diff --git a/pkg/ui/keys.go b/pkg/ui/keys.go
index bad9e15..c629168 100644
--- a/pkg/ui/keys.go
+++ b/pkg/ui/keys.go
@@ -33,6 +33,8 @@ type KeyMap struct {
 	ToggleHelp            key.Binding
 	ToggleMessage         key.Binding
 	ToggleSelection       key.Binding
+	IncreaseFileTreeWidth key.Binding
+	DecreaseFileTreeWidth key.Binding
 }
 
 var keys = &KeyMap{
@@ -156,6 +158,14 @@ var keys = &KeyMap{
 		key.WithKeys("v"),
 		key.WithHelp("v", "toggle selection"),
 	),
+	IncreaseFileTreeWidth: key.NewBinding(
+		key.WithKeys(">"),
+		key.WithHelp(">", "increase file tree width"),
+	),
+	DecreaseFileTreeWidth: key.NewBinding(
+		key.WithKeys("<"),
+		key.WithHelp("<", "decrease file tree width"),
+	),
 }
 
 func KeyGroups() [][]key.Binding {
@@ -171,6 +181,8 @@ func KeyGroups() [][]key.Binding {
 		keys.CtrlU,
 		keys.ScrollLeft,
 		keys.ScrollRight,
+		keys.IncreaseFileTreeWidth,
+		keys.DecreaseFileTreeWidth,
 	}, {
 		keys.ToggleFileTree,
 		keys.SearchFiles,
diff --git a/pkg/ui/panes/filetree/filetree.go b/pkg/ui/panes/filetree/filetree.go
index ce6e2f9..a240f69 100644
--- a/pkg/ui/panes/filetree/filetree.go
+++ b/pkg/ui/panes/filetree/filetree.go
@@ -21,10 +21,15 @@ import (
 	"github.com/dlvhdr/diffnav/pkg/utils"
 )
 
+const (
+	widthStep = 5
+)
+
 type Model struct {
-	t     tree.Model
-	files []*gitdiff.File
-	cfg   config.Config
+	t            tree.Model
+	files        []*gitdiff.File
+	cfg          config.Config
+	currentWidth int
 }
 
 func New(cfg config.Config) Model {
@@ -59,6 +64,12 @@ func (m *Model) Update(msg tea.Msg) (*Model, tea.Cmd) {
 
 		case key.Matches(msg, keys.ToggleNode):
 			m.t.ToggleCurrentNode()
+
+		case key.Matches(msg, keys.IncreaseFileTreeWidth):
+			m.SetSize(m.Width()+widthStep, 0)
+
+		case key.Matches(msg, keys.DecreaseFileTreeWidth):
+			m.SetSize(m.Width()-widthStep, 0)
 		}
 	}
 	return m, nil
@@ -411,8 +422,10 @@ var indenter = func(children ltree.Children, index int) string {
 
 // SetSize implements the Component interface.
 func (m *Model) SetSize(width, height int) {
-	m.t.SetSize(width, height)
-	m.rebuildTree()
+	if width > 0 {
+		m.t.SetSize(width, height)
+		m.rebuildTree()
+	}
 }
 
 func (m *Model) Width() int {
diff --git a/pkg/ui/panes/filetree/keys.go b/pkg/ui/panes/filetree/keys.go
index f7a171f..f6ee3d1 100644
--- a/pkg/ui/panes/filetree/keys.go
+++ b/pkg/ui/panes/filetree/keys.go
@@ -3,9 +3,11 @@ package filetree
 import "charm.land/bubbles/v2/key"
 
 type KeyMap struct {
-	ExpandNode   key.Binding
-	CollapseNode key.Binding
-	ToggleNode   key.Binding
+	ExpandNode            key.Binding
+	CollapseNode          key.Binding
+	ToggleNode            key.Binding
+	IncreaseFileTreeWidth key.Binding
+	DecreaseFileTreeWidth key.Binding
 }
 
 var keys = &KeyMap{
@@ -21,4 +23,12 @@ var keys = &KeyMap{
 		key.WithKeys("enter"),
 		key.WithHelp("enter", "toggle"),
 	),
+	IncreaseFileTreeWidth: key.NewBinding(
+		key.WithKeys(">"),
+		key.WithHelp(">", "increase file tree width"),
+	),
+	DecreaseFileTreeWidth: key.NewBinding(
+		key.WithKeys("<"),
+		key.WithHelp("<", "decrease file tree width"),
+	),
 }