt.Errorf("object did not pass expiration check: %w", err)
-	}
+		if err := v.checkExpiration(obj); err != nil {
+			return fmt.Errorf("object did not pass expiration check: %w", err)
+		}
 
-	if err := object.CheckHeaderVerificationFields(obj); err != nil {
-		return fmt.Errorf("(%T) could not validate header fields: %w", v, err)
+		if err := object.CheckHeaderVerificationFields(obj); err != nil {
+			return fmt.Errorf("(%T) could not validate header fields: %w", v, err)
+		}
 	}
 
 	if obj = obj.Parent(); obj != nil {
-		return v.Validate(obj)
+		// Parent object already exists.
+		return v.Validate(obj, false)
 	}
 
 	return nil
diff --git a/pkg/core/object/fmt_test.go b/pkg/core/object/fmt_test.go
index b64a0ecbf..548130e10 100644
--- a/pkg/core/object/fmt_test.go
+++ b/pkg/core/object/fmt_test.go
@@ -64,20 +64,20 @@ func TestFormatValidator_Validate(t *testing.T) {
 	require.NoError(t, err)
 
 	t.Run("nil input", func(t *testing.T) {
-		require.Error(t, v.Validate(nil))
+		require.Error(t, v.Validate(nil, true))
 	})
 
 	t.Run("nil identifier", func(t *testing.T) {
 		obj := object.New()
 
-		require.True(t, errors.Is(v.Validate(obj), errNilID))
+		require.True(t, errors.Is(v.Validate(obj, false), errNilID))
 	})
 
 	t.Run("nil container identifier", func(t *testing.T) {
 		obj := object.New()
 		obj.SetID(testObjectID(t))
 
-		require.True(t, errors.Is(v.Validate(obj), errNilCID))
+		require.True(t, errors.Is(v.Validate(obj, true), errNilCID))
 	})
 
 	t.Run("unsigned object", func(t *testing.T) {
@@ -85,7 +85,7 @@ func TestFormatValidator_Validate(t *testing.T) {
 		obj.SetContainerID(cidtest.ID())
 		obj.SetID(testObjectID(t))
 
-		require.Error(t, v.Validate(obj))
+		require.Error(t, v.Validate(obj, true))
 	})
 
 	t.Run("correct w/ session token", func(t *testing.T) {
@@ -101,7 +101,7 @@ func TestFormatValidator_Validate(t *testing.T) {
 
 		require.NoError(t, object.SetIDWithSignature(&ownerKey.PrivateKey, obj))
 
-		require.NoError(t, v.Validate(obj))
+		require.NoError(t, v.Validate(obj, false))
 	})
 
 	t.Run("correct w/o session token", func(t *testing.T) {
@@ -109,7 +109,7 @@ func TestFormatValidator_Validate(t *testing.T) {
 
 		require.NoError(t, object.SetIDWithSignature(&ownerKey.PrivateKey, obj))
 
-		require.NoError(t, v.Validate(obj))
+		require.NoError(t, v.Validate(obj, false))
 	})
 
 	t.Run("tombstone content", func(t *testing.T) {
@@ -197,19 +197,19 @@ func TestFormatValidator_Validate(t *testing.T) {
 
 		t.Run("invalid attribute value", func(t *testing.T) {
 			val := "text"
-			err := v.Validate(fn(val))
+			err := v.Validate(fn(val), false)
 			require.Error(t, err)
 		})
 
 		t.Run("expired object", func(t *testing.T) {
 			val := strconv.FormatUint(curEpoch-1, 10)
-			err := v.Validate(fn(val))
+			err := v.Validate(fn(val), false)
 			require.True(t, errors.Is(err, errExpired))
 		})
 
 		t.Run("alive object", func(t *testing.T) {
 			val := strconv.FormatUint(curEpoch, 10)
-			err := v.Validate(fn(val))
+			err := v.Validate(fn(val), true)
 			require.NoError(t, err)
 		})
 	})
diff --git a/pkg/services/object/put/streamer.go b/pkg/services/object/put/streamer.go
index b6d33a277..0b6764dbe 100644
--- a/pkg/services/object/put/streamer.go
+++ b/pkg/services/object/put/streamer.go
@@ -94,18 +94,21 @@ func (p *Streamer) initTarget(prm *PutInitPrm) error {
 	if sToken == nil && !prm.hdr.OwnerID().Equal(owner.NewIDFromPublicKey(&sessionKey.PublicKey)) {
 		return fmt.Errorf("(%T) session token is missing but object owner id is different from the default key", p)
 	}
-
-	p.target = transformer.NewPayloadSizeLimiter(
-		p.maxPayloadSz,
-		func() transformer.ObjectTarget {
-			return transformer.NewFormatTarget(&transformer.FormatterParams{
-				Key:          sessionKey,
-				NextTarget:   p.newCommonTarget(prm),
-				SessionToken: sToken,
-				NetworkState: p.networkState,
-			})
-		},
-	)
+	p.target = &validatingTarget{
+		fmt:              p.fmtValidator,
+		unpreparedObject: true,
+		nextTarget: transformer.NewPayloadSizeLimiter(
+			p.maxPayloadSz,
+			func() transformer.ObjectTarget {
+				return transformer.NewFormatTarget(&transformer.FormatterParams{
+					Key:          sessionKey,
+					NextTarget:   p.newCommonTarget(prm),
+					SessionToken: sToken,
+					NetworkState: p.networkState,
+				})
+			},
+		),
+	}
 
 	return nil
 }
diff --git a/pkg/services/object/put/validation.go b/pkg/services/object/put/validation.go
index e1470b22b..b338fb83b 100644
--- a/pkg/services/object/put/validation.go
+++ b/pkg/services/object/put/validation.go
@@ -14,11 +14,14 @@ import (
 	"github.com/nspcc-dev/tzhash/tz"
 )
 
+// validatingTarget validates object format and content.
 type validatingTarget struct {
 	nextTarget transformer.ObjectTarget
 
 	fmt *object.FormatValidator
 
+	unpreparedObject bool
+
 	hash hash.Hash
 
 	checksum []byte
@@ -40,29 +43,31 @@ func (t *validatingTarget) WriteHeader(obj *objectSDK.Object) error {
 	t.payloadSz = obj.PayloadSize()
 	chunkLn := uint64(len(obj.Payload()))
 
-	// check chunk size
-	if chunkLn > t.payloadSz {
-		return ErrWrongPayloadSize
+	if !t.unpreparedObject {
+		// check chunk size
+		if chunkLn > t.payloadSz {
+			return ErrWrongPayloadSize
+		}
+
+		// check payload size limit
+		if t.payloadSz > t.maxPayloadSz {
+			return ErrExceedingMaxSize
+		}
+
+		cs := obj.PayloadChecksum()
+		switch typ := cs.Type(); typ {
+		default:
+			return fmt.Errorf("(%T) unsupported payload checksum type %v", t, typ)
+		case checksum.SHA256:
+			t.hash = sha256.New()
+		case checksum.TZ:
+			t.hash = tz.New()
+		}
+
+		t.checksum = cs.Sum()
 	}
 
-	// check payload size limit
-	if t.payloadSz > t.maxPayloadSz {
-		return ErrExceedingMaxSize
-	}
-
-	cs := obj.PayloadChecksum()
-	switch typ := cs.Type(); typ {
-	default:
-		return fmt.Errorf("(%T) unsupported payload checksum type %v", t, typ)
-	case checksum.SHA256:
-		t.hash = sha256.New()
-	case checksum.TZ:
-		t.hash = tz.New()
-	}
-
-	t.checksum = cs.Sum()
-
-	if err := t.fmt.Validate(obj); err != nil {
+	if err := t.fmt.Validate(obj, t.unpreparedObject); err != nil {
 		return fmt.Errorf("(%T) coult not validate object format: %w", t, err)
 	}
 
@@ -71,11 +76,13 @@ func (t *validatingTarget) WriteHeader(obj *objectSDK.Object) error {
 		return err
 	}
 
-	// update written bytes
-	//
-	// Note: we MUST NOT add obj.PayloadSize() since obj
-	// can carry only the chunk of the full payload
-	t.writtenPayload += chunkLn
+	if !t.unpreparedObject {
+		// update written bytes
+		//
+		// Note: we MUST NOT add obj.PayloadSize() since obj
+		// can carry only the chunk of the full payload
+		t.writtenPayload += chunkLn
+	}
 
 	return nil
 }
@@ -83,14 +90,16 @@ func (t *validatingTarget) WriteHeader(obj *objectSDK.Object) error {
 func (t *validatingTarget) Write(p []byte) (n int, err error) {
 	chunkLn := uint64(len(p))
 
-	// check if new chunk will overflow payload size
-	if t.writtenPayload+chunkLn > t.payloadSz {
-		return 0, ErrWrongPayloadSize
-	}
+	if !t.unpreparedObject {
+		// check if new chunk will overflow payload size
+		if t.writtenPayload+chunkLn > t.payloadSz {
+			return 0, ErrWrongPayloadSize
+		}
 
-	_, err = t.hash.Write(p)
-	if err != nil {
-		return
+		_, err = t.hash.Write(p)
+		if err != nil {
+			return
+		}
 	}
 
 	n, err = t.nextTarget.Write(p)
@@ -102,13 +111,15 @@ func (t *validatingTarget) Write(p []byte) (n int, err error) {
 }
 
 func (t *validatingTarget) Close() (*transformer.AccessIdentifiers, error) {
-	// check payload size correctness
-	if t.payloadSz != t.writtenPayload {
-		return nil, ErrWrongPayloadSize
-	}
+	if !t.unpreparedObject {
+		// check payload size correctness
+		if t.payloadSz != t.writtenPayload {
+			return nil, ErrWrongPayloadSize
+		}
 
-	if !bytes.Equal(t.hash.Sum(nil), t.checksum) {
-		return nil, fmt.Errorf("(%T) incorrect payload checksum", t)
+		if !bytes.Equal(t.hash.Sum(nil), t.checksum) {
+			return nil, fmt.Errorf("(%T) incorrect payload checksum", t)
+		}
 	}
 
 	return t.nextTarget.Close()