diff --git a/turbo_alignment/pipelines/preprocessing/multimodal.py b/turbo_alignment/pipelines/preprocessing/multimodal.py
index 4d98caa..c9af204 100644
--- a/turbo_alignment/pipelines/preprocessing/multimodal.py
+++ b/turbo_alignment/pipelines/preprocessing/multimodal.py
@@ -2,6 +2,7 @@
 from pathlib import Path
 from typing import Tuple
 
+import h5py
 import numpy as np
 import torch
 from accelerate import Accelerator
@@ -29,6 +30,50 @@
 
 
 class PreprocessMultimodalDatasetStrategy(BaseStrategy):
+    def run(self, experiment_settings: MultimodalDatasetProcessingSettings) -> None:
+        logger.info(f'👩 Start dataset processing with the following settings:\n{experiment_settings}')
+        accelerator = Accelerator()
+
+        reader, encoder = self._load_modality_reader_encoder(
+            experiment_settings.reader_settings,
+            experiment_settings.encoder_settings,
+            experiment_settings.modality,
+            accelerator,
+        )
+        self._read_modality_objects(reader, encoder, experiment_settings, accelerator)
+
+        logger.info(f'👩 Saved!')
+
+    def _process_function(self, reader, encoder, batch_file_paths, experiment_settings, batch_idx, accelerator):
+        modality_objects = []
+        for file_path in batch_file_paths:
+            modality_objects.append(reader.read(str(file_path)))
+        modality_objects = torch.cat(modality_objects)
+        encoded_modality_objects = encoder.encode(modality_objects.to(accelerator.device)).detach().cpu()
+        safetensors_dict_batch = self._get_safetensor_dict(encoded_modality_objects, batch_file_paths)
+
+        return safetensors_dict_batch
+
+    def _async_process_files(self, reader, encoder, files_paths, experiment_settings, accelerator):
+        output_file_name = experiment_settings.output_file_path / (
+            experiment_settings.modality.value
+            + '.'
+            + experiment_settings.encoder_settings.modality_encoder_type
+            + '.h5'
+        )
+
+        batches = np.array_split(files_paths, len(files_paths) // experiment_settings.batch_size)
+
+        for i, batch in enumerate(tqdm(batches)):
+            try:
+                logger.info(f'📖 Processing batch {i} / {len(batches)}')
+                batch_output = self._process_function(reader, encoder, batch, experiment_settings, i, accelerator)
+                with h5py.File(output_file_name, 'a') as f:
+                    for path, encoded_output in batch_output.items():
+                        f.create_dataset(path, data=encoded_output.numpy())
+            except Exception as exc:
+                logger.error(f'Error reading file: {exc}')
+
     @staticmethod
     def _load_modality_reader_encoder(
         reader_settings: ModalityReaderSettings,
@@ -55,69 +100,15 @@ def _read_modality_objects(self, reader, encoder, experiment_settings, accelerat
         for extension in available_extensions:
             files_paths.extend(experiment_settings.dataset_path.glob(f'*.{extension}'))
 
-        safetensors_full_dict = self._async_process_files(
-            reader, encoder, files_paths, experiment_settings, accelerator
-        )
-        return safetensors_full_dict
+        self._async_process_files(reader, encoder, files_paths, experiment_settings, accelerator)
 
     @staticmethod
     def _build_encoder_config(encoder) -> dict:
         return {'emb_dim': encoder.emb_dim}
 
-    def _process_function(self, reader, encoder, batch_file_paths, experiment_settings, batch_idx, accelerator):
-        logger.info(f'📖 Processing batch {batch_idx}')
-        modality_objects = []
-        for file_path in batch_file_paths:
-            modality_objects.append(reader.read(str(file_path)))
-        modality_objects = torch.cat(modality_objects)
-        encoded_modality_objects = encoder.encode(modality_objects.to(accelerator.device)).detach().cpu()
-        safetensors_dict_batch = self._get_safetensor_dict(encoded_modality_objects, batch_file_paths)
-
-        return safetensors_dict_batch
-
-    def _async_process_files(self, reader, encoder, files_paths, experiment_settings, accelerator):
-        modality_tensors = [None] * len(files_paths)
-
-        print(experiment_settings.batch_size, len(files_paths))
-        batches = np.array_split(files_paths, len(files_paths) // experiment_settings.batch_size)
-
-        safetensors_full_dict = {}
-        for i, batch in enumerate(tqdm(batches)):
-            try:
-                batch_output = self._process_function(reader, encoder, batch, experiment_settings, i, accelerator)
-                safetensors_full_dict.update(batch_output)
-            except Exception as exc:
-                logger.error(f'Error reading file: {exc}')
-        return safetensors_full_dict
-
     @staticmethod
     def _get_safetensor_dict(encoded_modality_tensors, encoded_file_paths):
         tensors = {}
         for file, tensor in zip(encoded_file_paths, encoded_modality_tensors):
             tensors[file.name] = tensor.detach()
         return tensors
-
-    def run(self, experiment_settings: MultimodalDatasetProcessingSettings) -> None:
-        logger.info(f'👩 Start dataset processing with the following settings:\n{experiment_settings}')
-        accelerator = Accelerator()
-
-        reader, encoder = self._load_modality_reader_encoder(
-            experiment_settings.reader_settings,
-            experiment_settings.encoder_settings,
-            experiment_settings.modality,
-            accelerator,
-        )
-        safetensors_full_dict = self._read_modality_objects(reader, encoder, experiment_settings, accelerator)
-
-        logger.info(f'👩 Saving safetensors file...')
-        save_file(
-            safetensors_full_dict,
-            experiment_settings.output_file_path
-            / (
-                experiment_settings.modality.value
-                + '.'
-                + experiment_settings.encoder_settings.modality_encoder_type
-                + '.safetensors'
-            ),
-        )
-        logger.info(f'👩 Saved!')