diff --git a/apps/web/src/app/dashboard/[guildId]/forms/page.tsx b/apps/web/src/app/dashboard/[guildId]/forms/page.tsx
index 3a9920d..c29c7bc 100644
--- a/apps/web/src/app/dashboard/[guildId]/forms/page.tsx
+++ b/apps/web/src/app/dashboard/[guildId]/forms/page.tsx
@@ -120,7 +120,13 @@ export default async function GuildFormsPage({
                       <DeleteFormButton
                         guildId={guildId}
                         formId={form.id}
-                        t={{ delete: t.deleteForm, confirm: t.deleteFormConfirm, failed: t.deleteFormFailed }}
+                        t={{
+                          delete: t.deleteForm,
+                          title: t.deleteFormTitle,
+                          confirm: t.deleteFormConfirm,
+                          cancel: t.cancel,
+                          failed: t.deleteFormFailed,
+                        }}
                       />
                     )}
                   </div>
diff --git a/apps/web/src/app/s/[id]/page.tsx b/apps/web/src/app/s/[id]/page.tsx
index 2876fee..4014871 100644
--- a/apps/web/src/app/s/[id]/page.tsx
+++ b/apps/web/src/app/s/[id]/page.tsx
@@ -96,6 +96,7 @@ export default async function SubmissionStatusPage({
             deleteConfirm: t.deleteConfirm,
             deleted: t.deleted,
             actionFailed: t.actionFailed,
+            cancel: t.cancel,
           }}
         />
       </section>
diff --git a/apps/web/src/components/confirm-dialog.tsx b/apps/web/src/components/confirm-dialog.tsx
new file mode 100644
index 0000000..511f76f
--- /dev/null
+++ b/apps/web/src/components/confirm-dialog.tsx
@@ -0,0 +1,81 @@
+"use client";
+
+import { Button } from "@msk-forms/ui";
+import { useEffect } from "react";
+
+/**
+ * In-app confirmation modal — replaces the native window.confirm so destructive
+ * actions get a styled, on-brand dialog. Controlled via `open`. Overlay click
+ * and Escape cancel (unless busy); the confirm button can show a busy state and
+ * inline error.
+ */
+export function ConfirmDialog({
+  open,
+  title,
+  message,
+  confirmLabel,
+  cancelLabel,
+  busy = false,
+  error,
+  danger = true,
+  onConfirm,
+  onCancel,
+}: {
+  open: boolean;
+  title: string;
+  message: string;
+  confirmLabel: string;
+  cancelLabel: string;
+  busy?: boolean;
+  error?: string | null;
+  danger?: boolean;
+  onConfirm: () => void;
+  onCancel: () => void;
+}) {
+  useEffect(() => {
+    if (!open) return;
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === "Escape" && !busy) onCancel();
+    };
+    document.addEventListener("keydown", onKey);
+    return () => document.removeEventListener("keydown", onKey);
+  }, [open, busy, onCancel]);
+
+  if (!open) return null;
+
+  return (
+    <div
+      role="dialog"
+      aria-modal="true"
+      aria-label={title}
+      className="fixed inset-0 z-50 flex items-center justify-center p-4"
+    >
+      <div
+        className="absolute inset-0 bg-black/60 backdrop-blur-sm"
+        onClick={busy ? undefined : onCancel}
+      />
+      <div className="relative z-10 w-full max-w-md rounded-lg border border-border bg-card p-6 shadow-xl">
+        <h2 className="font-heading text-lg font-semibold text-foreground">{title}</h2>
+        <p className="mt-2 text-sm text-muted-foreground">{message}</p>
+        {error && <p className="mt-3 text-sm text-destructive">{error}</p>}
+        <div className="mt-6 flex justify-end gap-2">
+          <Button variant="ghost" onClick={onCancel} disabled={busy}>
+            {cancelLabel}
+          </Button>
+          <button
+            type="button"
+            onClick={onConfirm}
+            disabled={busy}
+            className={
+              danger
+                ? "inline-flex items-center justify-center rounded-md bg-destructive px-4 py-2 text-sm font-medium text-destructive-foreground transition-colors hover:bg-destructive/90 disabled:opacity-50"
+                : "inline-flex items-center justify-center rounded-md bg-primary px-4 py-2 text-sm font-medium text-primary-foreground transition-colors hover:bg-primary/90 disabled:opacity-50"
+            }
+          >
+            {confirmLabel}
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}
diff --git a/apps/web/src/components/dashboard/delete-form-button.tsx b/apps/web/src/components/dashboard/delete-form-button.tsx
index 8465971..7f99ad8 100644
--- a/apps/web/src/components/dashboard/delete-form-button.tsx
+++ b/apps/web/src/components/dashboard/delete-form-button.tsx
@@ -3,6 +3,8 @@
 import { useRouter } from "next/navigation";
 import { useState } from "react";
 
+import { ConfirmDialog } from "@/components/confirm-dialog";
+
 export function DeleteFormButton({
   guildId,
   formId,
@@ -10,32 +12,49 @@ export function DeleteFormButton({
 }: {
   guildId: string;
   formId: string;
-  t: { delete: string; confirm: string; failed: string };
+  t: { delete: string; title: string; confirm: string; cancel: string; failed: string };
 }) {
   const router = useRouter();
+  const [open, setOpen] = useState(false);
   const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
 
-  async function onDelete() {
-    if (!window.confirm(t.confirm)) return;
+  async function onConfirm() {
     setBusy(true);
+    setError(null);
     try {
       const res = await fetch(`/api/guilds/${guildId}/forms/${formId}`, { method: "DELETE" });
       if (!res.ok) throw new Error();
       router.refresh();
     } catch {
-      window.alert(t.failed);
+      setError(t.failed);
       setBusy(false);
     }
   }
 
   return (
-    <button
-      type="button"
-      onClick={onDelete}
-      disabled={busy}
-      className="rounded-md border border-destructive/40 px-3 py-1.5 text-sm font-medium text-destructive transition-colors hover:bg-destructive/10 disabled:opacity-50"
-    >
-      {t.delete}
-    </button>
+    <>
+      <button
+        type="button"
+        onClick={() => {
+          setError(null);
+          setOpen(true);
+        }}
+        className="rounded-md border border-destructive/40 px-3 py-1.5 text-sm font-medium text-destructive transition-colors hover:bg-destructive/10"
+      >
+        {t.delete}
+      </button>
+      <ConfirmDialog
+        open={open}
+        title={t.title}
+        message={t.confirm}
+        confirmLabel={t.delete}
+        cancelLabel={t.cancel}
+        busy={busy}
+        error={error}
+        onConfirm={onConfirm}
+        onCancel={() => setOpen(false)}
+      />
+    </>
   );
 }
diff --git a/apps/web/src/components/submission/submission-actions.tsx b/apps/web/src/components/submission/submission-actions.tsx
index 38a8bc3..b6d78e7 100644
--- a/apps/web/src/components/submission/submission-actions.tsx
+++ b/apps/web/src/components/submission/submission-actions.tsx
@@ -4,6 +4,8 @@ import { Button } from "@msk-forms/ui";
 import { useRouter } from "next/navigation";
 import { useState } from "react";
 
+import { ConfirmDialog } from "@/components/confirm-dialog";
+
 export interface SubmissionActionLabels {
   yourData: string;
   withdraw: string;
@@ -13,6 +15,7 @@ export interface SubmissionActionLabels {
   deleteConfirm: string;
   deleted: string;
   actionFailed: string;
+  cancel: string;
 }
 
 /**
@@ -32,9 +35,10 @@ export function SubmissionActions({
   const [busy, setBusy] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [deleted, setDeleted] = useState(false);
+  // Which destructive action is awaiting confirmation, if any.
+  const [confirming, setConfirming] = useState<null | "withdraw" | "delete">(null);
 
   async function withdraw() {
-    if (!window.confirm(t.withdrawConfirm)) return;
     setError(null);
     setBusy(true);
     try {
@@ -43,6 +47,7 @@ export function SubmissionActions({
         const data = (await res.json().catch(() => null)) as { error?: string } | null;
         throw new Error(data?.error ?? t.actionFailed);
       }
+      setConfirming(null);
       router.refresh();
     } catch (err) {
       setError(err instanceof Error ? err.message : t.actionFailed);
@@ -52,7 +57,6 @@ export function SubmissionActions({
   }
 
   async function remove() {
-    if (!window.confirm(t.deleteConfirm)) return;
     setError(null);
     setBusy(true);
     try {
@@ -77,7 +81,14 @@ export function SubmissionActions({
       </h2>
       <div className="flex flex-wrap gap-3">
         {canWithdraw && (
-          <Button variant="ghost" onClick={withdraw} disabled={busy}>
+          <Button
+            variant="ghost"
+            onClick={() => {
+              setError(null);
+              setConfirming("withdraw");
+            }}
+            disabled={busy}
+          >
             {t.withdraw}
           </Button>
         )}
@@ -89,14 +100,40 @@ export function SubmissionActions({
         </a>
         <Button
           variant="ghost"
-          onClick={remove}
+          onClick={() => {
+            setError(null);
+            setConfirming("delete");
+          }}
           disabled={busy}
           className="text-destructive hover:text-destructive"
         >
           {t.deleteData}
         </Button>
       </div>
-      {error && <p className="text-sm text-destructive">{error}</p>}
+      {error && !confirming && <p className="text-sm text-destructive">{error}</p>}
+
+      <ConfirmDialog
+        open={confirming === "withdraw"}
+        title={t.withdraw}
+        message={t.withdrawConfirm}
+        confirmLabel={t.withdraw}
+        cancelLabel={t.cancel}
+        busy={busy}
+        error={confirming === "withdraw" ? error : null}
+        onConfirm={withdraw}
+        onCancel={() => setConfirming(null)}
+      />
+      <ConfirmDialog
+        open={confirming === "delete"}
+        title={t.deleteData}
+        message={t.deleteConfirm}
+        confirmLabel={t.deleteData}
+        cancelLabel={t.cancel}
+        busy={busy}
+        error={confirming === "delete" ? error : null}
+        onConfirm={remove}
+        onCancel={() => setConfirming(null)}
+      />
     </div>
   );
 }
diff --git a/apps/web/src/i18n/dictionaries.ts b/apps/web/src/i18n/dictionaries.ts
index 5aecd07..fb9c04c 100644
--- a/apps/web/src/i18n/dictionaries.ts
+++ b/apps/web/src/i18n/dictionaries.ts
@@ -63,6 +63,7 @@ const en = {
     deleteConfirm: "Permanently delete this submission and its uploaded files? This cannot be undone.",
     deleted: "Your submission has been deleted.",
     actionFailed: "Action failed. Please try again.",
+    cancel: "Cancel",
   },
   preview: {
     submission: "Your submission", title: "Whitelist application", inReview: "In review",
@@ -97,7 +98,7 @@ const en = {
       "Connecting a guild happens through the Discord bot invite. That flow lands in a later slice. For now, an admin can add you to a guild.",
     countForm: "form", countForms: "forms", countSubmissions: "submissions",
     newForm: "New form", noForms: "No forms yet. Create your first one.", edit: "Edit", exportCsv: "Export CSV",
-    deleteForm: "Delete", deleteFormConfirm: "Delete this form? All its submissions, files and activity will be permanently removed. This cannot be undone.", deleteFormFailed: "Could not delete the form.",
+    deleteForm: "Delete", deleteFormTitle: "Delete form?", deleteFormConfirm: "Delete this form? All its submissions, files and activity will be permanently removed. This cannot be undone.", deleteFormFailed: "Could not delete the form.", cancel: "Cancel",
     colApplicant: "Applicant", colForm: "Form", colDate: "Date", colStatus: "Status",
     anonymous: "Anonymous", noSubmissions: "No submissions yet.", open: "Open",
     mySubmissionsTitle: "My submissions", noMySubmissions: "You haven’t submitted any forms yet.",
@@ -253,6 +254,7 @@ const de: Dictionary = {
     deleteConfirm: "Diese Einreichung und alle hochgeladenen Dateien endgültig löschen? Das kann nicht rückgängig gemacht werden.",
     deleted: "Deine Einreichung wurde gelöscht.",
     actionFailed: "Aktion fehlgeschlagen. Bitte versuche es erneut.",
+    cancel: "Abbrechen",
   },
   preview: {
     submission: "Deine Einreichung", title: "Whitelist-Bewerbung", inReview: "In Prüfung",
@@ -287,7 +289,7 @@ const de: Dictionary = {
       "Eine Guild wird über die Discord-Bot-Einladung verbunden. Dieser Ablauf kommt in einem späteren Slice. Bis dahin kann dich ein Admin zu einer Guild hinzufügen.",
     countForm: "Formular", countForms: "Formulare", countSubmissions: "Einreichungen",
     newForm: "Neues Formular", noForms: "Noch keine Formulare. Erstelle dein erstes.", edit: "Bearbeiten", exportCsv: "CSV-Export",
-    deleteForm: "Löschen", deleteFormConfirm: "Dieses Formular löschen? Alle Einreichungen, Dateien und Aktivitäten werden unwiderruflich entfernt. Das kann nicht rückgängig gemacht werden.", deleteFormFailed: "Formular konnte nicht gelöscht werden.",
+    deleteForm: "Löschen", deleteFormTitle: "Formular löschen?", deleteFormConfirm: "Dieses Formular löschen? Alle Einreichungen, Dateien und Aktivitäten werden unwiderruflich entfernt. Das kann nicht rückgängig gemacht werden.", deleteFormFailed: "Formular konnte nicht gelöscht werden.", cancel: "Abbrechen",
     colApplicant: "Bewerber", colForm: "Formular", colDate: "Datum", colStatus: "Status",
     anonymous: "Anonym", noSubmissions: "Noch keine Einreichungen.", open: "Öffnen",
     mySubmissionsTitle: "Meine Einreichungen", noMySubmissions: "Du hast noch keine Formulare abgeschickt.",