diff --git a/components/sprint/sprint-header.tsx b/components/sprint/sprint-header.tsx
index 3668466..dac19e4 100644
--- a/components/sprint/sprint-header.tsx
+++ b/components/sprint/sprint-header.tsx
@@ -8,6 +8,16 @@ import {
   DialogContent,
   DialogTitle,
 } from '@/components/ui/dialog'
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+} from '@/components/ui/alert-dialog'
 import { toast } from 'sonner'
 import { DemoTooltip } from '@/components/shared/demo-tooltip'
 import {
@@ -20,7 +30,7 @@ import {
   entityDialogFooterClasses,
   entityDialogHeaderClasses,
 } from '@/components/shared/entity-dialog-layout'
-import { updateSprintGoalAction, updateSprintDatesAction, completeSprintAction } from '@/actions/sprints'
+import { updateSprintGoalAction, updateSprintDatesAction, completeSprintAction, setAllSprintTasksDoneAction } from '@/actions/sprints'
 import type { SprintStory } from './sprint-backlog'
 
 interface Sprint {
@@ -51,12 +61,14 @@ function toDateInputValue(d: Date | null) {
   return d.toISOString().slice(0, 10)
 }
 
-export function SprintHeader({ productId: _productId, productName, sprint, isDemo, sprintStories }: SprintHeaderProps) {
+export function SprintHeader({ productId, productName, sprint, isDemo, sprintStories }: SprintHeaderProps) {
   const [editingGoal, setEditingGoal] = useState(false)
   const [editingDates, setEditingDates] = useState(false)
   const [completeOpen, setCompleteOpen] = useState(false)
   const [decisions, setDecisions] = useState<Record<string, 'DONE' | 'OPEN'>>({})
   const [isCompleting, startCompleting] = useTransition()
+  const [showAllDoneConfirm, setShowAllDoneConfirm] = useState(false)
+  const [isSettingAllDone, startSettingAllDone] = useTransition()
   const [datesDirty, setDatesDirty] = useState(false)
   const datesFormRef = useRef<HTMLFormElement>(null)
 
@@ -102,6 +114,20 @@ export function SprintHeader({ productId: _productId, productName, sprint, isDem
     })
   }
 
+  function handleAllDone() {
+    startSettingAllDone(async () => {
+      const result = await setAllSprintTasksDoneAction(sprint.id)
+      if (!result.ok) {
+        toast.error(result.error ?? 'Alles op done mislukt')
+      } else {
+        const allDone: Record<string, 'DONE' | 'OPEN'> = {}
+        sprintStories.forEach(s => { allDone[s.id] = 'DONE' })
+        setDecisions(allDone)
+      }
+      setShowAllDoneConfirm(false)
+    })
+  }
+
   return (
     <div className="px-4 py-3 border-b border-border bg-surface-container-low shrink-0">
       <div className="flex items-center justify-between gap-4">
@@ -208,6 +234,18 @@ export function SprintHeader({ productId: _productId, productName, sprint, isDem
             <p className="text-sm text-muted-foreground">
               Geef per story aan wat er mee moet gebeuren:
             </p>
+            <div className="flex justify-end">
+              <Button
+                type="button"
+                size="sm"
+                variant="outline"
+                className="border-status-done/40 text-status-done hover:bg-status-done/10"
+                disabled={isSettingAllDone || isCompleting}
+                onClick={() => setShowAllDoneConfirm(true)}
+              >
+                {isSettingAllDone ? 'Bezig…' : 'Alles op done'}
+              </Button>
+            </div>
             <div className="space-y-2">
               {sprintStories.map(story => (
                 <div key={story.id} className="flex items-center justify-between gap-3 p-2 bg-surface-container-low rounded-lg">
@@ -245,6 +283,26 @@ export function SprintHeader({ productId: _productId, productName, sprint, isDem
           </div>
         </DialogContent>
       </Dialog>
+
+      <AlertDialog open={showAllDoneConfirm} onOpenChange={setShowAllDoneConfirm}>
+        <AlertDialogContent>
+          <AlertDialogHeader>
+            <AlertDialogTitle>Alles op done zetten?</AlertDialogTitle>
+            <AlertDialogDescription>
+              Alle taken én stories in de sprint — inclusief taken met status
+              REVIEW — worden op DONE gezet. De per-story toggles hieronder
+              worden daarna bijgewerkt. Je kunt daarna nog per story aanpassen
+              vóór je de sprint afrondt.
+            </AlertDialogDescription>
+          </AlertDialogHeader>
+          <AlertDialogFooter>
+            <AlertDialogCancel disabled={isSettingAllDone}>Annuleren</AlertDialogCancel>
+            <AlertDialogAction onClick={handleAllDone} disabled={isSettingAllDone}>
+              {isSettingAllDone ? 'Bezig…' : 'Alles op done'}
+            </AlertDialogAction>
+          </AlertDialogFooter>
+        </AlertDialogContent>
+      </AlertDialog>
     </div>
   )
 }