diff --git a/blueprints/community/classifieds/routes.py b/blueprints/community/classifieds/routes.py
index 948515b..a203f07 100644
--- a/blueprints/community/classifieds/routes.py
+++ b/blueprints/community/classifieds/routes.py
@@ -116,6 +116,18 @@ def new():
             ).first():
                 form_company_id = current_user.company_id
 
+            # Deduplikacja double/triple-click: jeśli ten sam autor+firma+tytuł
+            # wpadły w ostatnich 60 sekundach — traktuj jako powtórkę przesyłu formularza.
+            recent_duplicate = db.query(Classified).filter(
+                Classified.author_id == current_user.id,
+                Classified.company_id == form_company_id,
+                Classified.title == title,
+                Classified.created_at >= datetime.now() - timedelta(seconds=60),
+            ).order_by(Classified.created_at.desc()).first()
+            if recent_duplicate:
+                flash('To ogłoszenie właśnie dodano — wyświetlamy istniejące.', 'info')
+                return redirect(url_for('.classifieds_view', classified_id=recent_duplicate.id))
+
             classified = Classified(
                 author_id=current_user.id,
                 company_id=form_company_id,
diff --git a/templates/admin/announcements_form.html b/templates/admin/announcements_form.html
index ff068b0..0406270 100755
--- a/templates/admin/announcements_form.html
+++ b/templates/admin/announcements_form.html
@@ -169,7 +169,7 @@
     {% endif %}
 
     <div class="form-section">
-        <form method="POST">
+        <form method="POST" id="announcementForm">
             <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
 
             <!-- Basic Info -->
@@ -301,6 +301,24 @@
 {% endblock %}
 
 {% block extra_js %}
+    // Anty double/triple-click — blokada wielokrotnego submitu
+    (function() {
+        const form = document.getElementById('announcementForm');
+        if (!form) return;
+        form.addEventListener('submit', function(e) {
+            const btns = form.querySelectorAll('button[type="submit"]');
+            if (Array.from(btns).some(function(b) { return b.disabled; })) {
+                e.preventDefault();
+                return;
+            }
+            btns.forEach(function(b) {
+                b.dataset.originalText = b.textContent.trim();
+                b.disabled = true;
+                b.textContent = 'Wysyłanie...';
+            });
+        });
+    })();
+
     // Character counter for excerpt
     const excerptTextarea = document.getElementById('excerpt');
     const excerptCounter = document.getElementById('excerpt-counter');
diff --git a/templates/board/meeting_form.html b/templates/board/meeting_form.html
index 5aae377..70b93ab 100644
--- a/templates/board/meeting_form.html
+++ b/templates/board/meeting_form.html
@@ -723,6 +723,24 @@
 {% endblock %}
 
 {% block extra_js %}
+// Anty double/triple-click — blokada wielokrotnego submitu
+(function() {
+    const form = document.getElementById('meetingForm');
+    if (!form) return;
+    form.addEventListener('submit', function(e) {
+        const btns = form.querySelectorAll('button[type="submit"]');
+        if (Array.from(btns).some(function(b) { return b.disabled; })) {
+            e.preventDefault();
+            return;
+        }
+        btns.forEach(function(b) {
+            b.dataset.originalText = b.innerHTML;
+            b.disabled = true;
+            b.textContent = 'Wysyłanie...';
+        });
+    });
+})();
+
 // Tab switching
 document.querySelectorAll('.form-tab').forEach(tab => {
     tab.addEventListener('click', function() {
diff --git a/templates/classifieds/new.html b/templates/classifieds/new.html
index 81df2f2..2330a68 100755
--- a/templates/classifieds/new.html
+++ b/templates/classifieds/new.html
@@ -435,7 +435,13 @@ var quill = new Quill('#quill-editor', {
     // their green check immediately on page load.
     refreshTitle(); refreshCat(); refreshRadios(); refreshDesc();
 
+    var submitBtn = document.getElementById('submitBtn');
     document.getElementById('classifiedForm').addEventListener('submit', function(e) {
+        // Anty double/triple-click — jeśli już wysyłamy, blokuj kolejny submit
+        if (submitBtn && submitBtn.disabled) {
+            e.preventDefault();
+            return;
+        }
         var html = quill.root.innerHTML;
         var empty = (html === '<p><br></p>' || quill.getText().trim() === '');
         if (empty) {
@@ -447,6 +453,10 @@ var quill = new Quill('#quill-editor', {
         }
         qc && qc.classList.remove('field-error');
         document.getElementById('description').value = html;
+        if (submitBtn) {
+            submitBtn.disabled = true;
+            submitBtn.textContent = 'Wysyłanie...';
+        }
     });
 })();
 
@@ -565,7 +575,11 @@ var quill = new Quill('#quill-editor', {
         filesMap.forEach(file => formData.append('attachments[]', file));
         fetch(form.action, { method: 'POST', body: formData })
             .then(resp => { if (resp.redirected) { window.location.href = resp.url; } else { window.location.reload(); } })
-            .catch(() => alert('Błąd wysyłania'));
+            .catch(() => {
+                alert('Błąd wysyłania');
+                var btn = document.getElementById('submitBtn');
+                if (btn) { btn.disabled = false; btn.textContent = 'Dodaj ogłoszenie'; }
+            });
     });
 
     function formatFileSize(bytes) {