diff --git a/modules/config.py b/modules/config.py
index c7af33db..35077cda 100644
--- a/modules/config.py
+++ b/modules/config.py
@@ -248,6 +248,11 @@ default_max_image_number = get_config_item_or_set_default(
     default_value=32,
     validator=lambda x: isinstance(x, int) and x >= 1
 )
+default_image_extension = get_config_item_or_set_default(
+    key='default_image_extension',
+    default_value='png',
+    validator=lambda x: x in modules.flags.image_extensions
+)
 default_image_number = get_config_item_or_set_default(
     key='default_image_number',
     default_value=2,
@@ -330,6 +335,7 @@ possible_preset_keys = [
     "default_sampler",
     "default_scheduler",
     "default_performance",
+    "default_image_extension",
     "default_prompt",
     "default_prompt_negative",
     "default_styles",
diff --git a/modules/flags.py b/modules/flags.py
index 27f2d716..4e5a174c 100644
--- a/modules/flags.py
+++ b/modules/flags.py
@@ -34,6 +34,7 @@ default_parameters = {
 
 inpaint_engine_versions = ['None', 'v1', 'v2.5', 'v2.6']
 performance_selections = ['Speed', 'Quality', 'Extreme Speed']
+image_extensions = ['png', 'jpg']
 
 inpaint_option_default = 'Inpaint or Outpaint (default)'
 inpaint_option_detail = 'Improve Detail (face, hand, eyes, etc.)'
diff --git a/modules/private_logger.py b/modules/private_logger.py
index 968bd4f5..1417b0b6 100644
--- a/modules/private_logger.py
+++ b/modules/private_logger.py
@@ -13,7 +13,7 @@ log_cache = {}
 
 def get_current_html_path():
     date_string, local_temp_filename, only_name = generate_temp_filename(folder=modules.config.path_outputs,
-                                                                         extension='png')
+                                                                         extension=modules.config.default_image_extension)
     html_name = os.path.join(os.path.dirname(local_temp_filename), 'log.html')
     return html_name
 
@@ -22,7 +22,7 @@ def log(img, dic):
     if args_manager.args.disable_image_log:
         return
 
-    date_string, local_temp_filename, only_name = generate_temp_filename(folder=modules.config.path_outputs, extension='png')
+    date_string, local_temp_filename, only_name = generate_temp_filename(folder=modules.config.path_outputs, extension=modules.config.default_image_extension)
     os.makedirs(os.path.dirname(local_temp_filename), exist_ok=True)
     Image.fromarray(img).save(local_temp_filename)
     html_name = os.path.join(os.path.dirname(local_temp_filename), 'log.html')
diff --git a/webui.py b/webui.py
index 581e3101..d21cd557 100644
--- a/webui.py
+++ b/webui.py
@@ -230,6 +230,9 @@ with shared.gradio_root:
                                                    value=modules.config.default_aspect_ratio, info='width × height',
                                                    elem_classes='aspect_ratios')
                 image_number = gr.Slider(label='Image Number', minimum=1, maximum=modules.config.default_max_image_number, step=1, value=modules.config.default_image_number)
+                image_extension = gr.Radio(label='Image Extension',
+                                                 choices=modules.flags.image_extensions,
+                                                 value=modules.config.default_image_extension)
                 negative_prompt = gr.Textbox(label='Negative Prompt', show_label=True, placeholder="Type prompt here.",
                                              info='Describing what you do not want to see.', lines=2,
                                              elem_id='negative_prompt',
@@ -481,7 +484,15 @@ with shared.gradio_root:
                                          adm_scaler_negative, refiner_switch, refiner_model, sampler_name,
                                          scheduler_name, adaptive_cfg, refiner_swap_method, negative_prompt
                                      ], queue=False, show_progress=False)
+        
+        def update_image_extension(value):
+            print(f'this is x: {value}\nthis is config: {modules.config.default_image_extension}')
+            modules.config.default_image_extension = value
+            print(f'updated config value: {modules.config.default_image_extension}')
 
+        image_extension.input(lambda x: update_image_extension(x), 
+                              inputs=image_extension)
+                              
         advanced_checkbox.change(lambda x: gr.update(visible=x), advanced_checkbox, advanced_column,
                                  queue=False, show_progress=False) \
             .then(fn=lambda: None, _js='refresh_grid_delayed', queue=False, show_progress=False)