diff --git a/frontend/src/app/platform/ProjectsPage.tsx b/frontend/src/app/platform/ProjectsPage.tsx
index 986f688..62c7cdd 100644
--- a/frontend/src/app/platform/ProjectsPage.tsx
+++ b/frontend/src/app/platform/ProjectsPage.tsx
@@ -18,6 +18,7 @@ import {
   DropdownMenu,
   DropdownMenuContent,
   DropdownMenuItem,
+  DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from '@/components/ui/dropdown-menu'
 import {
@@ -51,12 +52,14 @@ import {
   ArrowUp,
   ArrowDown,
   X,
+  Copy,
 } from 'lucide-react'
 import { Checkbox } from '@/components/ui/checkbox'
 import { usePlatform } from './platformContext'
 import { getProjectIcon } from '../../lib/iconMap'
 import {
   loadGraphFromStorage,
+  saveGraphToStorage,
   removeGraphFromStorage,
   PROJECT_FILE_EXT,
   PROJECT_VERSION,
@@ -195,6 +198,55 @@ function GraphThumbnail({ projectId, className }: { projectId: string; className
   )
 }
 
+type ProjectActionsMenuProps = {
+  project: Project
+  onOpen: (id: string) => void
+  onRenameOpen: (project: Project) => void
+  onDuplicateOpen: (project: Project) => void
+  onExport: (project: Project) => void
+  onDeleteOpen: (project: Project) => void
+  trigger: React.ReactNode
+}
+
+function ProjectActionsMenu({
+  project,
+  onOpen,
+  onRenameOpen,
+  onDuplicateOpen,
+  onExport,
+  onDeleteOpen,
+  trigger,
+}: ProjectActionsMenuProps) {
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>{trigger}</DropdownMenuTrigger>
+      <DropdownMenuContent align="end">
+        <DropdownMenuItem onClick={() => onOpen(project.id)}>
+          <FolderOpen className="size-4" />
+          Open
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => onRenameOpen(project)}>
+          <Pencil className="size-4" />
+          Rename
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => onDuplicateOpen(project)}>
+          <Copy className="size-4" />
+          Duplicate
+        </DropdownMenuItem>
+        <DropdownMenuItem onClick={() => onExport(project)}>
+          <Download className="size-4" />
+          Export
+        </DropdownMenuItem>
+        <DropdownMenuSeparator />
+        <DropdownMenuItem className="text-destructive focus:text-destructive" onClick={() => onDeleteOpen(project)}>
+          <Trash2 className="size-4" />
+          Delete
+        </DropdownMenuItem>
+      </DropdownMenuContent>
+    </DropdownMenu>
+  )
+}
+
 export type ViewMode = 'table' | 'cards'
 
 export function ProjectsPage() {
@@ -210,6 +262,9 @@ export function ProjectsPage() {
   const [renameValue, setRenameValue] = useState('')
   const renameInputRef = React.useRef<HTMLInputElement>(null)
   const [deleteTarget, setDeleteTarget] = useState<Project | null>(null)
+  const [duplicateTarget, setDuplicateTarget] = useState<Project | null>(null)
+  const [duplicateName, setDuplicateName] = useState('')
+  const duplicateInputRef = React.useRef<HTMLInputElement>(null)
   const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set())
   const [bulkDeleteTargets, setBulkDeleteTargets] = useState<Project[] | null>(null)
 
@@ -266,6 +321,13 @@ export function ProjectsPage() {
     }
   }, [renameTarget])
 
+  React.useEffect(() => {
+    if (duplicateTarget) {
+      const t = setTimeout(() => duplicateInputRef.current?.focus(), 0)
+      return () => clearTimeout(t)
+    }
+  }, [duplicateTarget])
+
   const handleRenameSubmit = useCallback(() => {
     if (renameTarget && renameValue.trim()) {
       renameProject(renameTarget.id, renameValue.trim())
@@ -326,6 +388,33 @@ export function ProjectsPage() {
     [createProject, navigate]
   )
 
+  const handleDuplicateOpen = useCallback((project: Project) => {
+    setDuplicateTarget(project)
+    setDuplicateName(`${project.name} (copy)`)
+  }, [])
+
+  const handleDuplicateConfirm = useCallback(() => {
+    if (!duplicateTarget || !duplicateName.trim()) return
+    const name = duplicateName.trim()
+    const newId = `proj_${Date.now()}_${Math.random().toString(36).slice(2, 6)}`
+    const now = Date.now()
+    const newProject: Project = {
+      id: newId,
+      name,
+      iconId: duplicateTarget.iconId,
+      createdAt: now,
+      lastEditedAt: now,
+    }
+    createProject(newProject)
+    const graph = loadGraphFromStorage(duplicateTarget.id)
+    if (graph && (graph.nodes.length > 0 || graph.edges.length > 0)) {
+      saveGraphToStorage(newId, { version: PROJECT_VERSION, nodes: graph.nodes, edges: graph.edges })
+    }
+    toast.success('Project duplicated')
+    setDuplicateTarget(null)
+    setDuplicateName('')
+  }, [duplicateTarget, duplicateName, createProject])
+
   const allOnPageSelected = pageItems.length > 0 && pageItems.every((p) => selectedIds.has(p.id))
   const someOnPageSelected = pageItems.some((p) => selectedIds.has(p.id))
 
@@ -561,9 +650,7 @@ export function ProjectsPage() {
                           <SortIcon columnKey="lastEdited" />
                         </button>
                       </TableHead>
-                      <TableHead className="sticky right-0 z-10 w-[140px] min-w-[140px] bg-card h-8 px-2 py-1.5 text-xs font-medium">
-                        Actions
-                      </TableHead>
+                      <TableHead className="sticky right-0 z-10 w-12 min-w-12 bg-card h-8 px-1 py-1.5 text-xs font-medium" />
                     </TableRow>
                   </TableHeader>
                   <TableBody className="text-xs">
@@ -617,67 +704,22 @@ export function ProjectsPage() {
                             </Tooltip>
                           </TableCell>
                           <TableCell
-                            className={`sticky right-0 w-[140px] min-w-[140px] px-2 py-1.5 ${isSelected ? 'bg-muted/70' : 'bg-card group-hover:bg-muted/50'}`}
+                            className={`sticky right-0 w-12 min-w-12 px-1 py-1.5 ${isSelected ? 'bg-muted/70' : 'bg-card group-hover:bg-muted/50'}`}
                             onClick={(e) => e.stopPropagation()}
                           >
-                            <div className="flex items-center justify-end gap-0.5">
-                              <Tooltip>
-                                <TooltipTrigger asChild>
-                                  <Button
-                                    variant="ghost"
-                                    size="icon"
-                                    className="size-7 text-muted-foreground hover:text-foreground"
-                                    aria-label={`Open ${project.name}`}
-                                    onClick={() => handleOpen(project.id)}
-                                  >
-                                    <FolderOpen className="size-3.5" />
-                                  </Button>
-                                </TooltipTrigger>
-                                <TooltipContent>Open</TooltipContent>
-                              </Tooltip>
-                              <Tooltip>
-                                <TooltipTrigger asChild>
-                                  <Button
-                                    variant="ghost"
-                                    size="icon"
-                                    className="size-7 text-muted-foreground hover:text-foreground"
-                                    aria-label={`Rename ${project.name}`}
-                                    onClick={() => handleRenameOpen(project)}
-                                  >
-                                    <Pencil className="size-3.5" />
-                                  </Button>
-                                </TooltipTrigger>
-                                <TooltipContent>Rename</TooltipContent>
-                              </Tooltip>
-                              <Tooltip>
-                                <TooltipTrigger asChild>
-                                  <Button
-                                    variant="ghost"
-                                    size="icon"
-                                    className="size-7 text-muted-foreground hover:text-foreground"
-                                    aria-label={`Export ${project.name}`}
-                                    onClick={() => handleExport(project)}
-                                  >
-                                    <Download className="size-3.5" />
-                                  </Button>
-                                </TooltipTrigger>
-                                <TooltipContent>Export</TooltipContent>
-                              </Tooltip>
-                              <Tooltip>
-                                <TooltipTrigger asChild>
-                                  <Button
-                                    variant="ghost"
-                                    size="icon"
-                                    className="size-7 text-muted-foreground hover:text-destructive"
-                                    aria-label={`Delete ${project.name}`}
-                                    onClick={() => handleDeleteOpen(project)}
-                                  >
-                                    <Trash2 className="size-3.5" />
-                                  </Button>
-                                </TooltipTrigger>
-                                <TooltipContent>Delete</TooltipContent>
-                              </Tooltip>
-                            </div>
+                            <ProjectActionsMenu
+                              project={project}
+                              onOpen={handleOpen}
+                              onRenameOpen={handleRenameOpen}
+                              onDuplicateOpen={handleDuplicateOpen}
+                              onExport={handleExport}
+                              onDeleteOpen={handleDeleteOpen}
+                              trigger={
+                                <Button variant="ghost" size="icon" className="size-7" aria-label={`Actions for ${project.name}`}>
+                                  <MoreHorizontal className="size-4" />
+                                </Button>
+                              }
+                            />
                           </TableCell>
                         </TableRow>
                       )
@@ -786,8 +828,14 @@ export function ProjectsPage() {
                           className="absolute right-1.5 top-1.5 z-10 opacity-0 transition-opacity group-hover:opacity-100 focus-within:opacity-100"
                           onClick={(e) => e.stopPropagation()}
                         >
-                          <DropdownMenu>
-                            <DropdownMenuTrigger asChild>
+                          <ProjectActionsMenu
+                            project={project}
+                            onOpen={handleOpen}
+                            onRenameOpen={handleRenameOpen}
+                            onDuplicateOpen={handleDuplicateOpen}
+                            onExport={handleExport}
+                            onDeleteOpen={handleDeleteOpen}
+                            trigger={
                               <Button
                                 variant="secondary"
                                 size="icon"
@@ -797,29 +845,8 @@ export function ProjectsPage() {
                               >
                                 <MoreHorizontal className="size-4" />
                               </Button>
-                            </DropdownMenuTrigger>
-                            <DropdownMenuContent align="end">
-                              <DropdownMenuItem onClick={() => handleOpen(project.id)}>
-                                <FolderOpen className="size-4" />
-                                Open
-                              </DropdownMenuItem>
-                              <DropdownMenuItem onClick={() => handleRenameOpen(project)}>
-                                <Pencil className="size-4" />
-                                Rename
-                              </DropdownMenuItem>
-                              <DropdownMenuItem onClick={() => handleExport(project)}>
-                                <Download className="size-4" />
-                                Export
-                              </DropdownMenuItem>
-                              <DropdownMenuItem
-                                className="text-destructive focus:text-destructive"
-                                onClick={() => handleDeleteOpen(project)}
-                              >
-                                <Trash2 className="size-4" />
-                                Delete
-                              </DropdownMenuItem>
-                            </DropdownMenuContent>
-                          </DropdownMenu>
+                            }
+                          />
                         </div>
                       </div>
                       <div className="flex flex-1 flex-col gap-1 p-3">
@@ -920,6 +947,38 @@ export function ProjectsPage() {
           </DialogContent>
         </Dialog>
 
+        {/* Duplicate dialog */}
+        <Dialog open={!!duplicateTarget} onOpenChange={(open) => { if (!open) { setDuplicateTarget(null); setDuplicateName('') } }}>
+          <DialogContent onCloseAutoFocus={(e) => e.preventDefault()}>
+            <DialogHeader>
+              <DialogTitle>Duplicate project</DialogTitle>
+              <DialogDescription>Enter a name for the duplicate project.</DialogDescription>
+            </DialogHeader>
+            <Input
+              ref={duplicateInputRef}
+              value={duplicateName}
+              onChange={(e) => setDuplicateName(e.target.value)}
+              onKeyDown={(e) => {
+                if (e.key === 'Enter') handleDuplicateConfirm()
+                if (e.key === 'Escape') setDuplicateTarget(null)
+              }}
+              placeholder="Project name"
+              aria-label="Duplicate project name"
+            />
+            {duplicateTarget && duplicateName.trim() && orderedProjects.some((p) => p.name.toLowerCase() === duplicateName.trim().toLowerCase()) && (
+              <p className="text-xs text-amber-600 dark:text-amber-500">A project with this name already exists.</p>
+            )}
+            <DialogFooter>
+              <Button variant="outline" onClick={() => { setDuplicateTarget(null); setDuplicateName('') }}>
+                Cancel
+              </Button>
+              <Button onClick={handleDuplicateConfirm} disabled={!duplicateName.trim()}>
+                Duplicate
+              </Button>
+            </DialogFooter>
+          </DialogContent>
+        </Dialog>
+
         {/* Delete confirmation */}
         <Dialog open={!!deleteTarget} onOpenChange={(open) => !open && setDeleteTarget(null)}>
           <DialogContent>