diff --git a/lua/Navigator/init.lua b/lua/Navigator/init.lua
index 4c87dd0..6794f84 100644
--- a/lua/Navigator/init.lua
+++ b/lua/Navigator/init.lua
@@ -122,4 +122,47 @@ function Nav.previous()
     n.navigate('p')
 end
 
+---Resize down split/pane
+---@usage [[
+---require('Navigator').size_down()
+---
+----- With keybinding
+---vim.keymap.set({'n', 't'}, '<A-j>', require('Navigator').size_down)
+---@usage ]]
+function Nav.size_down()
+    n.resize('j')
+end
+
+---Resize up split/pane
+---@usage [[
+---require('Navigator').size_up()
+---
+----- With keybinding
+---vim.keymap.set({'n', 't'}, '<A-k>', require('Navigator').size_up)
+---@usage ]]
+function Nav.size_up()
+    n.resize('k')
+end
+
+---Resize left split/pane
+---@usage [[
+---require('Navigator').size_left()
+---
+----- With keybinding
+---vim.keymap.set({'n', 't'}, '<A-h>', require('Navigator').size_left)
+---@usage ]]
+function Nav.size_left()
+    n.resize('h')
+end
+
+---Resize right split/pane
+---@usage [[
+---require('Navigator').size_right()
+---
+----- With keybinding
+---vim.keymap.set({'n', 't'}, '<A-l>', require('Navigator').size_right)
+---@usage ]]
+function Nav.size_right()
+    n.resize('l')
+end
 return Nav
diff --git a/lua/Navigator/mux/vi.lua b/lua/Navigator/mux/vi.lua
index 350e512..aeefd6f 100644
--- a/lua/Navigator/mux/vi.lua
+++ b/lua/Navigator/mux/vi.lua
@@ -32,4 +32,11 @@ function Vi:navigate(direction)
     return self
 end
 
+---Navigate inside neovim
+---@param direction Direction See |navigator.api.Direction|
+---@return Vi
+function Vi:size(direction)
+    cmd('resize ' .. direction)
+    return self
+end
 return Vi
diff --git a/lua/Navigator/mux/wezterm.lua b/lua/Navigator/mux/wezterm.lua
index 8afdcef..7ad2395 100644
--- a/lua/Navigator/mux/wezterm.lua
+++ b/lua/Navigator/mux/wezterm.lua
@@ -49,4 +49,12 @@ function WezTerm:navigate(direction)
     return self
 end
 
+---Resize pane in wezterm
+---@param direction Direction See |navigator.api.Direction|
+---@return WezTerm
+function WezTerm:size(direction)
+    self.execute(string.format('adjust-pane-size %s', self.direction[direction]))
+    return self
+end
+
 return WezTerm
diff --git a/lua/Navigator/navigate.lua b/lua/Navigator/navigate.lua
index 12af69b..08a71c3 100644
--- a/lua/Navigator/navigate.lua
+++ b/lua/Navigator/navigate.lua
@@ -99,4 +99,37 @@ function N.navigate(direction)
     end
 end
 
+---For smoothly resizing neovim splits and mux panes
+---@param direction string
+function N.resize(direction)
+    -- window id before navigation
+    local cur_win = A.nvim_get_current_win()
+
+    local mux_last_pane = N.last_pane
+    if not mux_last_pane then
+      if direction == 'h' then
+        cmd('vertical resize -8')
+      elseif direction == 'l' then
+        cmd('vertical resize +8')
+      elseif direction == 'k' then
+        cmd('resize -8')
+      elseif direction == 'j' then
+        cmd('resize +8')
+      end
+      -- If we only want to resize inside vim
+      -- then we don't need to do anything in mux
+      return
+    end
+
+    -- After navigation, if the old window and new window matches
+    local at_edge = cur_win == A.nvim_get_current_win()
+
+    -- then we can assume that we hit the edge
+    -- there is mux pane besided the edge
+    -- So we can navigate to the mux pane
+    if back_to_mux(at_edge) then
+      N.config.mux:size(direction)
+    end
+end
+
 return N
diff --git a/plugin/Navigator.lua b/plugin/Navigator.lua
index 54a37df..2e5c7e1 100644
--- a/plugin/Navigator.lua
+++ b/plugin/Navigator.lua
@@ -7,3 +7,8 @@ ucmd('NavigatorRight', N.right, {})
 ucmd('NavigatorUp', N.up, {})
 ucmd('NavigatorDown', N.down, {})
 ucmd('NavigatorPrevious', N.previous, {})
+
+ucmd('NavigatorSizeLeft', N.size_left, {})
+ucmd('NavigatorSizeRight', N.size_right, {})
+ucmd('NavigatorSizeUp', N.size_up, {})
+ucmd('NavigatorSizeDown', N.size_down, {})