NPC Hitbox Expander

--// Source Code If u Want To Modify

local Players = game:GetService("Players")
local lp = Players.LocalPlayer
local camera = workspace.CurrentCamera

-- Create GUI
local gui = Instance.new("ScreenGui", lp:WaitForChild("PlayerGui"))
gui.Name = "NPCHitboxExpanderGUI"
gui.ResetOnSpawn = false

local frame = Instance.new("Frame", gui)
frame.Name = "MainFrame"
frame.Size = UDim2.new(0, 250, 0, 220)
frame.Position = UDim2.new(0, 20, 0.3, 0)
frame.BackgroundColor3 = Color3.fromRGB(20, 20, 20)
frame.BackgroundTransparency = 0.4
frame.BorderSizePixel = 0
frame.Active = true
frame.Draggable = true

local title = Instance.new("TextLabel", frame)
title.Size = UDim2.new(1, -40, 0, 30)
title.Position = UDim2.new(0, 10, 0, 5)
title.BackgroundTransparency = 1
title.Text = "NPC Hitbox Expander"
title.Font = Enum.Font.GothamBold
title.TextSize = 16
title.TextColor3 = Color3.new(1,1,1)
title.TextXAlignment = Enum.TextXAlignment.Left

local minimizeBtn = Instance.new("TextButton", frame)
minimizeBtn.Size = UDim2.new(0, 30, 0, 30)
minimizeBtn.Position = UDim2.new(1, -35, 0, 5)
minimizeBtn.Text = "-"
minimizeBtn.Font = Enum.Font.Gotham
minimizeBtn.TextSize = 18
minimizeBtn.BackgroundColor3 = Color3.fromRGB(40, 40, 40)
minimizeBtn.TextColor3 = Color3.new(1,1,1)
minimizeBtn.BorderSizePixel = 0

local toggle = Instance.new("TextButton", frame)
toggle.Size = UDim2.new(0, 230, 0, 30)
toggle.Position = UDim2.new(0, 10, 0, 45)
toggle.Text = "Hitbox: OFF"
toggle.Font = Enum.Font.Gotham
toggle.TextSize = 14
toggle.BackgroundColor3 = Color3.fromRGB(40, 40, 40)
toggle.TextColor3 = Color3.new(1,1,1)
toggle.BorderSizePixel = 0

local partSelector = Instance.new("TextButton", frame)
partSelector.Size = UDim2.new(0, 230, 0, 30)
partSelector.Position = UDim2.new(0, 10, 0, 85)
partSelector.Text = "Part: Head"
partSelector.Font = Enum.Font.Gotham
partSelector.TextSize = 14
partSelector.BackgroundColor3 = Color3.fromRGB(40, 40, 40)
partSelector.TextColor3 = Color3.new(1,1,1)
partSelector.BorderSizePixel = 0

local sizeBox = Instance.new("TextBox", frame)
sizeBox.Size = UDim2.new(0, 230, 0, 30)
sizeBox.Position = UDim2.new(0, 10, 0, 125)
sizeBox.PlaceholderText = "Hitbox Size (default = 7)"
sizeBox.Text = ""
sizeBox.Font = Enum.Font.Gotham
sizeBox.TextSize = 14
sizeBox.BackgroundColor3 = Color3.fromRGB(40, 40, 40)
sizeBox.TextColor3 = Color3.new(1,1,1)
sizeBox.BorderSizePixel = 0
sizeBox.ClearTextOnFocus = false

local minimized = false
minimizeBtn.MouseButton1Click:Connect(function()
	minimized = not minimized
	for _, child in ipairs(frame:GetChildren()) do
		if child:IsA("GuiObject") and child ~= title and child ~= minimizeBtn then
			child.Visible = not minimized
		end
	end
	minimizeBtn.Text = minimized and "+" or "-"
	frame.Size = minimized and UDim2.new(0, 250, 0, 40) or UDim2.new(0, 250, 0, 220)
end)

-- Hitbox Logic
local toggled = false
local partName = "Head"

function isNPC(char)
	return char and char:FindFirstChild("Humanoid") and not Players:GetPlayerFromCharacter(char)
end

function applyHitbox(npc, size)
	local part = npc:FindFirstChild(partName)
	if part and part:IsA("BasePart") then
		part.Size = Vector3.new(size, size, size)
		part.Material = Enum.Material.ForceField
		part.Transparency = 0.4
		part.Color = Color3.fromRGB(255, 0, 0)
		part.CanCollide = false
	end
end

function resetHitbox(npc)
	local part = npc:FindFirstChild(partName)
	if part and part:IsA("BasePart") then
		part.Size = Vector3.new(1, 1, 1)
		part.Material = Enum.Material.Plastic
		part.Transparency = 0
	end
end

local npcConnections = {}

toggle.MouseButton1Click:Connect(function()
	toggled = not toggled
	toggle.Text = toggled and "Hitbox: ON" or "Hitbox: OFF"

	if toggled then
		local size = tonumber(sizeBox.Text) or 7
		for _, model in pairs(workspace:GetDescendants()) do
			if model:IsA("Model") and isNPC(model) then
				applyHitbox(model, size)
			end
		end

		npcConnections["childAdded"] = workspace.DescendantAdded:Connect(function(obj)
			if obj:IsA("Model") and isNPC(obj) then
				task.wait(0.2)
				applyHitbox(obj, tonumber(sizeBox.Text) or 7)
			end
		end)
	else
		for _, model in pairs(workspace:GetDescendants()) do
			if model:IsA("Model") and isNPC(model) then
				resetHitbox(model)
			end
		end
		if npcConnections["childAdded"] then
			npcConnections["childAdded"]:Disconnect()
		end
	end
end)

partSelector.MouseButton1Click:Connect(function()
	partName = (partName == "Head") and "Torso" or "Head"
	partSelector.Text = "Part: " .. partName
end)