- add invoice generator screenshot, add it to sidebar and tools.json

Author: TobiasMue91

data/tools.json

@@ -1351,5 +1351,16 @@
     "aiPowered": false,
     "featured": false,
     "date": "2025-04-30"
+  },
+  {
+    "id": "invoice_generator",
+    "title": "Invoice Generator",
+    "description": "Create professional invoices instantly with our free online invoice generator. Customize templates, add your logo, track payments, and export as PDF. No sign-up required.",
+    "url": "tools/invoice_generator.html",
+    "screenshot": "screenshots/screenshot_176.png",
+    "type": "tool",
+    "aiPowered": false,
+    "featured": false,
+    "date": "2025-04-30"
   }
 ]

screenshots/screenshot_176.png

@@ -261,6 +261,7 @@ <h2>Tools by ChatGPT</h2>
       <li><a href="/tools/character_map_explorer.html">Character Map Explorer</a></li>
       <li><a href="/tools/css_cursor_playground.html">CSS Cursor Playground - Interactive CSS Cursor Property Tool</a></li>
       <li><a href="/tools/text_sound_visualizer.html">Text Sound Visualizer</a></li>
+      <li><a href="/tools/invoice_generator.html">Invoice Generator</a></li>
 <!-- end -->
     </ul>
   </div>