diff --git a/internal/filetree/filetree.go b/internal/filetree/filetree.go
index 30d74da..ce0c838 100644
--- a/internal/filetree/filetree.go
+++ b/internal/filetree/filetree.go
@@ -28,9 +28,15 @@ func New(paths []string) *FileTree {
 	tree := &FileTree{
 		root: make(Node),
 	}
-
 	for _, path := range paths {
-		tree.addPath(strings.Split(path, "/"))
+		// Split path into components, automatically filtering empty parts
+		parts := strings.FieldsFunc(path, func(r rune) bool {
+			return r == '/' || r == '\\'
+		})
+
+		if len(parts) > 0 {
+			tree.addPath(parts)
+		}
 	}
 
 	return tree
diff --git a/internal/filetree/filetree_test.go b/internal/filetree/filetree_test.go
index 74e33cf..899f1af 100644
--- a/internal/filetree/filetree_test.go
+++ b/internal/filetree/filetree_test.go
@@ -68,4 +68,56 @@ func TestFileTree(t *testing.T) {
 			t.Errorf("Expected:\n%s\n\nGot:\n%s", expected, result)
 		}
 	})
+
+	t.Run("mixed path separators", func(t *testing.T) {
+		// Test that FileTree can handle mixed Windows and Unix paths
+		paths := []string{
+			"file1.txt",
+			"dir\\subdir\\file2.txt",  // Windows-style
+			"dir/file3.txt",          // Unix-style
+		}
+		result := Build(paths, "")
+		expected := strings.Join([]string{
+			"/",
+			"├── dir/",
+			"│   ├── subdir/",
+			"│   │   └── file2.txt",
+			"│   └── file3.txt",
+			"└── file1.txt",
+		}, "\n")
+
+		if result != expected {
+			t.Errorf("Expected:\n%s\n\nGot:\n%s", expected, result)
+		}
+	})
+
+	t.Run("edge cases with slashes", func(t *testing.T) {
+		// Test edge cases: double slashes, leading/trailing slashes
+		paths := []string{
+			"normal/path.txt",
+			"double//slash.txt",       // double slash
+			"/leading/slash.txt",      // leading slash  
+			"trailing/slash/.txt",     // trailing slash
+			"multiple///slashes.txt",  // multiple slashes
+		}
+		result := Build(paths, "")
+		expected := strings.Join([]string{
+			"/",
+			"├── double/",
+			"│   └── slash.txt",
+			"├── leading/",
+			"│   └── slash.txt", 
+			"├── multiple/",
+			"│   └── slashes.txt",
+			"├── normal/",
+			"│   └── path.txt",
+			"└── trailing/",
+			"    └── slash/",
+			"        └── .txt",
+		}, "\n")
+
+		if result != expected {
+			t.Errorf("Expected:\n%s\n\nGot:\n%s", expected, result)
+		}
+	})
 }
diff --git a/internal/processor/processor.go b/internal/processor/processor.go
index 7142dde..2d52280 100644
--- a/internal/processor/processor.go
+++ b/internal/processor/processor.go
@@ -212,19 +212,22 @@ func (p *Processor) collectFiles() ([]string, error) {
 		if info.IsDir() {
 			return nil
 		}
-
-		// Get relative path for ignore checking
+		// Get relative path and normalize separators for cross-platform consistency
 		relPath, err := filepath.Rel(p.rootDir, path)
 		if err != nil {
 			return fmt.Errorf("failed to get relative path: %w", err)
 		}
-
-		// Skip if file matches ignore pattern
-		if p.matcher != nil && p.matcher.Match(strings.Split(relPath, "/"), false) {
+		
+		// Normalize to forward slashes for consistent processing
+		// This ensures gitignore patterns work and output is uniform across platforms
+		normalizedPath := filepath.ToSlash(relPath)
+		// Check gitignore patterns using normalized path
+		if p.matcher != nil && p.matcher.Match(strings.Split(normalizedPath, "/"), false) {
 			return nil
 		}
 
-		files = append(files, relPath)
+		// Store normalized path for consistent cross-platform output
+		files = append(files, normalizedPath)
 		return nil
 	})
 
@@ -274,6 +277,5 @@ func (p *Processor) writeContents(w *bufio.Writer, files []string) error {
 			return err
 		}
 	}
-
 	return nil
 }