diff --git a/CLAUDE.md b/CLAUDE.md
index b3b11fd..94ab0f1 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -66,11 +66,22 @@ The extension exposes these REST endpoints:
 - Content persistence across sidebar open/close cycles
 - Real-time tab rendering on note operations
 - Button layout: Save/Rename/LoRA submenu on left, Refresh/Delete on right
+- **Search Functionality**: Live search through note content with highlighted results and line navigation
 - **Unsaved Changes Tracking**: Visual indicators (*) for modified notes
 - **Content Preservation**: Tab switching preserves unsaved content
 - **Change Detection**: Automatic tracking of modifications vs saved state
 - **Append Integration**: Submenu with three formatting options for appending LoRA lists (extensible for other content types)
 
+### Search Functionality
+- **Search Input**: Located below button container with "Search lines..." placeholder
+- **Live Search**: Results update as you type, case-insensitive matching
+- **Split View**: Original textarea remains fully editable while search results appear below
+- **Result Navigation**: Click any search result to jump to that line in the main editor
+- **Highlighting**: Matching text highlighted with yellow background in search results
+- **Clear Button**: PrimeVue `pi-times-circle` icon for quick search clearing
+- **Auto-Update**: Search results refresh when switching between notes
+- **HTML Safety**: Proper escaping prevents HTML injection in search results
+
 ### Unsaved Changes Behavior
 - Notes with modifications show asterisk (*) in tab name
 - Switching tabs preserves unsaved content in inactive notes
@@ -99,8 +110,9 @@ No automated tests defined. Manual testing workflow:
 2. Verify sidebar tab appears with "Notes" label and book icon
 3. Test CRUD operations: create, edit, save, rename, delete notes
 4. Verify tab switching and content persistence
-5. Test LoRA integration: verify submenu appears on click with three format options
-6. Verify unsaved changes tracking with asterisk (*) indicators
+5. Test search functionality: enter search terms, verify results highlighting and line navigation
+6. Test LoRA integration: verify submenu appears on click with three format options
+7. Verify unsaved changes tracking with asterisk (*) indicators
 
 ### Development Workflow
 1. Modify Python code in `__init__.py` for backend changes
@@ -115,17 +127,18 @@ No automated tests defined. Manual testing workflow:
 - **UI state changes**: Modify `NotesStore` class in `js/stores/NotesStore.js`
 - **Append functionality changes**: Update `js/components/AppendMenu.js` and related backend endpoints
 - **Adding new components**: Create new files in `js/components/` and import them in `extension.js`
+- **Search functionality changes**: Modify `onSearchChange()` and related methods in `extension.js`
 - **API changes**: Update `js/api/notesApi.js` static methods and error handling
 
 ### File Structure
 - `notes/` - Storage directory for markdown notes (auto-created)
 - `js/` - Frontend assets loaded by ComfyUI
-  - `extension.js` - Main extension entry point (~450 lines)
+  - `extension.js` - Main extension entry point (~580 lines, includes search functionality)
   - `stores/NotesStore.js` - State management (~80 lines)  
   - `components/AppendMenu.js` - Append functionality (~170 lines)
   - `api/notesApi.js` - API service layer (~90 lines)
   - `utils/validation.js` - Validation utilities (~10 lines)
-  - `notes-sidebar.css` - UI styling
+  - `notes-sidebar.css` - UI styling (includes search component styles)
 - `__init__.py` - Main extension code
 - `pyproject.toml` - Project metadata
 
diff --git a/js/extension.js b/js/extension.js
index cbd413f..89f1e6b 100644
--- a/js/extension.js
+++ b/js/extension.js
@@ -20,6 +20,8 @@ class NotesSidebar {
         this.renameBtn = null;
         this.deleteBtn = null;
         this.appendMenu = null;
+        this.searchInput = null;
+        this.searchResults = null;
         this.isInitialized = false;
         this.sidebarElement = null;
 
@@ -47,6 +49,11 @@ class NotesSidebar {
         if (updates.activeNote || updates.unsavedChanges) {
             this.updateButtonState();
         }
+
+        // Update search results if active note changed and search is active
+        if (updates.activeNote && this.searchInput && this.searchInput.value.trim()) {
+            this.onSearchChange();
+        }
     }
 
     get notes() { return this.store.state.notes; }
@@ -123,6 +130,7 @@ class NotesSidebar {
 
         this.createTabsContainer(this.sidebarElement);
         this.createNoteButtonContainer(this.sidebarElement);
+        this.createSearchContainer(this.sidebarElement);
         this.createContentArea(this.sidebarElement);
 
         el.appendChild(this.sidebarElement);
@@ -208,6 +216,36 @@ class NotesSidebar {
         parent.appendChild(buttonContainer);
     }
 
+    createSearchContainer(parent) {
+        const searchContainer = document.createElement('div');
+        searchContainer.className = 'notes-search-container';
+
+        const inputWrapper = document.createElement('div');
+        inputWrapper.className = 'notes-search-input-wrapper';
+
+        this.searchInput = document.createElement('input');
+        this.searchInput.type = 'text';
+        this.searchInput.className = 'notes-search-input';
+        this.searchInput.placeholder = 'Search lines...';
+        this.searchInput.addEventListener('input', () => this.onSearchChange());
+
+        const clearButton = document.createElement('button');
+        clearButton.className = 'notes-search-clear';
+        clearButton.innerHTML = '<i class="pi pi-times-circle"></i>';
+        clearButton.title = 'Clear search';
+        clearButton.addEventListener('click', () => this.clearSearch());
+
+        this.searchResults = document.createElement('div');
+        this.searchResults.className = 'notes-search-results';
+        this.searchResults.style.display = 'none';
+
+        inputWrapper.appendChild(this.searchInput);
+        inputWrapper.appendChild(clearButton);
+        searchContainer.appendChild(inputWrapper);
+        searchContainer.appendChild(this.searchResults);
+        parent.appendChild(searchContainer);
+    }
+
     createContentArea(parent) {
         this.contentArea = document.createElement('div');
         this.contentArea.className = 'notes-content-area';
@@ -444,6 +482,92 @@ class NotesSidebar {
         // Check if content has changed from saved version
         const hasUnsavedChanges = currentContent !== savedContent;
         this.store.setUnsavedChanges(this.activeNote, hasUnsavedChanges);
+
+        // Update search results if search is active
+        if (this.searchInput && this.searchInput.value.trim()) {
+            this.onSearchChange();
+        }
+    }
+
+    onSearchChange() {
+        const searchText = this.searchInput.value.trim();
+
+        if (!searchText) {
+            // Hide search results when search is empty
+            this.searchResults.style.display = 'none';
+            return;
+        }
+
+        if (!this.activeNote || !this.textArea.value) {
+            // No active note or content to search
+            this.searchResults.style.display = 'none';
+            return;
+        }
+
+        const content = this.textArea.value;
+        const lines = content.split('\n');
+        const matchingLines = [];
+
+        lines.forEach((line, index) => {
+            if (line.toLowerCase().includes(searchText.toLowerCase())) {
+                matchingLines.push({
+                    lineNumber: index + 1,
+                    content: line
+                });
+            }
+        });
+
+        if (matchingLines.length === 0) {
+            this.searchResults.innerHTML = '<div class="notes-search-no-results">No matching lines found</div>';
+        } else {
+            this.searchResults.innerHTML = matchingLines.map(line =>
+                `<div class="notes-search-result" onclick="this.parentNode.parentNode.parentNode.querySelector('.notes-textarea').focus(); this.parentNode.parentNode.parentNode.querySelector('.notes-textarea').setSelectionRange(${this.getLineStartPosition(content, line.lineNumber - 1)}, ${this.getLineEndPosition(content, line.lineNumber - 1)});">
+                    <span class="notes-search-line-number">${line.lineNumber}:</span>
+                    <span class="notes-search-line-content">${this.highlightMatch(this.escapeHtml(line.content), searchText)}</span>
+                </div>`
+            ).join('');
+        }
+
+        this.searchResults.style.display = 'block';
+    }
+
+    clearSearch() {
+        this.searchInput.value = '';
+        this.searchResults.style.display = 'none';
+        this.searchInput.focus();
+    }
+
+    getLineStartPosition(content, lineIndex) {
+        const lines = content.split('\n');
+        let position = 0;
+        for (let i = 0; i < lineIndex; i++) {
+            position += lines[i].length + 1; // +1 for newline character
+        }
+        return position;
+    }
+
+    getLineEndPosition(content, lineIndex) {
+        const lines = content.split('\n');
+        let position = 0;
+        for (let i = 0; i <= lineIndex; i++) {
+            position += lines[i].length;
+            if (i < lineIndex) position += 1; // +1 for newline character
+        }
+        return position;
+    }
+
+    escapeHtml(text) {
+        const div = document.createElement('div');
+        div.textContent = text;
+        return div.innerHTML;
+    }
+
+    highlightMatch(text, filterText) {
+        const escapedFilter = filterText.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+        const regex = new RegExp(escapedFilter, 'gi');
+        return text.replace(regex, function(match) {
+            return `<mark>${match}</mark>`;
+        });
     }
 
 }
diff --git a/js/notes-sidebar.css b/js/notes-sidebar.css
index a0887d3..7bdc370 100644
--- a/js/notes-sidebar.css
+++ b/js/notes-sidebar.css
@@ -186,4 +186,113 @@
 
 .notes-submenu-item:hover {
     background: #444;
+}
+
+/* Search Container */
+.notes-search-container {
+    padding: 10px;
+    background: #1a1a1a;
+    border-bottom: 1px solid #444;
+}
+
+.notes-search-input-wrapper {
+    position: relative;
+    display: flex;
+    align-items: center;
+}
+
+.notes-search-input {
+    width: 100%;
+    padding: 8px 35px 8px 12px;
+    background: #2a2a2a;
+    border: 1px solid #444;
+    border-radius: 4px;
+    color: #fff;
+    font-size: 14px;
+    box-sizing: border-box;
+}
+
+.notes-search-clear {
+    position: absolute;
+    right: 8px;
+    background: transparent;
+    border: none;
+    color: #888;
+    cursor: pointer;
+    padding: 4px;
+    border-radius: 4px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+.notes-search-clear:hover {
+    color: #fff;
+    background: rgba(255, 255, 255, 0.1);
+}
+
+.notes-search-input:focus {
+    outline: none;
+    border-color: #666;
+    background: #333;
+}
+
+.notes-search-input::placeholder {
+    color: #888;
+}
+
+/* Search Results */
+.notes-search-results {
+    max-height: 200px;
+    overflow-y: auto;
+    margin-top: 10px;
+    background: #2a2a2a;
+    border: 1px solid #444;
+    border-radius: 4px;
+}
+
+.notes-search-result {
+    padding: 6px 10px;
+    border-bottom: 1px solid #444;
+    cursor: pointer;
+    display: flex;
+    align-items: flex-start;
+    gap: 8px;
+    font-size: 12px;
+    line-height: 1.4;
+}
+
+.notes-search-result:last-child {
+    border-bottom: none;
+}
+
+.notes-search-result:hover {
+    background: #444;
+}
+
+.notes-search-line-number {
+    color: #888;
+    font-weight: bold;
+    flex-shrink: 0;
+    min-width: 30px;
+}
+
+.notes-search-line-content {
+    color: #fff;
+    word-break: break-all;
+}
+
+.notes-search-line-content mark {
+    background: #ffeb3b;
+    color: #000;
+    padding: 1px 2px;
+    border-radius: 2px;
+}
+
+.notes-search-no-results {
+    padding: 15px;
+    text-align: center;
+    color: #888;
+    font-style: italic;
+    font-size: 12px;
 }
\ No newline at end of file