diff --git a/data/pref.xml b/data/pref.xml
index 7c7d223a4..546464d09 100644
--- a/data/pref.xml
+++ b/data/pref.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Aseprite -->
-<!-- Copyright (C) 2018-2023  Igara Studio S.A. -->
+<!-- Copyright (C) 2018-2024  Igara Studio S.A. -->
 <!-- Copyright (C) 2014-2018  David Capello -->
 <preferences>
 
@@ -133,6 +133,10 @@
       <value id="BILINEAR_MIPMAP" value="2" />
       <value id="TRILINEAR_MIPMAP" value="3" />
     </enum>
+    <enum id="AlphaRange">
+      <value id="EIGHT_BIT" value="0" />
+      <value id="PERCENTAGE" value="1" />
+    </enum>
   </types>
 
   <global>
@@ -431,6 +435,10 @@
       <option id="window_profile" type="WindowColorProfile" default="WindowColorProfile::MONITOR" />
       <option id="window_profile_name" type="std::string" />
     </section>
+    <section id="range">
+      <option id="alpha" type="AlphaRange" default="AlphaRange::EIGHT_BIT" />
+      <option id="opacity" type="AlphaRange" default="AlphaRange::PERCENTAGE" />
+    </section>
     <section id="canvas_size">
       <option id="trim_outside" type="bool" default="false" />
     </section>
diff --git a/data/strings/en.ini b/data/strings/en.ini
index c72d2dc29..58dc672a7 100644
--- a/data/strings/en.ini
+++ b/data/strings/en.ini
@@ -1,5 +1,5 @@
 # Aseprite
-# Copyright (C) 2018-2023  Igara Studio S.A.
+# Copyright (C) 2018-2024  Igara Studio S.A.
 # Copyright (C) 2016-2018  David Capello
 #
 # This work is licensed under the Creative Commons Attribution 4.0
@@ -1469,6 +1469,11 @@ use_embedded_cs = Use embedded profile
 convert_cs = Convert to working RGB space
 assign_cs = Assign working RGB space
 ask_cs = Ask
+alpha_and_opacity = Alpha && Opacity
+alpha_range = Alpha Range:
+opacity_range = Opacity Range:
+8bit_value = 0-255
+percentage = 0%-100%
 available_themes = Available Themes
 extension_themes = Extension Themes
 select_theme = &Select
diff --git a/data/widgets/cel_properties.xml b/data/widgets/cel_properties.xml
index 3e61262bb..9f2d16800 100644
--- a/data/widgets/cel_properties.xml
+++ b/data/widgets/cel_properties.xml
@@ -1,5 +1,5 @@
 <!-- Aseprite -->
-<!-- Copyright (C) 2020-2023 by Igara Studio S.A. -->
+<!-- Copyright (C) 2020-2024 by Igara Studio S.A. -->
 <!-- Copyright (C) 2001-2016 by David Capello -->
 <gui>
 <window id="cel_properties" text="@.title">
diff --git a/data/widgets/options.xml b/data/widgets/options.xml
index 3e3a3c22f..58dfbde81 100644
--- a/data/widgets/options.xml
+++ b/data/widgets/options.xml
@@ -1,5 +1,5 @@
 <!-- Aseprite -->
-<!-- Copyright (C) 2018-2023  Igara Studio S.A. -->
+<!-- Copyright (C) 2018-2024  Igara Studio S.A. -->
 <!-- Copyright (C) 2001-2018  David Capello -->
 <gui>
   <window id="options" text="@.title">
@@ -192,7 +192,7 @@
           <separator text="@.section_color" horizontal="true" />
           <check text="@.color_management" id="color_management" pref="color.manage" />
 
-	  <grid columns="2">
+          <grid columns="2">
             <label text="@.window_cs" id="window_cs_label" />
             <combobox id="window_cs">
               <listitem text="@.use_monitor_cs" />
@@ -213,20 +213,34 @@
               <listitem text="@.convert_cs" />
               <listitem text="@.assign_cs" />
               <listitem text="@.ask_cs" />
-	    </combobox>
+            </combobox>
 
             <label text="@.missing_cs" id="missing_cs_label" />
             <combobox id="missing_cs">
               <listitem text="@.disable_cs" />
               <listitem text="@.assign_cs" />
               <listitem text="@.ask_cs" />
-	    </combobox>
-	  </grid>
+            </combobox>
+          </grid>
 
-	  <hbox>
-	    <hbox expansive="true" />
+          <hbox>
+            <hbox expansive="true" />
             <button id="reset_color_management" text="@general.reset" minwidth="60" />
-	  </hbox>
+          </hbox>
+
+          <separator text="@.alpha_and_opacity" horizontal="true" />
+          <grid columns="2">
+            <label text="@.alpha_range" id="alpha_range_label" />
+            <combobox id="alpha">
+              <listitem text="@.8bit_value" />
+              <listitem text="@.percentage" />
+            </combobox>
+            <label text="@.opacity_range" id="opacity_range_label" />
+            <combobox id="opacity">
+              <listitem text="@.8bit_value" />
+              <listitem text="@.percentage" />
+            </combobox>
+          </grid>
         </vbox>
 
         <!-- Editor -->
diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index 8efd9ff4f..ee42c8ab0 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -1,5 +1,5 @@
 # Aseprite
-# Copyright (C) 2018-2023  Igara Studio S.A.
+# Copyright (C) 2018-2024  Igara Studio S.A.
 # Copyright (C) 2001-2018  David Capello
 
 # Generate a ui::Widget for each widget in a XML file
diff --git a/src/app/commands/cmd_options.cpp b/src/app/commands/cmd_options.cpp
index d8f5d6117..19ea43383 100644
--- a/src/app/commands/cmd_options.cpp
+++ b/src/app/commands/cmd_options.cpp
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2018-2023  Igara Studio S.A.
+// Copyright (C) 2018-2024  Igara Studio S.A.
 // Copyright (C) 2001-2018  David Capello
 //
 // This program is distributed under the terms of
@@ -776,6 +776,9 @@ public:
     }
     update_windows_color_profile_from_preferences();
 
+    m_pref.range.alpha(static_cast<app::gen::AlphaRange>(alpha()->getSelectedItemIndex()));
+    m_pref.range.opacity(static_cast<app::gen::AlphaRange>(opacity()->getSelectedItemIndex()));
+
     // Change sprite grid bounds
     if (m_context &&
         m_context->activeDocument() &&
@@ -1073,6 +1076,9 @@ private:
     filesWithCs()->setEnabled(state);
     missingCsLabel()->setEnabled(state);
     missingCs()->setEnabled(state);
+
+    alpha()->setSelectedItemIndex(static_cast<int>(m_pref.range.alpha()));
+    opacity()->setSelectedItemIndex(static_cast<int>(m_pref.range.opacity()));
   }
 
   void onResetColorManagement() {
diff --git a/src/app/script/values.cpp b/src/app/script/values.cpp
index 10e019339..70c91d7e5 100644
--- a/src/app/script/values.cpp
+++ b/src/app/script/values.cpp
@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2019-2023  Igara Studio S.A.
+// Copyright (C) 2019-2024  Igara Studio S.A.
 //
 // This program is distributed under the terms of
 // the End-User License Agreement for Aseprite.
@@ -334,6 +334,7 @@ FOR_ENUM(app::gen::SymmetryMode)
 FOR_ENUM(app::gen::TimelinePosition)
 FOR_ENUM(app::gen::ToGrayAlgorithm)
 FOR_ENUM(app::gen::WindowColorProfile)
+FOR_ENUM(app::gen::AlphaRange)
 FOR_ENUM(app::tools::ColorFromTo)
 FOR_ENUM(app::tools::DynamicSensor)
 FOR_ENUM(app::tools::FreehandAlgorithm)