diff --git a/pkg/ui/keys.go b/pkg/ui/keys.go
index 32bb9be..0969e75 100644
--- a/pkg/ui/keys.go
+++ b/pkg/ui/keys.go
@@ -14,6 +14,8 @@ type KeyMap struct {
 	PrevFile        key.Binding
 	CtrlD           key.Binding
 	CtrlU           key.Binding
+	ScrollLeft      key.Binding
+	ScrollRight     key.Binding
 	ToggleFileTree  key.Binding
 	Search          key.Binding
 	Quit            key.Binding
@@ -71,6 +73,14 @@ var keys = &KeyMap{
 		key.WithKeys("ctrl+u"),
 		key.WithHelp("ctrl+u", "diff up"),
 	),
+	ScrollLeft: key.NewBinding(
+		key.WithKeys("left"),
+		key.WithHelp("←", "scroll left"),
+	),
+	ScrollRight: key.NewBinding(
+		key.WithKeys("right"),
+		key.WithHelp("→", "scroll right"),
+	),
 	ToggleFileTree: key.NewBinding(
 		key.WithKeys("e"),
 		key.WithHelp("e", "toggle file tree"),
@@ -124,6 +134,8 @@ func KeyGroups() [][]key.Binding {
 		keys.PrevFile,
 		keys.CtrlD,
 		keys.CtrlU,
+		keys.ScrollLeft,
+		keys.ScrollRight,
 	}, {
 		keys.ToggleFileTree,
 		keys.Search,
diff --git a/pkg/ui/panes/diffviewer/diffviewer.go b/pkg/ui/panes/diffviewer/diffviewer.go
index c69c7bf..f7638a8 100644
--- a/pkg/ui/panes/diffviewer/diffviewer.go
+++ b/pkg/ui/panes/diffviewer/diffviewer.go
@@ -10,7 +10,6 @@ import (
 	tea "charm.land/bubbletea/v2"
 	"charm.land/lipgloss/v2"
 	"github.com/bluekeyes/go-gitdiff/gitdiff"
-	"github.com/charmbracelet/x/ansi"
 
 	"github.com/dlvhdr/diffnav/pkg/filenode"
 	"github.com/dlvhdr/diffnav/pkg/icons"
@@ -80,18 +79,10 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 		}
 
 	case diffContentMsg:
-		// Truncate lines to viewport width to prevent ANSI escape overflow.
-		lines := strings.Split(msg.text, "\n")
-		for i, line := range lines {
-			if lipgloss.Width(line) > m.vp.Width() && m.vp.Width() > 0 {
-				lines[i] = ansi.Truncate(line, m.vp.Width(), "")
-			}
-		}
-		diff := strings.Join(lines, "\n")
 		if _, ok := m.cache[msg.cacheKey]; ok {
-			m.cache[msg.cacheKey].diff = diff
+			m.cache[msg.cacheKey].diff = msg.text
 		}
-		m.vp.SetContent(diff)
+		m.vp.SetContent(msg.text)
 	}
 
 	return m, tea.Batch(cmds...)
@@ -291,6 +282,16 @@ func (m *Model) ScrollTop() {
 	m.vp.GotoTop()
 }
 
+// ScrollLeft scrolls the viewport one column toward column 0.
+func (m *Model) ScrollLeft() {
+	m.vp.ScrollLeft(1)
+}
+
+// ScrollRight scrolls the viewport one column away from column 0.
+func (m *Model) ScrollRight() {
+	m.vp.ScrollRight(1)
+}
+
 func diffFile(node *cachedNode, width int, sideBySide bool) tea.Cmd {
 	if width == 0 || node == nil || len(node.files) != 1 {
 		return nil
@@ -304,7 +305,14 @@ func diffFile(node *cachedNode, width int, sideBySide bool) tea.Cmd {
 		args := []string{
 			"--paging=never",
 			fmt.Sprintf("-w=%d", width),
-			fmt.Sprintf("--max-line-length=%d", width),
+			// Disable hard truncation and let delta's own line-wrapping (active
+			// in side-by-side mode) carry the full line through. With
+			// `--max-line-length=<width>` and the default `--wrap-max-lines=2`,
+			// long lines were being clipped at the viewport before we saw
+			// them. Anything still wider than the viewport gets clipped with
+			// a visible "…" marker in the `diffContentMsg` handler.
+			"--max-line-length=0",
+			"--wrap-max-lines=unlimited",
 		}
 		if useSideBySide {
 			args = append(args, "--side-by-side")
@@ -340,7 +348,9 @@ func diffDir(dir *cachedNode, width int, sideBySide bool, preamble string) tea.C
 			fmt.Sprintf("--file-style='%s bold %s'", c, c),
 			fmt.Sprintf("--file-decoration-style='%s box %s'", c, c),
 			fmt.Sprintf("-w=%d", width),
-			fmt.Sprintf("--max-line-length=%d", width),
+			// See `diffFile` for why these are set this way.
+			"--max-line-length=0",
+			"--wrap-max-lines=unlimited",
 		}
 		if useSideBySide {
 			args = append(args, "--side-by-side")
diff --git a/pkg/ui/tui.go b/pkg/ui/tui.go
index feb7bda..35bc05c 100644
--- a/pkg/ui/tui.go
+++ b/pkg/ui/tui.go
@@ -303,6 +303,14 @@ func (m mainModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			} else {
 				m.diffViewer.ScrollTop()
 			}
+		case key.Matches(msg, keys.ScrollLeft):
+			if m.activePanel != FileTreePanel {
+				m.diffViewer.ScrollLeft()
+			}
+		case key.Matches(msg, keys.ScrollRight):
+			if m.activePanel != FileTreePanel {
+				m.diffViewer.ScrollRight()
+			}
 		case key.Matches(msg, keys.Copy):
 			cmd = m.fileTree.CopyCurrNodePath()
 			if cmd != nil {