diff --git a/memento-note/app/api/ai/organize-notebook/route.ts b/memento-note/app/api/ai/organize-notebook/route.ts
new file mode 100644
index 0000000..3edf308
--- /dev/null
+++ b/memento-note/app/api/ai/organize-notebook/route.ts
@@ -0,0 +1,57 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { auth } from '@/auth'
+import prisma from '@/lib/prisma'
+import { notebookOrganizerService } from '@/lib/ai/services/notebook-organizer.service'
+import { checkEntitlementOrThrow, QuotaExceededError, incrementUsageAsync } from '@/lib/entitlements'
+
+export async function POST(request: NextRequest) {
+  try {
+    const session = await auth()
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    const { notebookId } = await request.json()
+    if (!notebookId) {
+      return NextResponse.json({ error: 'notebookId is required' }, { status: 400 })
+    }
+
+    try {
+      await checkEntitlementOrThrow(session.user.id, 'reformulate')
+    } catch (err) {
+      if (err instanceof QuotaExceededError) {
+        const isTierLocked = err.currentQuota === 0
+        return NextResponse.json(
+          { error: isTierLocked ? 'feature_locked' : 'quota_exceeded', errorKey: isTierLocked ? 'ai.featureLocked' : 'ai.quotaExceeded' },
+          { status: 402 },
+        )
+      }
+      throw err
+    }
+
+    const notes = await prisma.note.findMany({
+      where: { notebookId, trashedAt: null, userId: session.user.id },
+      select: { id: true, title: true, content: true },
+      orderBy: { order: 'asc' },
+    })
+
+    if (notes.length < 2) {
+      return NextResponse.json({ error: 'Need at least 2 notes to organize' }, { status: 400 })
+    }
+
+    const notesForAnalysis = notes.map(n => ({
+      id: n.id,
+      title: n.title || 'Sans titre',
+      contentPreview: n.content.replace(/<[^>]+>/g, ' ').replace(/\s+/g, ' ').trim().slice(0, 300),
+    }))
+
+    const result = await notebookOrganizerService.analyze(notesForAnalysis)
+
+    incrementUsageAsync(session.user.id, 'reformulate')
+
+    return NextResponse.json(result)
+  } catch (error: any) {
+    console.error('[Notebook Organizer] Error:', error)
+    return NextResponse.json({ error: error.message || 'Failed to organize notebook' }, { status: 500 })
+  }
+}
diff --git a/memento-note/components/home-client.tsx b/memento-note/components/home-client.tsx
index 9661c55..d1a68cc 100644
--- a/memento-note/components/home-client.tsx
+++ b/memento-note/components/home-client.tsx
@@ -20,7 +20,7 @@ import {
 
 import { NotebookSuggestionToast } from '@/components/notebook-suggestion-toast'
 import { Button } from '@/components/ui/button'
-import { Plus, ArrowUpDown, Search, Sparkles, FileText, FolderOpen, ChevronRight, Tag as TagIcon, X, Menu, LayoutGrid, List, Table, Columns3, CalendarDays } from 'lucide-react'
+import { Plus, ArrowUpDown, Search, Sparkles, FileText, FolderOpen, ChevronRight, Tag as TagIcon, X, Menu, LayoutGrid, List, Table, Columns3, CalendarDays, Wand2 } from 'lucide-react'
 import { emitNoteChange } from '@/lib/note-change-sync'
 import { useReminderCheck } from '@/hooks/use-reminder-check'
 import { useAutoLabelSuggestion } from '@/hooks/use-auto-label-suggestion'
@@ -31,6 +31,7 @@ import { useEditorUI } from '@/context/editor-ui-context'
 import { NoteHistoryModal } from '@/components/note-history-modal'
 import { CreateNotebookDialog } from '@/components/create-notebook-dialog'
 import { StudyPlannerDialog } from '@/components/wizard/study-planner-dialog'
+import { NotebookOrganizerDialog } from '@/components/wizard/notebook-organizer-dialog'
 import { toast } from 'sonner'
 import { AnimatePresence, motion } from 'motion/react'
 
@@ -136,6 +137,7 @@ export function HomeClient({
   const [addPropertyOpen, setAddPropertyOpen] = useState(false)
   const [isEnablingStructured, setIsEnablingStructured] = useState(false)
   const [showStudyPlanner, setShowStudyPlanner] = useState(false)
+  const [showOrganizer, setShowOrganizer] = useState(false)
 
   const notebookFilter = searchParams.get('notebook')
   const schemaHook = useNotebookSchema(notebookFilter)
@@ -1051,6 +1053,19 @@ export function HomeClient({
                     <span>{t('wizard.studyPlanner') || 'Planning'}</span>
                   </button>
                 )}
+                {searchParams.get('notebook') && (
+                  <button
+                    onClick={() => setShowOrganizer(true)}
+                    disabled={!initialSettings.aiAssistantEnabled}
+                    className={cn(
+                      "flex items-center gap-2 text-[13px] font-medium transition-opacity",
+                      initialSettings.aiAssistantEnabled ? "text-brand-accent hover:opacity-70" : "text-muted-foreground opacity-50 cursor-not-allowed"
+                    )}
+                  >
+                    <Wand2 size={16} />
+                    <span>{t('wizard.organizer') || 'Organiser'}</span>
+                  </button>
+                )}
                 <button
                   onClick={() => setSortOrder(s => s === 'newest' ? 'oldest' : s === 'oldest' ? 'alpha' : s === 'alpha' ? 'manual' : 'newest')}
                   className="flex items-center gap-2 text-[13px] text-foreground font-medium hover:opacity-70 transition-opacity"
@@ -1292,6 +1307,14 @@ export function HomeClient({
           onClose={() => setShowStudyPlanner(false)}
         />
       )}
+
+      {showOrganizer && currentNotebook && (
+        <NotebookOrganizerDialog
+          notebookId={currentNotebook.id}
+          notebookName={currentNotebook.name}
+          onClose={() => setShowOrganizer(false)}
+        />
+      )}
     </div>
   )
 }
diff --git a/memento-note/components/wizard/notebook-organizer-dialog.tsx b/memento-note/components/wizard/notebook-organizer-dialog.tsx
new file mode 100644
index 0000000..1a6feb1
--- /dev/null
+++ b/memento-note/components/wizard/notebook-organizer-dialog.tsx
@@ -0,0 +1,196 @@
+'use client'
+
+import { useState } from 'react'
+import { Sparkles, Loader2, X, Tag, Copy, FolderTree, AlertTriangle, Check } from 'lucide-react'
+import { useLanguage } from '@/lib/i18n'
+import { cn } from '@/lib/utils'
+import { toast } from 'sonner'
+
+interface SuggestedTag { name: string; noteIds: string[] }
+interface Duplicate { note1Id: string; note1Title: string; note2Id: string; note2Title: string; reason: string }
+interface Category { name: string; noteIds: string[]; noteTitles: string[] }
+interface OrgResult {
+  suggestedTags: SuggestedTag[]
+  duplicates: Duplicate[]
+  categories: Category[]
+  summary: string
+}
+
+export function NotebookOrganizerDialog({
+  notebookId,
+  notebookName,
+  onClose,
+}: {
+  notebookId: string
+  notebookName: string
+  onClose: () => void
+}) {
+  const { t } = useLanguage()
+  const [loading, setLoading] = useState(false)
+  const [result, setResult] = useState<OrgResult | null>(null)
+  const [appliedTags, setAppliedTags] = useState<Set<string>>(new Set())
+
+  const handleAnalyze = async () => {
+    setLoading(true)
+    try {
+      const res = await fetch('/api/ai/organize-notebook', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ notebookId }),
+      })
+      const data = await res.json()
+      if (!res.ok) {
+        toast.error(data.errorKey === 'ai.featureLocked' ? (t('ai.featureLocked') || 'Plan requis') : (data.error || 'Erreur'))
+      } else {
+        setResult(data)
+      }
+    } catch (e: any) {
+      toast.error(e.message || 'Erreur')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  const applyTag = async (tagName: string, noteIds: string[]) => {
+    try {
+      for (const noteId of noteIds) {
+        await fetch(`/api/notes/${noteId}/properties`, {
+          method: 'PATCH',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({ tags: [tagName] }),
+        }).catch(() => {})
+      }
+      setAppliedTags(prev => new Set(prev).add(tagName))
+      toast.success(t('wizard.tagApplied') || `Tag "${tagName}" appliqué à ${noteIds.length} notes`)
+    } catch {
+      toast.error('Erreur')
+    }
+  }
+
+  return (
+    <div className="fixed inset-0 z-[300] flex items-center justify-center p-4 bg-black/50 backdrop-blur-sm" dir="auto" onClick={onClose}>
+      <div className="w-full max-w-2xl max-h-[85vh] rounded-2xl border border-border bg-card shadow-2xl overflow-hidden flex flex-col" onClick={(e) => e.stopPropagation()}>
+        <div className="flex items-center justify-between px-6 py-4 border-b border-border/50 bg-brand-accent/5 shrink-0">
+          <div className="flex items-center gap-2">
+            <Sparkles className="h-5 w-5 text-brand-accent" />
+            <h2 className="text-base font-semibold">{t('wizard.organizer') || 'Organiser avec l\'IA'}</h2>
+          </div>
+          <button onClick={onClose} className="p-1 rounded-lg hover:bg-muted text-muted-foreground">
+            <X className="h-5 w-5" />
+          </button>
+        </div>
+
+        <div className="p-6 overflow-y-auto flex-1">
+          {!result && !loading && (
+            <div className="space-y-4">
+              <p className="text-sm text-muted-foreground">
+                {t('wizard.organizerDesc') || `L'IA va analyser toutes les notes du carnet "${notebookName}" et proposer : tags, regroupements, et détection de doublons.`}
+              </p>
+              <button
+                onClick={handleAnalyze}
+                className="w-full flex items-center justify-center gap-2 px-4 py-3 text-sm rounded-lg bg-brand-accent text-white hover:bg-brand-accent/90 transition-colors font-medium"
+              >
+                <Sparkles className="h-4 w-4" />
+                {t('wizard.analyze') || 'Analyser le carnet'}
+              </button>
+            </div>
+          )}
+
+          {loading && (
+            <div className="flex flex-col items-center justify-center py-12 gap-3">
+              <Loader2 className="h-8 w-8 animate-spin text-brand-accent" />
+              <p className="text-sm text-muted-foreground">{t('wizard.organizing') || 'Analyse des notes...'}</p>
+            </div>
+          )}
+
+          {result && (
+            <div className="space-y-6">
+              {/* Summary */}
+              <div className="rounded-lg bg-muted/30 p-4">
+                <p className="text-sm leading-relaxed">{result.summary}</p>
+              </div>
+
+              {/* Tags */}
+              {result.suggestedTags.length > 0 && (
+                <div className="space-y-2">
+                  <h3 className="text-[10px] uppercase tracking-widest font-bold text-muted-foreground flex items-center gap-1.5">
+                    <Tag size={12} /> {t('wizard.suggestedTags') || 'Tags suggérés'}
+                  </h3>
+                  {result.suggestedTags.map((tag, i) => (
+                    <div key={i} className="flex items-center justify-between p-3 rounded-lg border border-border/50 hover:bg-muted/20">
+                      <div className="flex items-center gap-2">
+                        <span className="px-2 py-0.5 rounded-full bg-brand-accent/10 text-brand-accent text-xs font-medium">
+                          {tag.name}
+                        </span>
+                        <span className="text-[10px] text-muted-foreground">{tag.noteIds.length} notes</span>
+                      </div>
+                      <button
+                        onClick={() => applyTag(tag.name, tag.noteIds)}
+                        disabled={appliedTags.has(tag.name)}
+                        className={cn(
+                          'px-2 py-1 text-[10px] rounded-md font-medium transition-colors',
+                          appliedTags.has(tag.name)
+                            ? 'bg-green-100 text-green-700 dark:bg-green-950/30 dark:text-green-400'
+                            : 'bg-foreground/5 hover:bg-foreground/10 text-foreground'
+                        )}
+                      >
+                        {appliedTags.has(tag.name) ? (<><Check size={10} className="inline" /> Appliqué</>) : (t('wizard.apply') || 'Appliquer')}
+                      </button>
+                    </div>
+                  ))}
+                </div>
+              )}
+
+              {/* Categories */}
+              {result.categories.length > 0 && (
+                <div className="space-y-2">
+                  <h3 className="text-[10px] uppercase tracking-widest font-bold text-muted-foreground flex items-center gap-1.5">
+                    <FolderTree size={12} /> {t('wizard.categories') || 'Regroupements suggérés'}
+                  </h3>
+                  {result.categories.map((cat, i) => (
+                    <div key={i} className="p-3 rounded-lg border border-border/50">
+                      <div className="text-sm font-medium mb-1">{cat.name}</div>
+                      <div className="flex flex-wrap gap-1">
+                        {cat.noteTitles.map((title, j) => (
+                          <span key={j} className="text-[10px] px-1.5 py-0.5 rounded-full bg-muted text-muted-foreground">
+                            {title.length > 35 ? title.slice(0, 35) + '...' : title}
+                          </span>
+                        ))}
+                      </div>
+                    </div>
+                  ))}
+                </div>
+              )}
+
+              {/* Duplicates */}
+              {result.duplicates.length > 0 && (
+                <div className="space-y-2">
+                  <h3 className="text-[10px] uppercase tracking-widest font-bold text-muted-foreground flex items-center gap-1.5">
+                    <AlertTriangle size={12} className="text-amber-500" /> {t('wizard.duplicates') || 'Doublons détectés'}
+                  </h3>
+                  {result.duplicates.map((dup, i) => (
+                    <div key={i} className="p-3 rounded-lg border border-amber-200 dark:border-amber-900/50 bg-amber-50/50 dark:bg-amber-950/20">
+                      <div className="flex items-center gap-2 mb-1">
+                        <Copy size={12} className="text-amber-500" />
+                        <span className="text-xs font-medium">{dup.note1Title}</span>
+                        <span className="text-[10px] text-muted-foreground">≈</span>
+                        <span className="text-xs font-medium">{dup.note2Title}</span>
+                      </div>
+                      <p className="text-[10px] text-muted-foreground italic">{dup.reason}</p>
+                    </div>
+                  ))}
+                </div>
+              )}
+
+              {result.suggestedTags.length === 0 && result.duplicates.length === 0 && result.categories.length === 0 && (
+                <p className="text-sm text-muted-foreground text-center py-4">
+                  {t('wizard.noSuggestions') || 'Aucune suggestion — le carnet semble bien organisé.'}
+                </p>
+              )}
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
diff --git a/memento-note/lib/ai/services/notebook-organizer.service.ts b/memento-note/lib/ai/services/notebook-organizer.service.ts
new file mode 100644
index 0000000..18bbbde
--- /dev/null
+++ b/memento-note/lib/ai/services/notebook-organizer.service.ts
@@ -0,0 +1,104 @@
+import { getChatProvider } from '../factory'
+import { getSystemConfig } from '@/lib/config'
+
+export interface OrganizationSuggestion {
+  suggestedTags: Array<{ name: string; noteIds: string[] }>
+  duplicates: Array<{ note1Id: string; note1Title: string; note2Id: string; note2Title: string; reason: string }>
+  categories: Array<{ name: string; noteIds: string[]; noteTitles: string[] }>
+  summary: string
+}
+
+export class NotebookOrganizerService {
+  async analyze(
+    notes: Array<{ id: string; title: string; contentPreview: string }>,
+    language?: string
+  ): Promise<OrganizationSuggestion> {
+    const lang = language || 'fr'
+    const langName = lang === 'fr' ? 'français' : lang === 'fa' ? 'فارسی' : 'English'
+
+    const notesList = notes.map(n =>
+      `ID: ${n.id}\nTitre: ${n.title}\nAperçu: ${n.contentPreview.slice(0, 200)}`
+    ).join('\n---\n')
+
+    const prompt = `Tu es un expert en organisation de connaissances. Analyse ces notes et propose une organisation.
+
+LANGUE : ${langName}
+
+NOTES DANS LE CARNET :
+${notesList}
+
+Analyse les notes et retourne :
+
+1. **suggestedTags** — Tags pertinents à appliquer (3-8 tags). Pour chaque tag, liste les IDs des notes qui correspondent.
+2. **duplicates** — Notes qui se chevauchent ou répètent la même information. Pour chaque paire, explique pourquoi.
+3. **categories** — Regroupements logiques (2-5 catégories). Pour chaque catégorie, liste les IDs et titres des notes.
+4. **summary** — Un résumé court de l'état du carnet et des recommandations.
+
+FORMAT JSON UNIQUEMENT :
+\`\`\`json
+{
+  "suggestedTags": [
+    { "name": "nom-du-tag", "noteIds": ["id1", "id2"] }
+  ],
+  "duplicates": [
+    { "note1Id": "id1", "note1Title": "...", "note2Id": "id2", "note2Title": "...", "reason": "..." }
+  ],
+  "categories": [
+    { "name": "Nom catégorie", "noteIds": ["id1"], "noteTitles": ["Titre"] }
+  ],
+  "summary": "Résumé court..."
+}
+\`\`\`
+
+Si aucune note en double n'est trouvée, retourne un array vide pour "duplicates".`
+
+    const config = await getSystemConfig()
+    const provider = getChatProvider(config)
+    const raw = await provider.generateText(prompt)
+
+    return this.parseResponse(raw)
+  }
+
+  private parseResponse(raw: string): OrganizationSuggestion {
+    const jsonMatch = raw.match(/```json\s*([\s\S]+?)\s*```/)
+    let jsonStr = jsonMatch ? jsonMatch[1] : raw
+
+    const start = jsonStr.indexOf('{')
+    const end = jsonStr.lastIndexOf('}')
+    if (start >= 0 && end > start) {
+      jsonStr = jsonStr.slice(start, end + 1)
+    }
+
+    try {
+      const parsed = JSON.parse(jsonStr)
+      return {
+        suggestedTags: (parsed.suggestedTags || []).map((t: any) => ({
+          name: String(t.name || ''),
+          noteIds: Array.isArray(t.noteIds) ? t.noteIds.map(String) : [],
+        })),
+        duplicates: (parsed.duplicates || []).map((d: any) => ({
+          note1Id: String(d.note1Id || ''),
+          note1Title: String(d.note1Title || ''),
+          note2Id: String(d.note2Id || ''),
+          note2Title: String(d.note2Title || ''),
+          reason: String(d.reason || ''),
+        })),
+        categories: (parsed.categories || []).map((c: any) => ({
+          name: String(c.name || ''),
+          noteIds: Array.isArray(c.noteIds) ? c.noteIds.map(String) : [],
+          noteTitles: Array.isArray(c.noteTitles) ? c.noteTitles.map(String) : [],
+        })),
+        summary: String(parsed.summary || ''),
+      }
+    } catch {
+      return {
+        suggestedTags: [],
+        duplicates: [],
+        categories: [],
+        summary: 'Analyse impossible — réessayer plus tard.',
+      }
+    }
+  }
+}
+
+export const notebookOrganizerService = new NotebookOrganizerService()
diff --git a/memento-note/locales/en.json b/memento-note/locales/en.json
index 8cc66c8..5b32cac 100644
--- a/memento-note/locales/en.json
+++ b/memento-note/locales/en.json
@@ -2575,6 +2575,16 @@
     "wizardStudyPlanSuccess": "Plan created! Reminders have been added to your notes.",
     "wizardDaysPlanned": "days planned",
     "wizardStudyPlanReminders": "Reminders have been automatically added to your notes.",
+    "wizardOrganizer": "Organize with AI",
+    "wizardOrganizerDesc": "AI analyzes your notes and suggests tags, groupings and duplicate detection.",
+    "wizardAnalyze": "Analyze notebook",
+    "wizardOrganizing": "Analyzing notes...",
+    "wizardSuggestedTags": "Suggested tags",
+    "wizardCategories": "Suggested groupings",
+    "wizardDuplicates": "Duplicates detected",
+    "wizardApply": "Apply",
+    "wizardTagApplied": "applied",
+    "wizardNoSuggestions": "No suggestions — notebook looks well organized.",
     "importMarkdown": "Import Markdown",
     "markdownExportSuccess": "Note exported as Markdown",
     "markdownExportError": "Failed to export note",
diff --git a/memento-note/locales/fr.json b/memento-note/locales/fr.json
index 2afb6ac..43ce987 100644
--- a/memento-note/locales/fr.json
+++ b/memento-note/locales/fr.json
@@ -2579,6 +2579,16 @@
     "wizardStudyPlanSuccess": "Planning créé ! Des rappels ont été ajoutés à vos notes.",
     "wizardDaysPlanned": "jours planifiés",
     "wizardStudyPlanReminders": "Des rappels ont été ajoutés automatiquement à vos notes.",
+    "wizardOrganizer": "Organiser avec l'IA",
+    "wizardOrganizerDesc": "L'IA analyse vos notes et propose tags, regroupements et détection de doublons.",
+    "wizardAnalyze": "Analyser le carnet",
+    "wizardOrganizing": "Analyse des notes en cours...",
+    "wizardSuggestedTags": "Tags suggérés",
+    "wizardCategories": "Regroupements suggérés",
+    "wizardDuplicates": "Doublons détectés",
+    "wizardApply": "Appliquer",
+    "wizardTagApplied": "appliqué",
+    "wizardNoSuggestions": "Aucune suggestion — le carnet semble bien organisé.",
     "importMarkdown": "Importer un Markdown",
     "markdownExportSuccess": "Note exportée en Markdown",
     "markdownExportError": "Échec de l'export de la note",