diff --git a/application/controllers/Notes.php b/application/controllers/Notes.php
index 991b2e591..8e8e5f68b 100644
--- a/application/controllers/Notes.php
+++ b/application/controllers/Notes.php
@@ -2,7 +2,6 @@
 
 // Notes controller: handles all note actions, with security and input validation
 class Notes extends CI_Controller {
-    // API endpoint: check for duplicate note title in category for user
     // Ensure only authorized users can access Notes controller
     function __construct() {
         parent::__construct();
@@ -41,19 +40,34 @@ class Notes extends CI_Controller {
     function add() {
         $this->load->model('note');
         $this->load->library('form_validation');
-		$this->load->library('callbook'); // Used for callsign parsing
+        $this->load->library('callbook'); // Used for callsign parsing
+
+        // Support prefilled title/category from query string
+        $prefill_title = $this->input->get('title', TRUE);
+        $prefill_category = $this->input->get('category', TRUE);
 
         $suggested_title = null;
         // Validate form fields
         $this->form_validation->set_rules('title', 'Note Title', 'required|callback_contacts_title_unique'); // Custom callback for Contacts category
         $this->form_validation->set_rules('content', 'Content', 'required');
         if ($this->form_validation->run() == FALSE) {
+            // Use POST if available, otherwise use prefill from query string
             $category = $this->input->post('category', TRUE);
-            if ($category === 'Contacts') {
-
-                $suggested_title = strtoupper($this->callbook->get_plaincall($this->input->post('title', TRUE)));
+            if (empty($category) && !empty($prefill_category)) {
+                $category = $prefill_category;
             }
+            if ($category === 'Contacts') {
+                $title_input = $this->input->post('title', TRUE);
+                if (empty($title_input) && !empty($prefill_title)) {
+                    $title_input = $prefill_title;
+                }
+                $suggested_title = strtoupper($this->callbook->get_plaincall($title_input));
+            }
+            // Pass prefill values to view
             $data['suggested_title'] = $suggested_title;
+            $data['prefill_title'] = $prefill_title;
+            $data['prefill_category'] = $prefill_category;
+            $data['category'] = $category;
             $data['page_title'] = __("Add Notes");
             $this->load->view('interface_assets/header', $data);
             $this->load->view('notes/add');
@@ -241,26 +255,36 @@ class Notes extends CI_Controller {
         $id = $this->input->get('id', TRUE); // Optional, for edit
         $check_title = $title;
         if ($category === 'Contacts') {
-            $check_title = strtoupper($title);
+            $this->load->library('callbook');
+            $check_title = strtoupper($this->callbook->get_plaincall($title));
         }
         $where = [
-            'category' => $category,
+            'cat' => $category,
             'user_id' => $user_id,
             'title' => $check_title
         ];
         $query = $this->db->get_where('notes', $where);
-        $duplicate = false;
+        $exists = false;
+        $note_id = null;
         if ($id) {
             foreach ($query->result() as $note) {
                 if ($note->id != $id) {
-                    $duplicate = true;
+                    $exists = true;
+                    $note_id = $note->id;
                     break;
                 }
             }
         } else {
-            $duplicate = $query->num_rows() > 0;
+            if ($query->num_rows() > 0) {
+                $exists = true;
+                $note_id = $query->row()->id;
+            }
         }
-        $this->output->set_content_type('application/json')->set_output(json_encode(['duplicate' => $duplicate]));
+        $response = ['exists' => $exists];
+        if ($exists && $note_id) {
+            $response['id'] = $note_id;
+        }
+        $this->output->set_content_type('application/json')->set_output(json_encode($response));
     }
 
     // Form validation callback for add: unique Contacts note title for user, only core callsign
diff --git a/application/views/notes/add.php b/application/views/notes/add.php
index 177ef3d50..1ad0172b1 100644
--- a/application/views/notes/add.php
+++ b/application/views/notes/add.php
@@ -29,7 +29,18 @@
       <form method="post" action="<?php echo site_url('notes/add'); ?>" name="notes_add" id="notes_add">
         <div class="mb-3">
           <label for="inputTitle"><?= __("Title"); ?></label>
-          <input type="text" name="title" class="form-control" id="inputTitle" value="<?php echo isset($suggested_title) && $suggested_title ? $suggested_title : set_value('title'); ?>">
+      <input type="text" name="title" class="form-control" id="inputTitle" value="<?php
+      // Priority: suggested_title > POST value > prefill_title > ''
+      if (isset($suggested_title) && $suggested_title) {
+        echo $suggested_title;
+      } elseif (set_value('title')) {
+        echo set_value('title');
+      } elseif (isset($prefill_title) && $prefill_title) {
+        echo htmlspecialchars($prefill_title);
+      } else {
+        echo '';
+      }
+      ?>">
         </div>
         <div class="mb-3">
           <label for="catSelect">
@@ -39,8 +50,10 @@
             </span>
           </label>
           <select name="category" class="form-select" id="catSelect">
-            <?php foreach (Note::get_possible_categories() as $category_key => $category_label): ?>
-              <option value="<?= htmlspecialchars($category_key) ?>"<?= (set_value('category', 'General') == $category_key ? ' selected="selected"' : '') ?>><?= $category_label ?></option>
+            <?php
+              $selected_category = set_value('category', isset($category) ? $category : (isset($prefill_category) ? $prefill_category : 'General'));
+              foreach (Note::get_possible_categories() as $category_key => $category_label): ?>
+                <option value="<?= htmlspecialchars($category_key) ?>"<?= ($selected_category == $category_key ? ' selected="selected"' : '') ?>><?= $category_label ?></option>
             <?php endforeach; ?>
           </select>
         </div>
diff --git a/application/views/qso/index.php b/application/views/qso/index.php
index 93586d393..1aa182d38 100644
--- a/application/views/qso/index.php
+++ b/application/views/qso/index.php
@@ -154,7 +154,7 @@ switch ($date_format) {
               <!-- Callsign Input -->
               <div class="row">
                 <div class="mb-3 col-md-12">
-                  <label for="callsign"><?= __("Callsign"); ?></label>&nbsp;<i id="check_cluster" data-bs-toggle="tooltip" title="<?= __("Search DXCluster for latest Spot"); ?>" class="fas fa-search"></i>
+                  <label for="callsign"><?= __("Callsign"); ?></label>&nbsp;<i id="check_cluster" data-bs-toggle="tooltip" title="<?= __("Search DXCluster for latest Spot"); ?>" class="fas fa-search"></i></label>&nbsp;<i id="note_create_edit" data-bs-toggle="tooltip" title="<?= __("Create or edit note for this callsign"); ?>" class="fas fa-sticky-note text-secondary"></i>
                   <div class="input-group">
                     <input tabindex="7" type="text" class="form-control uppercase" id="callsign" name="callsign" autocomplete="off" required>
                     <span id="qrz_info" class="input-group-text btn-included-on-field d-none py-0"></span>
diff --git a/assets/js/sections/qso.js b/assets/js/sections/qso.js
index c363a4e92..71508290c 100644
--- a/assets/js/sections/qso.js
+++ b/assets/js/sections/qso.js
@@ -73,6 +73,15 @@ function getUTCDateStamp(el) {
 	$(el).attr('value', formatted_date);
 }
 
+// Note icon state logic
+function setNoteIconState(enabled) {
+	var $icon = $('#note_create_edit');
+	if (enabled) {
+		$icon.removeClass('text-secondary');
+	} else {
+		$icon.addClass('text-secondary');
+	}
+}
 
 $('#stationProfile').on('change', function () {
 	var stationProfile = $('#stationProfile').val();
@@ -399,7 +408,7 @@ function parseUserDate(user_provided_date) {	// creates JS-Date out of user-prov
 			month = parseInt(parts[1], 10) - 1;
 			year = parseInt(parts[2], 10);
 	}
-	if (isNaN(day) || day < 1 || day > 31 || isNaN(month) || month < 0 || month > 11 || isNaN(year)) return null; 
+	if (isNaN(day) || day < 1 || day > 31 || isNaN(month) || month < 0 || month > 11 || isNaN(year)) return null;
 	return new Date(year, month, day);
 }
 
@@ -891,6 +900,7 @@ function reset_fields() {
 	clearTimeout();
 	set_timers();
 	resetTimers(qso_manual);
+	setNoteIconState(false); // Always gray out note icon on reset
 }
 
 $("#callsign").on("focusout", function () {
@@ -921,6 +931,25 @@ $("#callsign").on("focusout", function () {
 		find_callsign = find_callsign.replaceAll('Ø', '0');
 		const url = `${base_url}index.php/logbook/json/${find_callsign}/${json_band}/${json_mode}/${stationProfile}/${startDate}/${last_qsos_count}`;
 
+		// Check note existence for this callsign
+		$.get(
+			window.base_url + 'index.php/notes/check_duplicate',
+			{
+				category: 'Contacts',
+				title: callsign
+			},
+			function(data) {
+				if (typeof data === 'string') {
+					try { data = JSON.parse(data); } catch (e) { data = {}; }
+				}
+				if (data && data.exists === true) {
+					setNoteIconState(true);
+				} else {
+					setNoteIconState(false);
+				}
+			}
+		);
+
 		// Replace / in a callsign with - to stop urls breaking
 		lookupCall = $.getJSON(url, async function (result) {
 
@@ -2173,6 +2202,8 @@ $(document).ready(function () {
 	set_timers();
 	updateStateDropdown('#dxcc_id', '#stateInputLabel', '#location_us_county', '#stationCntyInputQso');
 
+	setNoteIconState(false); /// Grey-out note icon
+
 	// Clear the localStorage for the qrg units, except the quicklogCallsign and a possible backlog
 	clearQrgUnits();
 	set_qrg();
@@ -2400,6 +2431,39 @@ $(document).ready(function () {
 		});
 	}
 
+	// Note create/edit icon click handler
+	$('#note_create_edit').on('click', function() {
+		var callsign = $('#callsign').val().trim();
+		if (!callsign) {
+			alert('Please enter a callsign first.');
+			return;
+		}
+		// AJAX to check if note exists for this callsign in Contacts category
+		$.get(
+			window.base_url + 'index.php/notes/check_duplicate',
+			{
+				category: 'Contacts',
+				title: callsign
+			},
+			function(data) {
+				// Defensive: try to parse if string
+				if (typeof data === 'string') {
+					try { data = JSON.parse(data); } catch (e) { data = {}; }
+				}
+				if (data && data.exists === true && data.id) {
+					window.open(window.base_url + 'index.php/notes/edit/' + data.id, '_blank');
+				} else if (data && data.exists === false) {
+					// Open add with prefilled title and Contacts category
+					var url = window.base_url + 'index.php/notes/add?title=' + encodeURIComponent(callsign) + '&category=Contacts';
+					window.open(url, '_blank');
+				} else {
+					// Unexpected response, show error
+					alert('Could not check note existence. Please try again.');
+				}
+			}
+		);
+	});
+
 	// everything loaded and ready 2 go
 	bc.postMessage('ready');
 });