diff --git a/src/main/java/com/ldtteam/structurize/client/gui/WindowReplaceBlock.java b/src/main/java/com/ldtteam/structurize/client/gui/WindowReplaceBlock.java
index c7cd60111..0ab3f826a 100644
--- a/src/main/java/com/ldtteam/structurize/client/gui/WindowReplaceBlock.java
+++ b/src/main/java/com/ldtteam/structurize/client/gui/WindowReplaceBlock.java
@@ -5,6 +5,7 @@
 import com.ldtteam.structurize.Network;
 import com.ldtteam.structurize.api.util.ItemStackUtils;
 import com.ldtteam.structurize.blocks.ModBlocks;
+import com.ldtteam.structurize.client.gui.util.InputFilters;
 import com.ldtteam.structurize.client.gui.util.ItemPositionsStorage;
 import com.ldtteam.structurize.client.gui.util.ItemUtil;
 import com.ldtteam.structurize.network.messages.ReplaceBlockMessage;
@@ -51,6 +52,7 @@ public WindowReplaceBlock(
             Component.translatable("com.ldtteam.structurize.gui.scan.replace.pct"));
         this.toReplace = toReplace;
         findPaneOfTypeByID("count", TextField.class).setText("100");
+        findPaneOfTypeByID(COUNT, TextField.class).setFilter(InputFilters.PERCENT);
     }
 
     @Override
diff --git a/src/main/java/com/ldtteam/structurize/client/gui/WindowSelectRes.java b/src/main/java/com/ldtteam/structurize/client/gui/WindowSelectRes.java
index e76d82b32..2b64e63c8 100644
--- a/src/main/java/com/ldtteam/structurize/client/gui/WindowSelectRes.java
+++ b/src/main/java/com/ldtteam/structurize/client/gui/WindowSelectRes.java
@@ -187,7 +187,7 @@ public WindowSelectRes(
         if (this.selectCountText != null)
         {
             countField.setVisible(true);
-            countField.setFilter(InputFilters.ONLY_POSITIVE_NUMBERS);
+            countField.setFilter(InputFilters.ONLY_POSITIVE_NUMBERS_MAX1k);
             countText.setVisible(true);
             countText.setText(selectCountText);
         }
diff --git a/src/main/java/com/ldtteam/structurize/client/gui/util/InputFilters.java b/src/main/java/com/ldtteam/structurize/client/gui/util/InputFilters.java
index dc381c382..22394d53e 100644
--- a/src/main/java/com/ldtteam/structurize/client/gui/util/InputFilters.java
+++ b/src/main/java/com/ldtteam/structurize/client/gui/util/InputFilters.java
@@ -19,7 +19,7 @@ public boolean isAllowedCharacter(final char c)
         }
     };
 
-    public static TextField.Filter ONLY_POSITIVE_NUMBERS = new TextField.Filter()
+    public static TextField.Filter ONLY_POSITIVE_NUMBERS_MAX1k = new TextField.Filter()
     {
         @Override
         public String filter(final String s)
@@ -29,7 +29,12 @@ public String filter(final String s)
                 int i = Integer.parseInt(s);
                 if (i > 0)
                 {
-                    return s;
+                    if (i > 999)
+                    {
+                        i = 999;
+                    }
+
+                    return String.valueOf(i);
                 }
             }
             catch (Exception ignored)
@@ -44,4 +49,35 @@ public boolean isAllowedCharacter(final char c)
             return Character.isDigit(c);
         }
     };
+
+    public static TextField.Filter PERCENT = new TextField.Filter()
+    {
+        @Override
+        public String filter(final String s)
+        {
+            try
+            {
+                int i = Integer.parseInt(s);
+                if (i >= 0)
+                {
+                    if (i > 100)
+                    {
+                        i = 100;
+                    }
+
+                    return String.valueOf(i);
+                }
+            }
+            catch (Exception ignored)
+            {
+            }
+            return "0";
+        }
+
+        @Override
+        public boolean isAllowedCharacter(final char c)
+        {
+            return Character.isDigit(c);
+        }
+    };
 }