diff --git a/z.ai/notes/index.php b/z.ai/notes/index.php
index bbe3384..189725d 100644
--- a/z.ai/notes/index.php
+++ b/z.ai/notes/index.php
@@ -4,6 +4,7 @@ session_start();
 // 配置
 define('DB_FILE', 'notes.db');
 define('UPLOAD_DIR', 'uploads');
+define('IMAGES_DIR', 'uploads/images');
 define('APP_NAME', '简约记事本');
 define('VERSION', '1.0.0');
 define('NOTES_PER_PAGE', 25);
@@ -14,6 +15,11 @@ if (!file_exists(UPLOAD_DIR)) {
     mkdir(UPLOAD_DIR, 0755, true);
 }
 
+// 确保图片目录存在
+if (!file_exists(IMAGES_DIR)) {
+    mkdir(IMAGES_DIR, 0755, true);
+}
+
 // 获取当前页面基础URL
 function getBaseUrl() {
     $protocol = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? 'https' : 'http';
@@ -59,6 +65,134 @@ class Encryption {
     }
 }
 
+// 处理内容中的链接和图片
+function processContent($content) {
+    // 自动下载外部图片并替换为本地链接
+    $content = processExternalImages($content);
+    
+    // 自动识别URL并转换为Markdown链接格式
+    $content = autoFormatLinks($content);
+    
+    return $content;
+}
+
+// 自动下载外部图片
+function processExternalImages($content) {
+    // 匹配Markdown图片格式
+    $pattern = '/!\[(.*?)\]\((https?:\/\/[^\s)]+)\)/';
+    
+    $content = preg_replace_callback($pattern, function($matches) {
+        $alt = $matches[1];
+        $url = $matches[2];
+        
+        // 检查是否是外部图片URL
+        if (isExternalImage($url)) {
+            $localPath = downloadAndSaveImage($url);
+            if ($localPath) {
+                return '![' . $alt . '](' . $localPath . ')';
+            }
+        }
+        
+        return $matches[0];
+    }, $content);
+    
+    // 匹配纯图片URL（非Markdown格式）
+    $pattern = '/(?<!\]\()https?:\/\/[^\s]*\.(jpg|jpeg|png|gif|webp)(?!\))/i';
+    
+    $content = preg_replace_callback($pattern, function($matches) {
+        $url = $matches[0];
+        
+        // 检查是否是外部图片URL
+        if (isExternalImage($url)) {
+            $localPath = downloadAndSaveImage($url);
+            if ($localPath) {
+                return '![](' . $localPath . ')';
+            }
+        }
+        
+        return $url;
+    }, $content);
+    
+    return $content;
+}
+
+// 检查是否是外部图片URL
+function isExternalImage($url) {
+    // 检查是否是HTTP/HTTPS URL
+    if (!preg_match('/^https?:\/\//', $url)) {
+        return false;
+    }
+    
+    // 检查是否是当前域名的URL
+    $baseUrl = getBaseUrl();
+    if (strpos($url, $baseUrl) === 0) {
+        return false;
+    }
+    
+    // 检查URL是否包含图片扩展名
+    $imageExtensions = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
+    $extension = strtolower(pathinfo($url, PATHINFO_EXTENSION));
+    
+    return in_array($extension, $imageExtensions);
+}
+
+// 下载并保存图片
+function downloadAndSaveImage($url) {
+    try {
+        // 获取图片内容
+        $imageData = file_get_contents($url);
+        if (!$imageData) {
+            return false;
+        }
+        
+        // 获取图片信息
+        $imageInfo = getimagesizefromstring($imageData);
+        if (!$imageInfo) {
+            return false;
+        }
+        
+        // 生成唯一文件名
+        $extension = image_type_to_extension($imageInfo[2]);
+        $filename = uniqid() . $extension;
+        $filepath = IMAGES_DIR . '/' . $filename;
+        
+        // 保存图片
+        if (file_put_contents($filepath, $imageData)) {
+            // 返回相对于当前脚本的路径
+            return IMAGES_DIR . '/' . $filename;
+        }
+        
+        return false;
+    } catch (Exception $e) {
+        return false;
+    }
+}
+
+// 自动格式化链接
+function autoFormatLinks($content) {
+    // 匹配非Markdown格式的URL
+    $pattern = '/(?<!\]\()https?:\/\/[^\s\)]+(?!\))/i';
+    
+    $content = preg_replace_callback($pattern, function($matches) {
+        $url = $matches[0];
+        
+        // 如果已经是Markdown链接格式，则跳过
+        if (preg_match('/\[' . preg_quote($url, '/') . '\]\(' . preg_quote($url, '/') . '\)/', $content)) {
+            return $url;
+        }
+        
+        // 如果是图片URL，则跳过（已在processExternalImages中处理）
+        if (isExternalImage($url)) {
+            return $url;
+        }
+        
+        // 转换为Markdown链接格式
+        return '[' . $url . '](' . $url . ')';
+    }, $content);
+    
+    return $content;
+}
+
 // 初始化数据库
 function initDatabase() {
     try {
@@ -74,11 +208,11 @@ function initDatabase() {
             )
         ');
         
-        // 创建笔记表（加密存储）
+        // 创建笔记表（标题不加密，内容加密）
         $db->exec('
             CREATE TABLE IF NOT EXISTS notes (
                 id INTEGER PRIMARY KEY AUTOINCREMENT,
-                title_enc TEXT NOT NULL,
+                title TEXT NOT NULL,
                 content_enc TEXT NOT NULL,
                 tags TEXT,
                 created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
@@ -101,6 +235,7 @@ function initDatabase() {
         ');
         
         // 创建索引
+        $db->exec('CREATE INDEX IF NOT EXISTS idx_notes_title ON notes(title)');
         $db->exec('CREATE INDEX IF NOT EXISTS idx_notes_tags ON notes(tags)');
         $db->exec('CREATE INDEX IF NOT EXISTS idx_notes_created ON notes(created_at)');
         $db->exec('CREATE INDEX IF NOT EXISTS idx_attachments_note_id ON attachments(note_id)');
@@ -167,10 +302,11 @@ function getNotesCount($search = '', $tag = '') {
     $params = [];
     
     if ($search) {
-        // 搜索需要解密，这里简化处理，只搜索标签
-        $sql .= ' AND tags LIKE ?';
+        // 现在可以搜索标题了
+        $sql .= ' AND (title LIKE ? OR tags LIKE ?)';
         $searchParam = '%' . $search . '%';
         $params[] = $searchParam;
+        $params[] = $searchParam;
     }
     
     if ($tag) {
@@ -195,7 +331,8 @@ function getNotes($page = 1, $search = '', $tag = '') {
     $params = [];
     
     if ($search) {
-        $sql .= ' AND tags LIKE ?';
+        $sql .= ' AND (title LIKE ? OR tags LIKE ?)';
+        $params[] = '%' . $search . '%';
         $params[] = '%' . $search . '%';
     }
     
@@ -217,10 +354,9 @@ function getNotes($page = 1, $search = '', $tag = '') {
     $notes = [];
     
     while ($row = $result->fetchArray(SQLITE3_ASSOC)) {
-        // 解密数据
-        $row['title'] = Encryption::decrypt($row['title_enc']);
+        // 只解密内容，标题不需要解密
         $row['content'] = Encryption::decrypt($row['content_enc']);
-        unset($row['title_enc'], $row['content_enc']);
+        unset($row['content_enc']);
         $notes[] = $row;
     }
     
@@ -236,10 +372,9 @@ function getNote($id) {
     $note = $result->fetchArray(SQLITE3_ASSOC);
     
     if ($note) {
-        // 解密数据
-        $note['title'] = Encryption::decrypt($note['title_enc']);
+        // 只解密内容，标题不需要解密
         $note['content'] = Encryption::decrypt($note['content_enc']);
-        unset($note['title_enc'], $note['content_enc']);
+        unset($note['content_enc']);
     }
     
     return $note;
@@ -248,9 +383,13 @@ function getNote($id) {
 // 创建笔记
 function createNote($title, $content, $tags) {
     $db = getDB();
-    $stmt = $db->prepare('INSERT INTO notes (title_enc, content_enc, tags) VALUES (?, ?, ?)');
-    $stmt->bindValue(1, Encryption::encrypt($title), SQLITE3_TEXT);
-    $stmt->bindValue(2, Encryption::encrypt($content), SQLITE3_TEXT);
+    
+    // 处理内容中的链接和图片
+    $processedContent = processContent($content);
+    
+    $stmt = $db->prepare('INSERT INTO notes (title, content_enc, tags) VALUES (?, ?, ?)');
+    $stmt->bindValue(1, $title, SQLITE3_TEXT);
+    $stmt->bindValue(2, Encryption::encrypt($processedContent), SQLITE3_TEXT);
     $stmt->bindValue(3, $tags, SQLITE3_TEXT);
     $stmt->execute();
     return $db->lastInsertRowID();
@@ -259,9 +398,13 @@ function createNote($title, $content, $tags) {
 // 更新笔记
 function updateNote($id, $title, $content, $tags) {
     $db = getDB();
-    $stmt = $db->prepare('UPDATE notes SET title_enc = ?, content_enc = ?, tags = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?');
-    $stmt->bindValue(1, Encryption::encrypt($title), SQLITE3_TEXT);
-    $stmt->bindValue(2, Encryption::encrypt($content), SQLITE3_TEXT);
+    
+    // 处理内容中的链接和图片
+    $processedContent = processContent($content);
+    
+    $stmt = $db->prepare('UPDATE notes SET title = ?, content_enc = ?, tags = ?, updated_at = CURRENT_TIMESTAMP WHERE id = ?');
+    $stmt->bindValue(1, $title, SQLITE3_TEXT);
+    $stmt->bindValue(2, Encryption::encrypt($processedContent), SQLITE3_TEXT);
     $stmt->bindValue(3, $tags, SQLITE3_TEXT);
     $stmt->bindValue(4, $id, SQLITE3_INTEGER);
     return $stmt->execute();