diff --git a/.env.example b/.env.example
index 4b62825..0ab1d9b 100644
--- a/.env.example
+++ b/.env.example
@@ -7,4 +7,8 @@ S3_SESSION_TTL_SECONDS=3600
 CONVERSION_IMAGE_DPI=150
 CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS=180
 CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS=600
+CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS=45
+CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS=3
+CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS=30
+CONVERSION_PDF_TO_IMAGES_PER_SLIDE_TIMEOUT_SECONDS=8
 CONVERSION_CLEANUP_DELAY_SECONDS=3600
diff --git a/.gitignore b/.gitignore
index 493f6be..4c16649 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,3 +44,4 @@ coverage.out
 # But never track Python bytecode/cache artifacts from generated code.
 gen/**/__pycache__/
 gen/**/*.py[cod]
+.cache/
diff --git a/Makefile b/Makefile
index b8ef363..0720e7d 100644
--- a/Makefile
+++ b/Makefile
@@ -35,8 +35,12 @@ run-server:
 	export S3_ACCESS_KEY="$${S3_ACCESS_KEY:-minioadmin}"; \
 	export S3_SECRET_KEY="$${S3_SECRET_KEY:-minioadmin}"; \
 	export S3_SESSION_TTL_SECONDS="$${S3_SESSION_TTL_SECONDS:-3600}"; \
-	export CONVERSION_IMAGE_DPI="$${CONVERSION_IMAGE_DPI:-150}"; \
+	export CONVERSION_IMAGE_DPI="$${CONVERSION_IMAGE_DPI:-72}"; \
 	export CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS="$${CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS:-180}"; \
 	export CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS="$${CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS:-600}"; \
+	export CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS="$${CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS:-45}"; \
+	export CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS="$${CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS:-3}"; \
+	export CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS="$${CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS:-30}"; \
+	export CONVERSION_PDF_TO_IMAGES_PER_SLIDE_TIMEOUT_SECONDS="$${CONVERSION_PDF_TO_IMAGES_PER_SLIDE_TIMEOUT_SECONDS:-8}"; \
 	export CONVERSION_CLEANUP_DELAY_SECONDS="$${CONVERSION_CLEANUP_DELAY_SECONDS:-3600}"; \
 	uv run --project python --package officeconvert-server python -m uvicorn officeconvert_server.app:app --host "$${UVICORN_HOST:-0.0.0.0}" --port "$${UVICORN_PORT:-8080}"
diff --git a/deploy/docker-compose.yml b/deploy/docker-compose.yml
index d8a1ae4..b04cf0c 100644
--- a/deploy/docker-compose.yml
+++ b/deploy/docker-compose.yml
@@ -27,9 +27,13 @@ services:
       S3_ACCESS_KEY: ${S3_ACCESS_KEY:-minioadmin}
       S3_SECRET_KEY: ${S3_SECRET_KEY:-minioadmin}
       S3_SESSION_TTL_SECONDS: ${S3_SESSION_TTL_SECONDS:-3600}
-      CONVERSION_IMAGE_DPI: ${CONVERSION_IMAGE_DPI:-150}
+      CONVERSION_IMAGE_DPI: ${CONVERSION_IMAGE_DPI:-72}
       CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS: ${CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS:-180}
       CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS: ${CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS:-600}
+      CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS: ${CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS:-45}
+      CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS: ${CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS:-3}
+      CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS: ${CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS:-30}
+      CONVERSION_PDF_TO_IMAGES_PER_SLIDE_TIMEOUT_SECONDS: ${CONVERSION_PDF_TO_IMAGES_PER_SLIDE_TIMEOUT_SECONDS:-8}
       CONVERSION_CLEANUP_DELAY_SECONDS: ${CONVERSION_CLEANUP_DELAY_SECONDS:-3600}
     ports:
       - "8080:8080"
diff --git a/gen/go/officeconvertapi/v1/conversion.pb.go b/gen/go/officeconvertapi/v1/conversion.pb.go
index 3d222da..d8fe3a7 100644
--- a/gen/go/officeconvertapi/v1/conversion.pb.go
+++ b/gen/go/officeconvertapi/v1/conversion.pb.go
@@ -78,6 +78,65 @@ func (ConversionStatus) EnumDescriptor() ([]byte, []int) {
 	return file_officeconvertapi_v1_conversion_proto_rawDescGZIP(), []int{0}
 }
 
+// ConversionPhase represents the active stage for a running conversion.
+type ConversionPhase int32
+
+const (
+	ConversionPhase_CONVERSION_PHASE_UNSPECIFIED       ConversionPhase = 0
+	ConversionPhase_CONVERSION_PHASE_INACTIVE          ConversionPhase = 1
+	ConversionPhase_CONVERSION_PHASE_EXTRACTING_NOTES  ConversionPhase = 2
+	ConversionPhase_CONVERSION_PHASE_PPTX_TO_PDF       ConversionPhase = 3
+	ConversionPhase_CONVERSION_PHASE_PDF_TO_IMAGES     ConversionPhase = 4
+	ConversionPhase_CONVERSION_PHASE_UPLOADING_RESULTS ConversionPhase = 5
+)
+
+// Enum value maps for ConversionPhase.
+var (
+	ConversionPhase_name = map[int32]string{
+		0: "CONVERSION_PHASE_UNSPECIFIED",
+		1: "CONVERSION_PHASE_INACTIVE",
+		2: "CONVERSION_PHASE_EXTRACTING_NOTES",
+		3: "CONVERSION_PHASE_PPTX_TO_PDF",
+		4: "CONVERSION_PHASE_PDF_TO_IMAGES",
+		5: "CONVERSION_PHASE_UPLOADING_RESULTS",
+	}
+	ConversionPhase_value = map[string]int32{
+		"CONVERSION_PHASE_UNSPECIFIED":       0,
+		"CONVERSION_PHASE_INACTIVE":          1,
+		"CONVERSION_PHASE_EXTRACTING_NOTES":  2,
+		"CONVERSION_PHASE_PPTX_TO_PDF":       3,
+		"CONVERSION_PHASE_PDF_TO_IMAGES":     4,
+		"CONVERSION_PHASE_UPLOADING_RESULTS": 5,
+	}
+)
+
+func (x ConversionPhase) Enum() *ConversionPhase {
+	p := new(ConversionPhase)
+	*p = x
+	return p
+}
+
+func (x ConversionPhase) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (ConversionPhase) Descriptor() protoreflect.EnumDescriptor {
+	return file_officeconvertapi_v1_conversion_proto_enumTypes[1].Descriptor()
+}
+
+func (ConversionPhase) Type() protoreflect.EnumType {
+	return &file_officeconvertapi_v1_conversion_proto_enumTypes[1]
+}
+
+func (x ConversionPhase) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use ConversionPhase.Descriptor instead.
+func (ConversionPhase) EnumDescriptor() ([]byte, []int) {
+	return file_officeconvertapi_v1_conversion_proto_rawDescGZIP(), []int{1}
+}
+
 // Slide contains extracted notes and the rendered image URL for one slide.
 type Slide struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
@@ -475,13 +534,16 @@ func (x *GetConversionStatusRequest) GetConversionId() string {
 
 // GetConversionStatusResponse returns current status and optional error info.
 type GetConversionStatusResponse struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	ConversionId  string                 `protobuf:"bytes,1,opt,name=conversion_id,json=conversionId,proto3" json:"conversion_id,omitempty"`
-	Status        ConversionStatus       `protobuf:"varint,2,opt,name=status,proto3,enum=officeconvertapi.v1.ConversionStatus" json:"status,omitempty"`
-	ErrorMessage  string                 `protobuf:"bytes,3,opt,name=error_message,json=errorMessage,proto3" json:"error_message,omitempty"`
-	UpdatedAt     *timestamppb.Timestamp `protobuf:"bytes,4,opt,name=updated_at,json=updatedAt,proto3" json:"updated_at,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
+	state           protoimpl.MessageState `protogen:"open.v1"`
+	ConversionId    string                 `protobuf:"bytes,1,opt,name=conversion_id,json=conversionId,proto3" json:"conversion_id,omitempty"`
+	Status          ConversionStatus       `protobuf:"varint,2,opt,name=status,proto3,enum=officeconvertapi.v1.ConversionStatus" json:"status,omitempty"`
+	ErrorMessage    string                 `protobuf:"bytes,3,opt,name=error_message,json=errorMessage,proto3" json:"error_message,omitempty"`
+	UpdatedAt       *timestamppb.Timestamp `protobuf:"bytes,4,opt,name=updated_at,json=updatedAt,proto3" json:"updated_at,omitempty"`
+	Phase           ConversionPhase        `protobuf:"varint,5,opt,name=phase,proto3,enum=officeconvertapi.v1.ConversionPhase" json:"phase,omitempty"`
+	CurrentProgress int32                  `protobuf:"varint,6,opt,name=current_progress,json=currentProgress,proto3" json:"current_progress,omitempty"`
+	MaxProgress     int32                  `protobuf:"varint,7,opt,name=max_progress,json=maxProgress,proto3" json:"max_progress,omitempty"`
+	unknownFields   protoimpl.UnknownFields
+	sizeCache       protoimpl.SizeCache
 }
 
 func (x *GetConversionStatusResponse) Reset() {
@@ -542,6 +604,27 @@ func (x *GetConversionStatusResponse) GetUpdatedAt() *timestamppb.Timestamp {
 	return nil
 }
 
+func (x *GetConversionStatusResponse) GetPhase() ConversionPhase {
+	if x != nil {
+		return x.Phase
+	}
+	return ConversionPhase_CONVERSION_PHASE_UNSPECIFIED
+}
+
+func (x *GetConversionStatusResponse) GetCurrentProgress() int32 {
+	if x != nil {
+		return x.CurrentProgress
+	}
+	return 0
+}
+
+func (x *GetConversionStatusResponse) GetMaxProgress() int32 {
+	if x != nil {
+		return x.MaxProgress
+	}
+	return 0
+}
+
 // GetSlideDeckRequest fetches a completed deck.
 type GetSlideDeckRequest struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
@@ -762,13 +845,16 @@ const file_officeconvertapi_v1_conversion_proto_rawDesc = "" +
 	"\rconversion_id\x18\x01 \x01(\tR\fconversionId\x12=\n" +
 	"\x06status\x18\x02 \x01(\x0e2%.officeconvertapi.v1.ConversionStatusR\x06status\"A\n" +
 	"\x1aGetConversionStatusRequest\x12#\n" +
-	"\rconversion_id\x18\x01 \x01(\tR\fconversionId\"\xe1\x01\n" +
+	"\rconversion_id\x18\x01 \x01(\tR\fconversionId\"\xeb\x02\n" +
 	"\x1bGetConversionStatusResponse\x12#\n" +
 	"\rconversion_id\x18\x01 \x01(\tR\fconversionId\x12=\n" +
 	"\x06status\x18\x02 \x01(\x0e2%.officeconvertapi.v1.ConversionStatusR\x06status\x12#\n" +
 	"\rerror_message\x18\x03 \x01(\tR\ferrorMessage\x129\n" +
 	"\n" +
-	"updated_at\x18\x04 \x01(\v2\x1a.google.protobuf.TimestampR\tupdatedAt\":\n" +
+	"updated_at\x18\x04 \x01(\v2\x1a.google.protobuf.TimestampR\tupdatedAt\x12:\n" +
+	"\x05phase\x18\x05 \x01(\x0e2$.officeconvertapi.v1.ConversionPhaseR\x05phase\x12)\n" +
+	"\x10current_progress\x18\x06 \x01(\x05R\x0fcurrentProgress\x12!\n" +
+	"\fmax_progress\x18\a \x01(\x05R\vmaxProgress\":\n" +
 	"\x13GetSlideDeckRequest\x12#\n" +
 	"\rconversion_id\x18\x01 \x01(\tR\fconversionId\"U\n" +
 	"\x14GetSlideDeckResponse\x12=\n" +
@@ -784,7 +870,14 @@ const file_officeconvertapi_v1_conversion_proto_rawDesc = "" +
 	"\x19CONVERSION_STATUS_PENDING\x10\x01\x12\x1d\n" +
 	"\x19CONVERSION_STATUS_RUNNING\x10\x02\x12\x1f\n" +
 	"\x1bCONVERSION_STATUS_SUCCEEDED\x10\x03\x12\x1c\n" +
-	"\x18CONVERSION_STATUS_FAILED\x10\x042\xcc\x04\n" +
+	"\x18CONVERSION_STATUS_FAILED\x10\x04*\xe7\x01\n" +
+	"\x0fConversionPhase\x12 \n" +
+	"\x1cCONVERSION_PHASE_UNSPECIFIED\x10\x00\x12\x1d\n" +
+	"\x19CONVERSION_PHASE_INACTIVE\x10\x01\x12%\n" +
+	"!CONVERSION_PHASE_EXTRACTING_NOTES\x10\x02\x12 \n" +
+	"\x1cCONVERSION_PHASE_PPTX_TO_PDF\x10\x03\x12\"\n" +
+	"\x1eCONVERSION_PHASE_PDF_TO_IMAGES\x10\x04\x12&\n" +
+	"\"CONVERSION_PHASE_UPLOADING_RESULTS\x10\x052\xcc\x04\n" +
 	"\x11ConversionService\x12q\n" +
 	"\x10CreateConversion\x12,.officeconvertapi.v1.CreateConversionRequest\x1a-.officeconvertapi.v1.CreateConversionResponse\"\x00\x12n\n" +
 	"\x0fStartConversion\x12+.officeconvertapi.v1.StartConversionRequest\x1a,.officeconvertapi.v1.StartConversionResponse\"\x00\x12z\n" +
@@ -804,47 +897,49 @@ func file_officeconvertapi_v1_conversion_proto_rawDescGZIP() []byte {
 	return file_officeconvertapi_v1_conversion_proto_rawDescData
 }
 
-var file_officeconvertapi_v1_conversion_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_officeconvertapi_v1_conversion_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
 var file_officeconvertapi_v1_conversion_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
 var file_officeconvertapi_v1_conversion_proto_goTypes = []any{
 	(ConversionStatus)(0),               // 0: officeconvertapi.v1.ConversionStatus
-	(*Slide)(nil),                       // 1: officeconvertapi.v1.Slide
-	(*SlideDeck)(nil),                   // 2: officeconvertapi.v1.SlideDeck
-	(*CreateConversionRequest)(nil),     // 3: officeconvertapi.v1.CreateConversionRequest
-	(*CreateConversionResponse)(nil),    // 4: officeconvertapi.v1.CreateConversionResponse
-	(*StartConversionRequest)(nil),      // 5: officeconvertapi.v1.StartConversionRequest
-	(*StartConversionResponse)(nil),     // 6: officeconvertapi.v1.StartConversionResponse
-	(*GetConversionStatusRequest)(nil),  // 7: officeconvertapi.v1.GetConversionStatusRequest
-	(*GetConversionStatusResponse)(nil), // 8: officeconvertapi.v1.GetConversionStatusResponse
-	(*GetSlideDeckRequest)(nil),         // 9: officeconvertapi.v1.GetSlideDeckRequest
-	(*GetSlideDeckResponse)(nil),        // 10: officeconvertapi.v1.GetSlideDeckResponse
-	(*DeleteConversionRequest)(nil),     // 11: officeconvertapi.v1.DeleteConversionRequest
-	(*DeleteConversionResponse)(nil),    // 12: officeconvertapi.v1.DeleteConversionResponse
-	(*timestamppb.Timestamp)(nil),       // 13: google.protobuf.Timestamp
+	(ConversionPhase)(0),                // 1: officeconvertapi.v1.ConversionPhase
+	(*Slide)(nil),                       // 2: officeconvertapi.v1.Slide
+	(*SlideDeck)(nil),                   // 3: officeconvertapi.v1.SlideDeck
+	(*CreateConversionRequest)(nil),     // 4: officeconvertapi.v1.CreateConversionRequest
+	(*CreateConversionResponse)(nil),    // 5: officeconvertapi.v1.CreateConversionResponse
+	(*StartConversionRequest)(nil),      // 6: officeconvertapi.v1.StartConversionRequest
+	(*StartConversionResponse)(nil),     // 7: officeconvertapi.v1.StartConversionResponse
+	(*GetConversionStatusRequest)(nil),  // 8: officeconvertapi.v1.GetConversionStatusRequest
+	(*GetConversionStatusResponse)(nil), // 9: officeconvertapi.v1.GetConversionStatusResponse
+	(*GetSlideDeckRequest)(nil),         // 10: officeconvertapi.v1.GetSlideDeckRequest
+	(*GetSlideDeckResponse)(nil),        // 11: officeconvertapi.v1.GetSlideDeckResponse
+	(*DeleteConversionRequest)(nil),     // 12: officeconvertapi.v1.DeleteConversionRequest
+	(*DeleteConversionResponse)(nil),    // 13: officeconvertapi.v1.DeleteConversionResponse
+	(*timestamppb.Timestamp)(nil),       // 14: google.protobuf.Timestamp
 }
 var file_officeconvertapi_v1_conversion_proto_depIdxs = []int32{
-	1,  // 0: officeconvertapi.v1.SlideDeck.slides:type_name -> officeconvertapi.v1.Slide
-	13, // 1: officeconvertapi.v1.SlideDeck.created_at:type_name -> google.protobuf.Timestamp
-	13, // 2: officeconvertapi.v1.CreateConversionResponse.expires_at:type_name -> google.protobuf.Timestamp
+	2,  // 0: officeconvertapi.v1.SlideDeck.slides:type_name -> officeconvertapi.v1.Slide
+	14, // 1: officeconvertapi.v1.SlideDeck.created_at:type_name -> google.protobuf.Timestamp
+	14, // 2: officeconvertapi.v1.CreateConversionResponse.expires_at:type_name -> google.protobuf.Timestamp
 	0,  // 3: officeconvertapi.v1.StartConversionResponse.status:type_name -> officeconvertapi.v1.ConversionStatus
 	0,  // 4: officeconvertapi.v1.GetConversionStatusResponse.status:type_name -> officeconvertapi.v1.ConversionStatus
-	13, // 5: officeconvertapi.v1.GetConversionStatusResponse.updated_at:type_name -> google.protobuf.Timestamp
-	2,  // 6: officeconvertapi.v1.GetSlideDeckResponse.slide_deck:type_name -> officeconvertapi.v1.SlideDeck
-	3,  // 7: officeconvertapi.v1.ConversionService.CreateConversion:input_type -> officeconvertapi.v1.CreateConversionRequest
-	5,  // 8: officeconvertapi.v1.ConversionService.StartConversion:input_type -> officeconvertapi.v1.StartConversionRequest
-	7,  // 9: officeconvertapi.v1.ConversionService.GetConversionStatus:input_type -> officeconvertapi.v1.GetConversionStatusRequest
-	9,  // 10: officeconvertapi.v1.ConversionService.GetSlideDeck:input_type -> officeconvertapi.v1.GetSlideDeckRequest
-	11, // 11: officeconvertapi.v1.ConversionService.DeleteConversion:input_type -> officeconvertapi.v1.DeleteConversionRequest
-	4,  // 12: officeconvertapi.v1.ConversionService.CreateConversion:output_type -> officeconvertapi.v1.CreateConversionResponse
-	6,  // 13: officeconvertapi.v1.ConversionService.StartConversion:output_type -> officeconvertapi.v1.StartConversionResponse
-	8,  // 14: officeconvertapi.v1.ConversionService.GetConversionStatus:output_type -> officeconvertapi.v1.GetConversionStatusResponse
-	10, // 15: officeconvertapi.v1.ConversionService.GetSlideDeck:output_type -> officeconvertapi.v1.GetSlideDeckResponse
-	12, // 16: officeconvertapi.v1.ConversionService.DeleteConversion:output_type -> officeconvertapi.v1.DeleteConversionResponse
-	12, // [12:17] is the sub-list for method output_type
-	7,  // [7:12] is the sub-list for method input_type
-	7,  // [7:7] is the sub-list for extension type_name
-	7,  // [7:7] is the sub-list for extension extendee
-	0,  // [0:7] is the sub-list for field type_name
+	14, // 5: officeconvertapi.v1.GetConversionStatusResponse.updated_at:type_name -> google.protobuf.Timestamp
+	1,  // 6: officeconvertapi.v1.GetConversionStatusResponse.phase:type_name -> officeconvertapi.v1.ConversionPhase
+	3,  // 7: officeconvertapi.v1.GetSlideDeckResponse.slide_deck:type_name -> officeconvertapi.v1.SlideDeck
+	4,  // 8: officeconvertapi.v1.ConversionService.CreateConversion:input_type -> officeconvertapi.v1.CreateConversionRequest
+	6,  // 9: officeconvertapi.v1.ConversionService.StartConversion:input_type -> officeconvertapi.v1.StartConversionRequest
+	8,  // 10: officeconvertapi.v1.ConversionService.GetConversionStatus:input_type -> officeconvertapi.v1.GetConversionStatusRequest
+	10, // 11: officeconvertapi.v1.ConversionService.GetSlideDeck:input_type -> officeconvertapi.v1.GetSlideDeckRequest
+	12, // 12: officeconvertapi.v1.ConversionService.DeleteConversion:input_type -> officeconvertapi.v1.DeleteConversionRequest
+	5,  // 13: officeconvertapi.v1.ConversionService.CreateConversion:output_type -> officeconvertapi.v1.CreateConversionResponse
+	7,  // 14: officeconvertapi.v1.ConversionService.StartConversion:output_type -> officeconvertapi.v1.StartConversionResponse
+	9,  // 15: officeconvertapi.v1.ConversionService.GetConversionStatus:output_type -> officeconvertapi.v1.GetConversionStatusResponse
+	11, // 16: officeconvertapi.v1.ConversionService.GetSlideDeck:output_type -> officeconvertapi.v1.GetSlideDeckResponse
+	13, // 17: officeconvertapi.v1.ConversionService.DeleteConversion:output_type -> officeconvertapi.v1.DeleteConversionResponse
+	13, // [13:18] is the sub-list for method output_type
+	8,  // [8:13] is the sub-list for method input_type
+	8,  // [8:8] is the sub-list for extension type_name
+	8,  // [8:8] is the sub-list for extension extendee
+	0,  // [0:8] is the sub-list for field type_name
 }
 
 func init() { file_officeconvertapi_v1_conversion_proto_init() }
@@ -857,7 +952,7 @@ func file_officeconvertapi_v1_conversion_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_officeconvertapi_v1_conversion_proto_rawDesc), len(file_officeconvertapi_v1_conversion_proto_rawDesc)),
-			NumEnums:      1,
+			NumEnums:      2,
 			NumMessages:   12,
 			NumExtensions: 0,
 			NumServices:   1,
diff --git a/gen/python/officeconvertapi/v1/conversion_pb2.py b/gen/python/officeconvertapi/v1/conversion_pb2.py
index 6f76af6..c7a25d8 100644
--- a/gen/python/officeconvertapi/v1/conversion_pb2.py
+++ b/gen/python/officeconvertapi/v1/conversion_pb2.py
@@ -25,7 +25,7 @@ _sym_db = _symbol_database.Default()
 from google.protobuf import timestamp_pb2 as google_dot_protobuf_dot_timestamp__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n$officeconvertapi/v1/conversion.proto\x12\x13officeconvertapi.v1\x1a\x1fgoogle/protobuf/timestamp.proto\"[\n\x05Slide\x12\x14\n\x05index\x18\x01 \x01(\x05R\x05index\x12\x1f\n\x0bnotes_plain\x18\x02 \x01(\tR\nnotesPlain\x12\x1b\n\timage_url\x18\x03 \x01(\tR\x08imageUrl\"\xc8\x01\n\tSlideDeck\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12\'\n\x0fsource_filename\x18\x02 \x01(\tR\x0esourceFilename\x12\x32\n\x06slides\x18\x03 \x03(\x0b\x32\x1a.officeconvertapi.v1.SlideR\x06slides\x12\x39\n\ncreated_at\x18\x04 \x01(\x0b\x32\x1a.google.protobuf.TimestampR\tcreatedAt\"B\n\x17\x43reateConversionRequest\x12\'\n\x0fsource_filename\x18\x01 \x01(\tR\x0esourceFilename\"\xea\x01\n\x18\x43reateConversionResponse\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12#\n\rupload_bucket\x18\x02 \x01(\tR\x0cuploadBucket\x12*\n\x11upload_object_key\x18\x03 \x01(\tR\x0fuploadObjectKey\x12\x1d\n\nupload_url\x18\x04 \x01(\tR\tuploadUrl\x12\x39\n\nexpires_at\x18\x05 \x01(\x0b\x32\x1a.google.protobuf.TimestampR\texpiresAt\"=\n\x16StartConversionRequest\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\"}\n\x17StartConversionResponse\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12=\n\x06status\x18\x02 \x01(\x0e\x32%.officeconvertapi.v1.ConversionStatusR\x06status\"A\n\x1aGetConversionStatusRequest\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\"\xe1\x01\n\x1bGetConversionStatusResponse\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12=\n\x06status\x18\x02 \x01(\x0e\x32%.officeconvertapi.v1.ConversionStatusR\x06status\x12#\n\rerror_message\x18\x03 \x01(\tR\x0c\x65rrorMessage\x12\x39\n\nupdated_at\x18\x04 \x01(\x0b\x32\x1a.google.protobuf.TimestampR\tupdatedAt\":\n\x13GetSlideDeckRequest\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\"U\n\x14GetSlideDeckResponse\x12=\n\nslide_deck\x18\x01 \x01(\x0b\x32\x1e.officeconvertapi.v1.SlideDeckR\tslideDeck\">\n\x17\x44\x65leteConversionRequest\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\"Y\n\x18\x44\x65leteConversionResponse\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12\x18\n\x07\x64\x65leted\x18\x02 \x01(\x08R\x07\x64\x65leted*\xb2\x01\n\x10\x43onversionStatus\x12!\n\x1d\x43ONVERSION_STATUS_UNSPECIFIED\x10\x00\x12\x1d\n\x19\x43ONVERSION_STATUS_PENDING\x10\x01\x12\x1d\n\x19\x43ONVERSION_STATUS_RUNNING\x10\x02\x12\x1f\n\x1b\x43ONVERSION_STATUS_SUCCEEDED\x10\x03\x12\x1c\n\x18\x43ONVERSION_STATUS_FAILED\x10\x04\x32\xcc\x04\n\x11\x43onversionService\x12q\n\x10\x43reateConversion\x12,.officeconvertapi.v1.CreateConversionRequest\x1a-.officeconvertapi.v1.CreateConversionResponse\"\x00\x12n\n\x0fStartConversion\x12+.officeconvertapi.v1.StartConversionRequest\x1a,.officeconvertapi.v1.StartConversionResponse\"\x00\x12z\n\x13GetConversionStatus\x12/.officeconvertapi.v1.GetConversionStatusRequest\x1a\x30.officeconvertapi.v1.GetConversionStatusResponse\"\x00\x12\x65\n\x0cGetSlideDeck\x12(.officeconvertapi.v1.GetSlideDeckRequest\x1a).officeconvertapi.v1.GetSlideDeckResponse\"\x00\x12q\n\x10\x44\x65leteConversion\x12,.officeconvertapi.v1.DeleteConversionRequest\x1a-.officeconvertapi.v1.DeleteConversionResponse\"\x00\x42LZJgithub.com/end/officeconvert/gen/go/officeconvertapi/v1;officeconvertapiv1b\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n$officeconvertapi/v1/conversion.proto\x12\x13officeconvertapi.v1\x1a\x1fgoogle/protobuf/timestamp.proto\"[\n\x05Slide\x12\x14\n\x05index\x18\x01 \x01(\x05R\x05index\x12\x1f\n\x0bnotes_plain\x18\x02 \x01(\tR\nnotesPlain\x12\x1b\n\timage_url\x18\x03 \x01(\tR\x08imageUrl\"\xc8\x01\n\tSlideDeck\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12\'\n\x0fsource_filename\x18\x02 \x01(\tR\x0esourceFilename\x12\x32\n\x06slides\x18\x03 \x03(\x0b\x32\x1a.officeconvertapi.v1.SlideR\x06slides\x12\x39\n\ncreated_at\x18\x04 \x01(\x0b\x32\x1a.google.protobuf.TimestampR\tcreatedAt\"B\n\x17\x43reateConversionRequest\x12\'\n\x0fsource_filename\x18\x01 \x01(\tR\x0esourceFilename\"\xea\x01\n\x18\x43reateConversionResponse\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12#\n\rupload_bucket\x18\x02 \x01(\tR\x0cuploadBucket\x12*\n\x11upload_object_key\x18\x03 \x01(\tR\x0fuploadObjectKey\x12\x1d\n\nupload_url\x18\x04 \x01(\tR\tuploadUrl\x12\x39\n\nexpires_at\x18\x05 \x01(\x0b\x32\x1a.google.protobuf.TimestampR\texpiresAt\"=\n\x16StartConversionRequest\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\"}\n\x17StartConversionResponse\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12=\n\x06status\x18\x02 \x01(\x0e\x32%.officeconvertapi.v1.ConversionStatusR\x06status\"A\n\x1aGetConversionStatusRequest\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\"\xeb\x02\n\x1bGetConversionStatusResponse\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12=\n\x06status\x18\x02 \x01(\x0e\x32%.officeconvertapi.v1.ConversionStatusR\x06status\x12#\n\rerror_message\x18\x03 \x01(\tR\x0c\x65rrorMessage\x12\x39\n\nupdated_at\x18\x04 \x01(\x0b\x32\x1a.google.protobuf.TimestampR\tupdatedAt\x12:\n\x05phase\x18\x05 \x01(\x0e\x32$.officeconvertapi.v1.ConversionPhaseR\x05phase\x12)\n\x10\x63urrent_progress\x18\x06 \x01(\x05R\x0f\x63urrentProgress\x12!\n\x0cmax_progress\x18\x07 \x01(\x05R\x0bmaxProgress\":\n\x13GetSlideDeckRequest\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\"U\n\x14GetSlideDeckResponse\x12=\n\nslide_deck\x18\x01 \x01(\x0b\x32\x1e.officeconvertapi.v1.SlideDeckR\tslideDeck\">\n\x17\x44\x65leteConversionRequest\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\"Y\n\x18\x44\x65leteConversionResponse\x12#\n\rconversion_id\x18\x01 \x01(\tR\x0c\x63onversionId\x12\x18\n\x07\x64\x65leted\x18\x02 \x01(\x08R\x07\x64\x65leted*\xb2\x01\n\x10\x43onversionStatus\x12!\n\x1d\x43ONVERSION_STATUS_UNSPECIFIED\x10\x00\x12\x1d\n\x19\x43ONVERSION_STATUS_PENDING\x10\x01\x12\x1d\n\x19\x43ONVERSION_STATUS_RUNNING\x10\x02\x12\x1f\n\x1b\x43ONVERSION_STATUS_SUCCEEDED\x10\x03\x12\x1c\n\x18\x43ONVERSION_STATUS_FAILED\x10\x04*\xe7\x01\n\x0f\x43onversionPhase\x12 \n\x1c\x43ONVERSION_PHASE_UNSPECIFIED\x10\x00\x12\x1d\n\x19\x43ONVERSION_PHASE_INACTIVE\x10\x01\x12%\n!CONVERSION_PHASE_EXTRACTING_NOTES\x10\x02\x12 \n\x1c\x43ONVERSION_PHASE_PPTX_TO_PDF\x10\x03\x12\"\n\x1e\x43ONVERSION_PHASE_PDF_TO_IMAGES\x10\x04\x12&\n\"CONVERSION_PHASE_UPLOADING_RESULTS\x10\x05\x32\xcc\x04\n\x11\x43onversionService\x12q\n\x10\x43reateConversion\x12,.officeconvertapi.v1.CreateConversionRequest\x1a-.officeconvertapi.v1.CreateConversionResponse\"\x00\x12n\n\x0fStartConversion\x12+.officeconvertapi.v1.StartConversionRequest\x1a,.officeconvertapi.v1.StartConversionResponse\"\x00\x12z\n\x13GetConversionStatus\x12/.officeconvertapi.v1.GetConversionStatusRequest\x1a\x30.officeconvertapi.v1.GetConversionStatusResponse\"\x00\x12\x65\n\x0cGetSlideDeck\x12(.officeconvertapi.v1.GetSlideDeckRequest\x1a).officeconvertapi.v1.GetSlideDeckResponse\"\x00\x12q\n\x10\x44\x65leteConversion\x12,.officeconvertapi.v1.DeleteConversionRequest\x1a-.officeconvertapi.v1.DeleteConversionResponse\"\x00\x42LZJgithub.com/end/officeconvert/gen/go/officeconvertapi/v1;officeconvertapiv1b\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -33,8 +33,10 @@ _builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'officeconvertapi.v1.convers
 if not _descriptor._USE_C_DESCRIPTORS:
   _globals['DESCRIPTOR']._loaded_options = None
   _globals['DESCRIPTOR']._serialized_options = b'ZJgithub.com/end/officeconvert/gen/go/officeconvertapi/v1;officeconvertapiv1'
-  _globals['_CONVERSIONSTATUS']._serialized_start=1483
-  _globals['_CONVERSIONSTATUS']._serialized_end=1661
+  _globals['_CONVERSIONSTATUS']._serialized_start=1621
+  _globals['_CONVERSIONSTATUS']._serialized_end=1799
+  _globals['_CONVERSIONPHASE']._serialized_start=1802
+  _globals['_CONVERSIONPHASE']._serialized_end=2033
   _globals['_SLIDE']._serialized_start=94
   _globals['_SLIDE']._serialized_end=185
   _globals['_SLIDEDECK']._serialized_start=188
@@ -50,15 +52,15 @@ if not _descriptor._USE_C_DESCRIPTORS:
   _globals['_GETCONVERSIONSTATUSREQUEST']._serialized_start=885
   _globals['_GETCONVERSIONSTATUSREQUEST']._serialized_end=950
   _globals['_GETCONVERSIONSTATUSRESPONSE']._serialized_start=953
-  _globals['_GETCONVERSIONSTATUSRESPONSE']._serialized_end=1178
-  _globals['_GETSLIDEDECKREQUEST']._serialized_start=1180
-  _globals['_GETSLIDEDECKREQUEST']._serialized_end=1238
-  _globals['_GETSLIDEDECKRESPONSE']._serialized_start=1240
-  _globals['_GETSLIDEDECKRESPONSE']._serialized_end=1325
-  _globals['_DELETECONVERSIONREQUEST']._serialized_start=1327
-  _globals['_DELETECONVERSIONREQUEST']._serialized_end=1389
-  _globals['_DELETECONVERSIONRESPONSE']._serialized_start=1391
-  _globals['_DELETECONVERSIONRESPONSE']._serialized_end=1480
-  _globals['_CONVERSIONSERVICE']._serialized_start=1664
-  _globals['_CONVERSIONSERVICE']._serialized_end=2252
+  _globals['_GETCONVERSIONSTATUSRESPONSE']._serialized_end=1316
+  _globals['_GETSLIDEDECKREQUEST']._serialized_start=1318
+  _globals['_GETSLIDEDECKREQUEST']._serialized_end=1376
+  _globals['_GETSLIDEDECKRESPONSE']._serialized_start=1378
+  _globals['_GETSLIDEDECKRESPONSE']._serialized_end=1463
+  _globals['_DELETECONVERSIONREQUEST']._serialized_start=1465
+  _globals['_DELETECONVERSIONREQUEST']._serialized_end=1527
+  _globals['_DELETECONVERSIONRESPONSE']._serialized_start=1529
+  _globals['_DELETECONVERSIONRESPONSE']._serialized_end=1618
+  _globals['_CONVERSIONSERVICE']._serialized_start=2036
+  _globals['_CONVERSIONSERVICE']._serialized_end=2624
 # @@protoc_insertion_point(module_scope)
diff --git a/gen/python/officeconvertapi/v1/conversion_pb2.pyi b/gen/python/officeconvertapi/v1/conversion_pb2.pyi
index 877b479..23d7116 100644
--- a/gen/python/officeconvertapi/v1/conversion_pb2.pyi
+++ b/gen/python/officeconvertapi/v1/conversion_pb2.pyi
@@ -17,11 +17,26 @@ class ConversionStatus(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
     CONVERSION_STATUS_RUNNING: _ClassVar[ConversionStatus]
     CONVERSION_STATUS_SUCCEEDED: _ClassVar[ConversionStatus]
     CONVERSION_STATUS_FAILED: _ClassVar[ConversionStatus]
+
+class ConversionPhase(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
+    __slots__ = ()
+    CONVERSION_PHASE_UNSPECIFIED: _ClassVar[ConversionPhase]
+    CONVERSION_PHASE_INACTIVE: _ClassVar[ConversionPhase]
+    CONVERSION_PHASE_EXTRACTING_NOTES: _ClassVar[ConversionPhase]
+    CONVERSION_PHASE_PPTX_TO_PDF: _ClassVar[ConversionPhase]
+    CONVERSION_PHASE_PDF_TO_IMAGES: _ClassVar[ConversionPhase]
+    CONVERSION_PHASE_UPLOADING_RESULTS: _ClassVar[ConversionPhase]
 CONVERSION_STATUS_UNSPECIFIED: ConversionStatus
 CONVERSION_STATUS_PENDING: ConversionStatus
 CONVERSION_STATUS_RUNNING: ConversionStatus
 CONVERSION_STATUS_SUCCEEDED: ConversionStatus
 CONVERSION_STATUS_FAILED: ConversionStatus
+CONVERSION_PHASE_UNSPECIFIED: ConversionPhase
+CONVERSION_PHASE_INACTIVE: ConversionPhase
+CONVERSION_PHASE_EXTRACTING_NOTES: ConversionPhase
+CONVERSION_PHASE_PPTX_TO_PDF: ConversionPhase
+CONVERSION_PHASE_PDF_TO_IMAGES: ConversionPhase
+CONVERSION_PHASE_UPLOADING_RESULTS: ConversionPhase
 
 class Slide(_message.Message):
     __slots__ = ("index", "notes_plain", "image_url")
@@ -86,16 +101,22 @@ class GetConversionStatusRequest(_message.Message):
     def __init__(self, conversion_id: _Optional[str] = ...) -> None: ...
 
 class GetConversionStatusResponse(_message.Message):
-    __slots__ = ("conversion_id", "status", "error_message", "updated_at")
+    __slots__ = ("conversion_id", "status", "error_message", "updated_at", "phase", "current_progress", "max_progress")
     CONVERSION_ID_FIELD_NUMBER: _ClassVar[int]
     STATUS_FIELD_NUMBER: _ClassVar[int]
     ERROR_MESSAGE_FIELD_NUMBER: _ClassVar[int]
     UPDATED_AT_FIELD_NUMBER: _ClassVar[int]
+    PHASE_FIELD_NUMBER: _ClassVar[int]
+    CURRENT_PROGRESS_FIELD_NUMBER: _ClassVar[int]
+    MAX_PROGRESS_FIELD_NUMBER: _ClassVar[int]
     conversion_id: str
     status: ConversionStatus
     error_message: str
     updated_at: _timestamp_pb2.Timestamp
-    def __init__(self, conversion_id: _Optional[str] = ..., status: _Optional[_Union[ConversionStatus, str]] = ..., error_message: _Optional[str] = ..., updated_at: _Optional[_Union[datetime.datetime, _timestamp_pb2.Timestamp, _Mapping]] = ...) -> None: ...
+    phase: ConversionPhase
+    current_progress: int
+    max_progress: int
+    def __init__(self, conversion_id: _Optional[str] = ..., status: _Optional[_Union[ConversionStatus, str]] = ..., error_message: _Optional[str] = ..., updated_at: _Optional[_Union[datetime.datetime, _timestamp_pb2.Timestamp, _Mapping]] = ..., phase: _Optional[_Union[ConversionPhase, str]] = ..., current_progress: _Optional[int] = ..., max_progress: _Optional[int] = ...) -> None: ...
 
 class GetSlideDeckRequest(_message.Message):
     __slots__ = ("conversion_id",)
diff --git a/proto/officeconvertapi/v1/conversion.proto b/proto/officeconvertapi/v1/conversion.proto
index a2e4cc0..e6ebba0 100644
--- a/proto/officeconvertapi/v1/conversion.proto
+++ b/proto/officeconvertapi/v1/conversion.proto
@@ -33,6 +33,16 @@ enum ConversionStatus {
   CONVERSION_STATUS_FAILED = 4;
 }
 
+// ConversionPhase represents the active stage for a running conversion.
+enum ConversionPhase {
+  CONVERSION_PHASE_UNSPECIFIED = 0;
+  CONVERSION_PHASE_INACTIVE = 1;
+  CONVERSION_PHASE_EXTRACTING_NOTES = 2;
+  CONVERSION_PHASE_PPTX_TO_PDF = 3;
+  CONVERSION_PHASE_PDF_TO_IMAGES = 4;
+  CONVERSION_PHASE_UPLOADING_RESULTS = 5;
+}
+
 // Slide contains extracted notes and the rendered image URL for one slide.
 message Slide {
   int32 index = 1;
@@ -84,6 +94,9 @@ message GetConversionStatusResponse {
   ConversionStatus status = 2;
   string error_message = 3;
   google.protobuf.Timestamp updated_at = 4;
+  ConversionPhase phase = 5;
+  int32 current_progress = 6;
+  int32 max_progress = 7;
 }
 
 // GetSlideDeckRequest fetches a completed deck.
diff --git a/python/packages/officeconvert/src/officeconvert/conversion.py b/python/packages/officeconvert/src/officeconvert/conversion.py
index b9ea7b0..16649fc 100644
--- a/python/packages/officeconvert/src/officeconvert/conversion.py
+++ b/python/packages/officeconvert/src/officeconvert/conversion.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from collections.abc import Callable
 from dataclasses import dataclass
 from pathlib import Path
 import subprocess
@@ -27,6 +28,14 @@ class SlideDeckResult:
     slides: list[SlideArtifact]
 
 
+ProgressCallback = Callable[[str, int, int], None]
+PageProgressCallback = Callable[[int, int], None]
+
+PHASE_EXTRACTING_NOTES = "extracting_notes"
+PHASE_PPTX_TO_PDF = "pptx_to_pdf"
+PHASE_PDF_TO_IMAGES = "pdf_to_images"
+
+
 def convert_pptx_to_pdf(pptx_path: Path, pdf_path: Path, *, timeout_s: int = 120) -> Path:
     """Convert a PPTX file to PDF using headless LibreOffice.
 
@@ -92,6 +101,8 @@ def render_pdf_to_images(
     dpi: int = 180,
     image_format: str = "png",
     timeout_s: int = 120,
+    total_pages: int | None = None,
+    page_progress_callback: PageProgressCallback | None = None,
 ) -> list[Path]:
     """Render each PDF page into an image using Poppler's `pdftoppm`.
 
@@ -113,35 +124,83 @@ def render_pdf_to_images(
         raise FileNotFoundError(f"source PDF does not exist: {pdf_path}")
 
     out_dir.mkdir(parents=True, exist_ok=True)
-    prefix_path = out_dir / "slide"
-    command = [
-        "pdftoppm",
-        "-r",
-        str(dpi),
-        f"-{image_format}",
-        str(pdf_path.resolve()),
-        str(prefix_path),
-    ]
-    try:
-        completed = subprocess.run(
-            command,
-            check=False,
-            capture_output=True,
-            text=True,
-            timeout=timeout_s,
-        )
-    except subprocess.TimeoutExpired as exc:
-        raise RuntimeError(
-            "Poppler rasterization timed out after "
-            f"{timeout_s} seconds while rendering {pdf_path.name}; "
-            "increase conversion PDF render timeout or lower image DPI"
-        ) from exc
-    if completed.returncode != 0:
-        raise RuntimeError(
-            f"Poppler rasterization failed: {completed.stderr.strip() or completed.stdout.strip()}"
-        )
+    if total_pages is None:
+        prefix_path = out_dir / "slide"
+        command = [
+            "pdftoppm",
+            "-r",
+            str(dpi),
+            f"-{image_format}",
+            str(pdf_path.resolve()),
+            str(prefix_path),
+        ]
+        try:
+            completed = subprocess.run(
+                command,
+                check=False,
+                capture_output=True,
+                text=True,
+                timeout=timeout_s,
+            )
+        except subprocess.TimeoutExpired as exc:
+            raise RuntimeError(
+                "Poppler rasterization timed out after "
+                f"{timeout_s} seconds while rendering {pdf_path.name}; "
+                "increase conversion PDF render timeout or lower image DPI"
+            ) from exc
+        if completed.returncode != 0:
+            raise RuntimeError(
+                f"Poppler rasterization failed: {completed.stderr.strip() or completed.stdout.strip()}"
+            )
+        images = sorted(out_dir.glob(f"slide-*.{image_format}"))
+    else:
+        if total_pages < 0:
+            raise ValueError("total_pages must be zero or greater")
+        images = []
+        for page_index in range(1, total_pages + 1):
+            page_prefix = out_dir / f"slide-{page_index:04d}"
+            command = [
+                "pdftoppm",
+                "-r",
+                str(dpi),
+                f"-{image_format}",
+                "-f",
+                str(page_index),
+                "-l",
+                str(page_index),
+                "-singlefile",
+                str(pdf_path.resolve()),
+                str(page_prefix),
+            ]
+            try:
+                completed = subprocess.run(
+                    command,
+                    check=False,
+                    capture_output=True,
+                    text=True,
+                    timeout=timeout_s,
+                )
+            except subprocess.TimeoutExpired as exc:
+                raise RuntimeError(
+                    "Poppler rasterization timed out after "
+                    f"{timeout_s} seconds while rendering page {page_index} "
+                    f"of {pdf_path.name}; increase conversion PDF render timeout "
+                    "or lower image DPI"
+                ) from exc
+            if completed.returncode != 0:
+                raise RuntimeError(
+                    "Poppler rasterization failed on page "
+                    f"{page_index}: {completed.stderr.strip() or completed.stdout.strip()}"
+                )
+            image_path = page_prefix.with_suffix(f".{image_format}")
+            if not image_path.exists():
+                raise RuntimeError(
+                    f"Poppler did not create expected page image: {image_path}"
+                )
+            images.append(image_path.resolve())
+            if page_progress_callback is not None:
+                page_progress_callback(page_index, total_pages)
 
-    images = sorted(out_dir.glob(f"slide-*.{image_format}"))
     if not images:
         raise RuntimeError(f"no rendered images found in {out_dir}")
     return [image.resolve() for image in images]
@@ -180,6 +239,11 @@ def convert_pptx_to_slidedeck(
     image_format: str = "png",
     pptx_to_pdf_timeout_s: int = 180,
     pdf_to_images_timeout_s: int = 600,
+    pptx_to_pdf_base_timeout_s: int = 45,
+    pptx_to_pdf_per_slide_timeout_s: int = 3,
+    pdf_to_images_base_timeout_s: int = 30,
+    pdf_to_images_per_slide_timeout_s: int = 8,
+    progress_callback: ProgressCallback | None = None,
 ) -> SlideDeckResult:
     """Convert a PPTX into rendered images and extracted notes.
 
@@ -206,15 +270,45 @@ def convert_pptx_to_slidedeck(
     pdf_path = work_dir / f"{pptx_path.stem}.pdf"
     image_dir = work_dir / "slides"
 
-    convert_pptx_to_pdf(pptx_path, pdf_path, timeout_s=pptx_to_pdf_timeout_s)
+    _emit_progress(progress_callback, PHASE_EXTRACTING_NOTES, 0, 1)
+    notes = extract_slide_notes(pptx_path)
+    _emit_progress(progress_callback, PHASE_EXTRACTING_NOTES, 1, 1)
+    slide_count = len(notes)
+    pptx_to_pdf_timeout = _compute_adaptive_timeout(
+        slide_count=slide_count,
+        timeout_cap_s=pptx_to_pdf_timeout_s,
+        base_timeout_s=pptx_to_pdf_base_timeout_s,
+        per_slide_timeout_s=pptx_to_pdf_per_slide_timeout_s,
+    )
+    pdf_to_images_timeout = _compute_adaptive_timeout(
+        slide_count=slide_count,
+        timeout_cap_s=pdf_to_images_timeout_s,
+        base_timeout_s=pdf_to_images_base_timeout_s,
+        per_slide_timeout_s=pdf_to_images_per_slide_timeout_s,
+    )
+
+    _emit_progress(progress_callback, PHASE_PPTX_TO_PDF, 0, 1)
+    convert_pptx_to_pdf(pptx_path, pdf_path, timeout_s=pptx_to_pdf_timeout)
+    _emit_progress(progress_callback, PHASE_PPTX_TO_PDF, 1, 1)
+
+    _emit_progress(progress_callback, PHASE_PDF_TO_IMAGES, 0, slide_count)
     image_paths = render_pdf_to_images(
         pdf_path,
         image_dir,
         dpi=dpi,
         image_format=image_format,
-        timeout_s=pdf_to_images_timeout_s,
+        timeout_s=_compute_page_timeout(
+            total_timeout_s=pdf_to_images_timeout,
+            page_count=slide_count,
+        ),
+        total_pages=slide_count,
+        page_progress_callback=lambda current, max_pages: _emit_progress(
+            progress_callback,
+            PHASE_PDF_TO_IMAGES,
+            current,
+            max_pages,
+        ),
     )
-    notes = extract_slide_notes(pptx_path)
 
     if len(image_paths) != len(notes):
         raise ValueError(
@@ -229,6 +323,40 @@ def convert_pptx_to_slidedeck(
     return SlideDeckResult(source_filename=pptx_path.name, slides=slides)
 
 
+def _compute_adaptive_timeout(
+    *,
+    slide_count: int,
+    timeout_cap_s: int,
+    base_timeout_s: int,
+    per_slide_timeout_s: int,
+) -> int:
+    """Compute a bounded timeout that scales linearly with slide count."""
+    normalized_slides = max(1, slide_count)
+    adaptive_timeout = base_timeout_s + (normalized_slides * per_slide_timeout_s)
+    bounded_timeout = min(timeout_cap_s, adaptive_timeout)
+    return max(1, bounded_timeout)
+
+
+def _compute_page_timeout(*, total_timeout_s: int, page_count: int) -> int:
+    """Split total PDF raster timeout into a bounded per-page timeout."""
+    if page_count <= 0:
+        return max(1, total_timeout_s)
+    timeout = (total_timeout_s + page_count - 1) // page_count
+    return max(15, timeout)
+
+
+def _emit_progress(
+    progress_callback: ProgressCallback | None,
+    phase: str,
+    current_progress: int,
+    max_progress: int,
+) -> None:
+    """Emit phase/progress updates when a callback is configured."""
+    if progress_callback is None:
+        return
+    progress_callback(phase, current_progress, max_progress)
+
+
 def _extract_notes_text(shapes: Iterable[object]) -> str:
     """Extract plain text from note shapes while preserving paragraph breaks."""
     segments: list[str] = []
diff --git a/python/packages/server/src/officeconvert_server/config.py b/python/packages/server/src/officeconvert_server/config.py
index 6cc3cc1..5d4eb52 100644
--- a/python/packages/server/src/officeconvert_server/config.py
+++ b/python/packages/server/src/officeconvert_server/config.py
@@ -19,6 +19,10 @@ class ServerConfig:
     conversion_image_dpi: int
     conversion_pptx_to_pdf_timeout_seconds: int
     conversion_pdf_to_images_timeout_seconds: int
+    conversion_pptx_to_pdf_base_timeout_seconds: int
+    conversion_pptx_to_pdf_per_slide_timeout_seconds: int
+    conversion_pdf_to_images_base_timeout_seconds: int
+    conversion_pdf_to_images_per_slide_timeout_seconds: int
     conversion_cleanup_delay_seconds: int
 
 
@@ -31,13 +35,25 @@ def load_server_config() -> ServerConfig:
         s3_secure=os.getenv("S3_USE_SSL", "false").lower() == "true",
         s3_public_endpoint=os.getenv("S3_PUBLIC_ENDPOINT", "localhost:8333"),
         s3_session_ttl_seconds=int(os.getenv("S3_SESSION_TTL_SECONDS", "3600")),
-        conversion_image_dpi=int(os.getenv("CONVERSION_IMAGE_DPI", "150")),
+        conversion_image_dpi=int(os.getenv("CONVERSION_IMAGE_DPI", "72")),
         conversion_pptx_to_pdf_timeout_seconds=int(
             os.getenv("CONVERSION_PPTX_TO_PDF_TIMEOUT_SECONDS", "180")
         ),
         conversion_pdf_to_images_timeout_seconds=int(
             os.getenv("CONVERSION_PDF_TO_IMAGES_TIMEOUT_SECONDS", "600")
         ),
+        conversion_pptx_to_pdf_base_timeout_seconds=int(
+            os.getenv("CONVERSION_PPTX_TO_PDF_BASE_TIMEOUT_SECONDS", "45")
+        ),
+        conversion_pptx_to_pdf_per_slide_timeout_seconds=int(
+            os.getenv("CONVERSION_PPTX_TO_PDF_PER_SLIDE_TIMEOUT_SECONDS", "3")
+        ),
+        conversion_pdf_to_images_base_timeout_seconds=int(
+            os.getenv("CONVERSION_PDF_TO_IMAGES_BASE_TIMEOUT_SECONDS", "30")
+        ),
+        conversion_pdf_to_images_per_slide_timeout_seconds=int(
+            os.getenv("CONVERSION_PDF_TO_IMAGES_PER_SLIDE_TIMEOUT_SECONDS", "8")
+        ),
         conversion_cleanup_delay_seconds=int(
             os.getenv("CONVERSION_CLEANUP_DELAY_SECONDS", "3600")
         ),
diff --git a/python/packages/server/src/officeconvert_server/models.py b/python/packages/server/src/officeconvert_server/models.py
index e73b487..32b9946 100644
--- a/python/packages/server/src/officeconvert_server/models.py
+++ b/python/packages/server/src/officeconvert_server/models.py
@@ -22,6 +22,9 @@ class ConversionSession:
     bucket_name: str
     upload_object_key: str
     status: conversion_pb2.ConversionStatus
+    phase: conversion_pb2.ConversionPhase = conversion_pb2.CONVERSION_PHASE_INACTIVE
+    current_progress: int = 0
+    max_progress: int = 0
     created_at: datetime = field(default_factory=utc_now)
     updated_at: datetime = field(default_factory=utc_now)
     error_message: str = ""
diff --git a/python/packages/server/src/officeconvert_server/service.py b/python/packages/server/src/officeconvert_server/service.py
index ded2403..80b8fcb 100644
--- a/python/packages/server/src/officeconvert_server/service.py
+++ b/python/packages/server/src/officeconvert_server/service.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import asyncio
+from collections.abc import Callable
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
 import shutil
@@ -14,6 +15,11 @@ from connectrpc.errors import ConnectError
 from connectrpc.request import RequestContext
 from google.protobuf.timestamp_pb2 import Timestamp
 from officeconvert import SlideArtifact, convert_pptx_to_slidedeck
+from officeconvert.conversion import (
+    PHASE_EXTRACTING_NOTES,
+    PHASE_PDF_TO_IMAGES,
+    PHASE_PPTX_TO_PDF,
+)
 from officeconvertapi.v1 import conversion_connect, conversion_pb2
 
 from officeconvert_server.config import ServerConfig
@@ -98,6 +104,10 @@ class ConversionServiceImpl(conversion_connect.ConversionService):
                 )
 
             session.status = conversion_pb2.CONVERSION_STATUS_RUNNING
+            session.phase = conversion_pb2.CONVERSION_PHASE_INACTIVE
+            session.current_progress = 0
+            session.max_progress = 0
+            session.error_message = ""
             session.updated_at = utc_now()
             session.conversion_task = asyncio.create_task(self._run_conversion(session))
 
@@ -119,6 +129,9 @@ class ConversionServiceImpl(conversion_connect.ConversionService):
             status=session.status,
             error_message=session.error_message,
             updated_at=_to_timestamp(session.updated_at),
+            phase=session.phase,
+            current_progress=session.current_progress,
+            max_progress=session.max_progress,
         )
 
     async def get_slide_deck(
@@ -185,22 +198,47 @@ class ConversionServiceImpl(conversion_connect.ConversionService):
                 dpi=self._config.conversion_image_dpi,
                 pptx_to_pdf_timeout_s=self._config.conversion_pptx_to_pdf_timeout_seconds,
                 pdf_to_images_timeout_s=self._config.conversion_pdf_to_images_timeout_seconds,
+                pptx_to_pdf_base_timeout_s=self._config.conversion_pptx_to_pdf_base_timeout_seconds,
+                pptx_to_pdf_per_slide_timeout_s=self._config.conversion_pptx_to_pdf_per_slide_timeout_seconds,
+                pdf_to_images_base_timeout_s=self._config.conversion_pdf_to_images_base_timeout_seconds,
+                pdf_to_images_per_slide_timeout_s=self._config.conversion_pdf_to_images_per_slide_timeout_seconds,
+                progress_callback=lambda phase_name, current, max_value: self._set_session_progress_from_name(
+                    session,
+                    phase_name=phase_name,
+                    current_progress=current,
+                    max_progress=max_value,
+                ),
+            )
+            self._set_session_progress(
+                session,
+                phase=conversion_pb2.CONVERSION_PHASE_UPLOADING_RESULTS,
+                current_progress=0,
+                max_progress=len(result.slides),
             )
             session.slide_deck = await asyncio.to_thread(
                 self._upload_and_build_slide_deck,
                 session,
                 result.slides,
                 result.source_filename,
+                lambda current, max_value: self._set_session_progress(
+                    session,
+                    phase=conversion_pb2.CONVERSION_PHASE_UPLOADING_RESULTS,
+                    current_progress=current,
+                    max_progress=max_value,
+                ),
             )
             session.status = conversion_pb2.CONVERSION_STATUS_SUCCEEDED
+            session.phase = conversion_pb2.CONVERSION_PHASE_INACTIVE
             session.updated_at = utc_now()
         except asyncio.CancelledError:
             session.status = conversion_pb2.CONVERSION_STATUS_FAILED
+            session.phase = conversion_pb2.CONVERSION_PHASE_INACTIVE
             session.error_message = "conversion cancelled"
             session.updated_at = utc_now()
             raise
         except Exception as exc:
             session.status = conversion_pb2.CONVERSION_STATUS_FAILED
+            session.phase = conversion_pb2.CONVERSION_PHASE_INACTIVE
             session.error_message = str(exc)
             session.updated_at = utc_now()
         finally:
@@ -212,10 +250,12 @@ class ConversionServiceImpl(conversion_connect.ConversionService):
         session: ConversionSession,
         slides: list[SlideArtifact],
         source_filename: str,
+        progress_callback: Callable[[int, int], None] | None = None,
     ) -> conversion_pb2.SlideDeck:
         """Upload generated slide images and construct API response payload."""
         response_slides: list[conversion_pb2.Slide] = []
-        for slide in slides:
+        slide_total = len(slides)
+        for slide_index, slide in enumerate(slides, start=1):
             object_key = f"output/slide-{slide.index:04d}{slide.image_path.suffix}"
             self._store.fput_object(session.bucket_name, object_key, slide.image_path)
             image_url = self._store.presigned_get_url(
@@ -230,6 +270,8 @@ class ConversionServiceImpl(conversion_connect.ConversionService):
                     image_url=image_url,
                 )
             )
+            if progress_callback is not None:
+                progress_callback(slide_index, slide_total)
 
         return conversion_pb2.SlideDeck(
             conversion_id=session.conversion_id,
@@ -263,6 +305,45 @@ class ConversionServiceImpl(conversion_connect.ConversionService):
             raise ConnectError(Code.NOT_FOUND, "conversion_id not found")
         return session
 
+    def _set_session_progress_from_name(
+        self,
+        session: ConversionSession,
+        *,
+        phase_name: str,
+        current_progress: int,
+        max_progress: int,
+    ) -> None:
+        """Map conversion-library phase names onto API enum phases."""
+        phase_map = {
+            PHASE_EXTRACTING_NOTES: conversion_pb2.CONVERSION_PHASE_EXTRACTING_NOTES,
+            PHASE_PPTX_TO_PDF: conversion_pb2.CONVERSION_PHASE_PPTX_TO_PDF,
+            PHASE_PDF_TO_IMAGES: conversion_pb2.CONVERSION_PHASE_PDF_TO_IMAGES,
+        }
+        self._set_session_progress(
+            session,
+            phase=phase_map.get(phase_name, conversion_pb2.CONVERSION_PHASE_INACTIVE),
+            current_progress=current_progress,
+            max_progress=max_progress,
+        )
+
+    def _set_session_progress(
+        self,
+        session: ConversionSession,
+        *,
+        phase: conversion_pb2.ConversionPhase,
+        current_progress: int,
+        max_progress: int,
+    ) -> None:
+        """Set normalized phase/progress counters and touch update timestamp."""
+        normalized_max = max(0, max_progress)
+        normalized_current = max(0, current_progress)
+        if normalized_max > 0:
+            normalized_current = min(normalized_current, normalized_max)
+        session.phase = phase
+        session.current_progress = normalized_current
+        session.max_progress = normalized_max
+        session.updated_at = utc_now()
+
 
 def _to_timestamp(value: datetime) -> Timestamp:
     """Convert a timezone-aware datetime to protobuf Timestamp."""