diff --git a/configs/config_all.yaml b/configs/config_all.yaml
index 708db5c22..25e518f2a 100644
--- a/configs/config_all.yaml
+++ b/configs/config_all.yaml
@@ -120,6 +120,10 @@ process:
       min_ratio: 0.333                                        # the min aspect ratio of filter range
       max_ratio: 3.0                                          # the max aspect ratio of filter range
       any_or_all: any                                         # keep this sample when any/all images meet the filter condition
+  - image_size_filter:                                      # filter samples according to the size of images (in bytes) within them
+      min_size:  "0"                                            # the min size of filter range
+      max_ratio: "1TB"                                          # the max size of filter range
+      any_or_all: any                                           # keep this sample when any/all images meet the filter condition
   - language_id_score_filter:                               # filter text in specific language with language scores larger than a specific max value
       lang: en                                                # keep text in what language
       min_score: 0.8                                          # the min language scores to filter text
diff --git a/data_juicer/ops/filter/image_size_filter.py b/data_juicer/ops/filter/image_size_filter.py
index e5fd9455e..79e513ee3 100644
--- a/data_juicer/ops/filter/image_size_filter.py
+++ b/data_juicer/ops/filter/image_size_filter.py
@@ -16,7 +16,7 @@ class ImageSizeFilter(Filter):
 
     def __init__(self,
                  min_size: str = '0',
-                 max_size: str = '1Tb',
+                 max_size: str = '1TB',
                  any_or_all: str = 'any',
                  *args,
                  **kwargs):
@@ -35,8 +35,8 @@ def __init__(self,
         :param kwargs: extra args
         """
         super().__init__(*args, **kwargs)
-        self.min_size = min_size
-        self.max_size = max_size
+        self.min_size = size_to_bytes(min_size)
+        self.max_size = size_to_bytes(max_size)
         if any_or_all not in ['any', 'all']:
             raise ValueError(f'Keep strategy [{any_or_all}] is not supported. '
                              f'Can only be one of ["any", "all"].')
@@ -63,8 +63,8 @@ def compute_stats(self, sample, context=False):
     def process(self, sample):
         image_sizes = sample[Fields.stats][StatsKeys.image_sizes]
         keep_bools = np.array([
-            size_to_bytes(self.min_size) <= image_size <= size_to_bytes(
-                self.max_size) for image_size in image_sizes
+            self.min_size <= image_size <= self.max_size
+            for image_size in image_sizes
         ])
         if len(keep_bools) <= 0:
             return True
diff --git a/data_juicer/utils/mm_utils.py b/data_juicer/utils/mm_utils.py
index 0bcf8590e..ea6b2063f 100644
--- a/data_juicer/utils/mm_utils.py
+++ b/data_juicer/utils/mm_utils.py
@@ -63,4 +63,5 @@ def size_to_bytes(size):
     else:
         raise ValueError(f'You specified unidentifiable unit: {suffix}, '
                          f'expected in [KB, MB, GB, TB, PB, EB, ZB, YB, '
-                         f'KiB, MiB, GiB, TiB, PiB, EiB, ZiB, YiB]')
+                         f'KiB, MiB, GiB, TiB, PiB, EiB, ZiB, YiB], '
+                         f'(case insensitive, counted by *Bytes*).')