diff --git a/gui.py b/gui.py
index 464ada6..911141a 100644
--- a/gui.py
+++ b/gui.py
@@ -1,9 +1,11 @@
 # gui.py 
-from PyQt6.QtWidgets import QApplication, QMainWindow, QFileDialog, QVBoxLayout, QPushButton, QLineEdit, QLabel, QWidget, QMessageBox, QProgressBar
+import os
+from PyQt6.QtWidgets import QApplication, QMainWindow, QFileDialog, QVBoxLayout, QPushButton, QLineEdit, QLabel, QWidget, QMessageBox, QProgressBar, QCheckBox
 from PyQt6.QtCore import Qt
 from utils import image_processor
 import sys
 from PyQt6.QtGui import QIcon  # 导入 QIcon 类
+from PIL import Image  # 导入 Image 类
 
 class ImageProcessingApp(QMainWindow):
     def __init__(self):
@@ -16,20 +18,27 @@ def __init__(self):
         app_icon = QIcon("snapforge.ico")  # 创建 QIcon 对象
         self.setWindowIcon(app_icon)  # 设置窗口图标
 
-        self.resize(400, 350)
+        self.resize(400, 380)  # 稍微增加窗口高度
 
         self.source_directory = None
         self.target_directory = None
+        self.single_file_mode = False
+        self.source_file = None  # 用于存储单个文件路径
 
         self.init_ui()
 
     def init_ui(self):
         layout = QVBoxLayout()
 
-        # 选择文件夹
-        self.source_label = QLabel("选择原始图片文件夹:")
-        self.source_button = QPushButton("选择文件夹")
-        self.source_button.clicked.connect(self.select_source_directory)
+        # 单个文件处理模式选择
+        self.single_file_checkbox = QCheckBox("单个文件处理")
+        self.single_file_checkbox.stateChanged.connect(self.toggle_file_mode)
+        layout.addWidget(self.single_file_checkbox)
+
+        # 选择文件夹/文件
+        self.source_label = QLabel("选择原始图片文件夹/文件:")
+        self.source_button = QPushButton("选择")
+        self.source_button.clicked.connect(self.select_source)
 
         self.target_label = QLabel("选择保存图片文件夹:")
         self.target_button = QPushButton("选择文件夹")
@@ -84,84 +93,152 @@ def init_ui(self):
         container.setLayout(layout)
         self.setCentralWidget(container)
 
-    def select_source_directory(self):
-        self.source_directory = QFileDialog.getExistingDirectory(self, "选择原始图片文件夹")
+    def select_source(self):
+        if self.single_file_mode:
+            self.source_file, _ = QFileDialog.getOpenFileName(self, "选择图片文件", filter="Image Files (*.png *.jpg *.jpeg *.bmp *.tiff)")
+            if self.source_file:
+                self.source_label.setText(f"已选择文件: {self.source_file}")
+        else:
+            self.source_directory = QFileDialog.getExistingDirectory(self, "选择原始图片文件夹")
 
     def select_target_directory(self):
         self.target_directory = QFileDialog.getExistingDirectory(self, "选择保存图片文件夹")
 
     def rename_files(self):
-        if not self.source_directory or not self.target_directory:
-            QMessageBox.warning(self, "警告", "请先选择原始和保存图片文件夹！")
-            return
-
-        prefix = self.prefix_entry.text()
-        try:
-            start_number = int(self.start_number_entry.text())
-        except ValueError:
-            QMessageBox.warning(self, "警告", "起始编号必须是一个整数！")
-            return
-
-        try:
-            renamed_count = image_processor.batch_rename_files(
-                self.source_directory,
-                self.target_directory,
-                prefix,
-                start_number,
-                self.update_progress_bar
-            )
-            QMessageBox.information(self, "结果", f"重命名完成！共重命名了 {renamed_count} 个文件。")
-        except Exception as e:
-            # 处理其他潜在的异常
-            QMessageBox.warning(self, "错误", f"发生错误: {e}")
-
+        if self.single_file_mode:
+            if not self.source_file or not self.target_directory:
+                QMessageBox.warning(self, "警告", "请先选择文件和目标文件夹！")
+                return
+
+            prefix = self.prefix_entry.text()
+            try:
+                start_number = int(self.start_number_entry.text())
+            except ValueError:
+                QMessageBox.warning(self, "警告", "起始编号必须是一个整数！")
+                return
+
+            try:
+                file_name, file_ext = os.path.splitext(os.path.basename(self.source_file))
+                new_file_name = f"{prefix}{start_number}{file_ext}"
+                new_file_path = os.path.join(self.target_directory, new_file_name)
+                os.rename(self.source_file, new_file_path)
+                QMessageBox.information(self, "结果", f"重命名完成！")
+            except Exception as e:
+                QMessageBox.warning(self, "错误", f"发生错误: {e}")
+
+        else:  # 批量处理模式
+            if not self.source_directory or not self.target_directory:
+                QMessageBox.warning(self, "警告", "请先选择原始和保存图片文件夹！")
+                return
+
+            prefix = self.prefix_entry.text()
+            try:
+                start_number = int(self.start_number_entry.text())
+            except ValueError:
+                QMessageBox.warning(self, "警告", "起始编号必须是一个整数！")
+                return
+
+            try:
+                renamed_count = image_processor.batch_rename_files(
+                    self.source_directory,
+                    self.target_directory,
+                    prefix,
+                    start_number,
+                    self.update_progress_bar
+                )
+                QMessageBox.information(self, "结果", f"重命名完成！共重命名了 {renamed_count} 个文件。")
+            except Exception as e:
+                # 处理其他潜在的异常
+                QMessageBox.warning(self, "错误", f"发生错误: {e}")
 
     def convert_files(self):
-        if not self.source_directory or not self.target_directory:
-            QMessageBox.warning(self, "警告", "请先选择原始和保存图片文件夹！")
-            return
-
-        target_format = self.format_entry.text().lower()
-        if not target_format:
-            QMessageBox.warning(self, "警告", "目标格式不能为空！")
-            return
-
-        try:
-            converted_count = image_processor.batch_convert_images(
-                self.source_directory,
-                self.target_directory,
-                target_format,
-                self.update_progress_bar
-            )
-            QMessageBox.information(self, "结果", f"格式转换完成！共转换了 {converted_count} 个文件。")
-        except Exception as e:
-            # 处理其他潜在的异常
-            QMessageBox.warning(self, "错误", f"发生错误: {e}")
+        if self.single_file_mode:
+            if not self.source_file or not self.target_directory:
+                QMessageBox.warning(self, "警告", "请先选择文件和目标文件夹！")
+                return
+
+            target_format = self.format_entry.text().lower()
+            if not target_format:
+                QMessageBox.warning(self, "警告", "目标格式不能为空！")
+                return
+
+            try:
+                file_name, _ = os.path.splitext(os.path.basename(self.source_file))
+                new_file_name = f"{file_name}.{target_format}"
+                new_file_path = os.path.join(self.target_directory, new_file_name)
+                img = Image.open(self.source_file)
+                img.save(new_file_path, target_format.upper())
+                QMessageBox.information(self, "结果", f"转换完成！")
+            except Exception as e:
+                QMessageBox.warning(self, "错误", f"发生错误: {e}")
+
+        else:  # 批量处理模式
+            if not self.source_directory or not self.target_directory:
+                QMessageBox.warning(self, "警告", "请先选择原始和保存图片文件夹！")
+                return
+
+            target_format = self.format_entry.text().lower()
+            if not target_format:
+                QMessageBox.warning(self, "警告", "目标格式不能为空！")
+                return
+
+            try:
+                converted_count = image_processor.batch_convert_images(
+                    self.source_directory,
+                    self.target_directory,
+                    target_format,
+                    self.update_progress_bar
+                )
+                QMessageBox.information(self, "结果", f"格式转换完成！共转换了 {converted_count} 个文件。")
+            except Exception as e:
+                # 处理其他潜在的异常
+                QMessageBox.warning(self, "错误", f"发生错误: {e}")
 
     def compress_files(self):
-        if not self.source_directory or not self.target_directory:
-            QMessageBox.warning(self, "警告", "请先选择原始和保存图片文件夹！")
-            return
-
-        try:
-            quality = int(self.quality_entry.text())
-            if quality < 1 or quality > 100:
-                raise ValueError
-        except ValueError:
-            QMessageBox.warning(self, "警告", "压缩质量必须是1到100之间的整数！")
-            return
-
-        try:
-            compressed_count = image_processor.batch_compress_images(
-                self.source_directory,
-                self.target_directory,
-                quality,
-                self.update_progress_bar
-            )
-            QMessageBox.information(self, "结果", f"压缩完成！共压缩了 {compressed_count} 个文件。")
-        except Exception as e:
-            # 处理其他潜在的异常
-            QMessageBox.warning(self, "错误", f"发生错误: {e}")
+        if self.single_file_mode:
+            if not self.source_file or not self.target_directory:
+                QMessageBox.warning(self, "警告", "请先选择文件和目标文件夹！")
+                return
+
+            try:
+                quality = int(self.quality_entry.text())
+                if quality < 1 or quality > 100:
+                    raise ValueError
+            except ValueError:
+                QMessageBox.warning(self, "警告", "压缩质量必须是1到100之间的整数！")
+                return
+
+            try:
+                new_file_path = os.path.join(self.target_directory, os.path.basename(self.source_file))
+                img = Image.open(self.source_file)
+                img.save(new_file_path, optimize=True, quality=quality)
+                QMessageBox.information(self, "结果", f"压缩完成！")
+            except Exception as e:
+                QMessageBox.warning(self, "错误", f"发生错误: {e}")
+        else:  # 批量处理模式
+            if not self.source_directory or not self.target_directory:
+                QMessageBox.warning(self, "警告", "请先选择原始和保存图片文件夹！")
+                return
+
+            try:
+                quality = int(self.quality_entry.text())
+                if quality < 1 or quality > 100:
+                    raise ValueError
+            except ValueError:
+                QMessageBox.warning(self, "警告", "压缩质量必须是1到100之间的整数！")
+                return
+
+            try:
+                compressed_count = image_processor.batch_compress_images(
+                    self.source_directory,
+                    self.target_directory,
+                    quality,
+                    self.update_progress_bar
+                )
+                QMessageBox.information(self, "结果", f"压缩完成！共压缩了 {compressed_count} 个文件。")
+            except Exception as e:
+                # 处理其他潜在的异常
+                QMessageBox.warning(self, "错误", f"发生错误: {e}")
 
     def update_progress_bar(self, current, total):
         """更新进度条。
@@ -172,6 +249,13 @@ def update_progress_bar(self, current, total):
         """
         self.progress_bar.setValue(int(current / total * 100))
 
+    def toggle_file_mode(self, state):
+        self.single_file_mode = state == Qt.Checked
+        if self.single_file_mode:
+            self.source_label.setText("选择原始图片文件:")
+        else:
+            self.source_label.setText("选择原始图片文件夹:")
+
 if __name__ == "__main__":
     app = QApplication(sys.argv)
     window = ImageProcessingApp()