diff --git a/public/app.js b/public/app.js
index 732d1b6..17d6ebe 100644
--- a/public/app.js
+++ b/public/app.js
@@ -428,6 +428,7 @@ function openNew() {
   document.getElementById('modal-label').textContent = 'Nouvelle idee';
   document.getElementById('f-title').value = '';
   renderModalTags(['À étudier']);
+  updateTagSuggestions();
   document.getElementById('f-tags-input').value = '';
   document.getElementById('f-acte').value = 'En attente';
   document.getElementById('f-resume').value = '';
@@ -452,6 +453,7 @@ function openEdit(id) {
   document.getElementById('modal-label').textContent = 'Modifier';
   document.getElementById('f-title').value = r.Title || '';
   renderModalTags((r.Tags || '').split(',').map(s => s.trim()).filter(Boolean));
+  updateTagSuggestions();
   document.getElementById('f-tags-input').value = '';
   document.getElementById('f-acte').value = r.Acte || '';
   document.getElementById('f-resume').value = r['Résumé'] || '';
@@ -579,6 +581,38 @@ function getModalTags() {
   return [...document.querySelectorAll('#f-tags .tag-chip')].map(c => c.dataset.tag);
 }
 
+function collectExistingTags() {
+  const tagSet = new Set();
+  records.forEach(r => {
+    if (r.Tags) r.Tags.split(',').forEach(t => { const trimmed = t.trim(); if (trimmed) tagSet.add(trimmed); });
+  });
+  return [...tagSet].sort((a, b) => a.localeCompare(b, 'fr'));
+}
+
+function updateTagSuggestions() {
+  const select = document.getElementById('f-tags-select');
+  const current = getModalTags();
+  const existing = collectExistingTags().filter(t => !current.includes(t));
+  select.innerHTML = '<option value="">Tags existants...</option>';
+  existing.forEach(t => {
+    const opt = document.createElement('option');
+    opt.value = t; opt.textContent = t;
+    select.appendChild(opt);
+  });
+}
+
+function addExistingTag() {
+  const select = document.getElementById('f-tags-select');
+  const val = select.value;
+  if (!val) return;
+  const current = getModalTags();
+  if (!current.includes(val)) {
+    renderModalTags([...current, val]);
+  }
+  select.value = '';
+  updateTagSuggestions();
+}
+
 function renderModalTags(tags) {
   const container = document.getElementById('f-tags');
   container.querySelectorAll('.tag-chip').forEach(c => c.remove());
@@ -587,7 +621,7 @@ function renderModalTags(tags) {
     const chip = document.createElement('span');
     chip.className = 'tag-chip';
     chip.dataset.tag = tag;
-    chip.innerHTML = `${esc(tag)}<span class="tag-chip-remove" onclick="this.parentElement.remove()">&times;</span>`;
+    chip.innerHTML = `${esc(tag)}<span class="tag-chip-remove" onclick="this.parentElement.remove(); updateTagSuggestions();">&times;</span>`;
     container.insertBefore(chip, input);
   });
 }
@@ -601,6 +635,7 @@ function addTag() {
     renderModalTags([...current, val]);
   }
   input.value = '';
+  updateTagSuggestions();
 }
 
 document.getElementById('modal').addEventListener('click', e => {
diff --git a/public/index.html b/public/index.html
index c5a025d..6b64edc 100644
--- a/public/index.html
+++ b/public/index.html
@@ -256,7 +256,10 @@ window.dispatchEvent(new Event('tiptap-loaded'));
       <div class="field">
         <label>Tags</label>
         <div class="tags-input-container" id="f-tags">
-          <input type="text" class="tags-input" id="f-tags-input" placeholder="Ajouter un tag..." onkeydown="if(event.key==='Enter'){event.preventDefault();addTag()}">
+          <input type="text" class="tags-input" id="f-tags-input" placeholder="Ajouter un tag..." onkeydown="if(event.key==='Enter'){event.preventDefault();addTag()}" oninput="updateTagSuggestions()" onfocus="updateTagSuggestions()">
+          <select class="tags-existing-select" id="f-tags-select" onchange="addExistingTag()">
+            <option value="">Tags existants...</option>
+          </select>
         </div>
       </div>
       <div class="field-row">
diff --git a/public/styles.css b/public/styles.css
index af8030e..a72aef6 100644
--- a/public/styles.css
+++ b/public/styles.css
@@ -196,7 +196,9 @@
   .tags-input-container { display: flex; flex-wrap: wrap; gap: 6px; padding: 6px 8px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-input); align-items: center; min-height: 36px; }
   .tags-input-container:focus-within { border-color: var(--accent); }
   .tags-input { border: none; outline: none; font-size: 13px; font-family: 'Lora', serif; color: var(--text); background: transparent; flex: 1; min-width: 80px; padding: 2px 0; }
-  .tag-chip { display: inline-flex; align-items: center; gap: 4px; padding: 3px 8px; background: #ede8e0; color: #6b5a4a; border-radius: 6px; font-size: 12px; font-family: 'Lora', serif; }
+  .tags-existing-select { border: none; outline: none; font-size: 12px; font-family: 'Lora', serif; color: var(--text-muted); background: transparent; cursor: pointer; padding: 2px 8px; border-left: 1px dashed var(--border); }
+  .tags-existing-select:focus { color: var(--text); }
+  .tags-input-container .tag-chip { display: inline-flex; align-items: center; gap: 4px; padding: 3px 8px; background: #ede8e0; color: #6b5a4a; border-radius: 6px; font-size: 12px; font-family: 'Lora', serif; }
   .dark .tag-chip { background: #3a3020; color: #c4a870; }
   .tag-chip-remove { cursor: pointer; font-size: 14px; line-height: 1; opacity: 0.6; }
   .tag-chip-remove:hover { opacity: 1; }