diff --git a/frontend/admin/core/views/core/langs/create-edit/hooks/use-create-edit-lang-admin.tsx b/frontend/admin/core/views/core/langs/create-edit/hooks/use-create-edit-lang-admin.tsx
index d09ddadad..5fab6cc23 100644
--- a/frontend/admin/core/views/core/langs/create-edit/hooks/use-create-edit-lang-admin.tsx
+++ b/frontend/admin/core/views/core/langs/create-edit/hooks/use-create-edit-lang-admin.tsx
@@ -66,7 +66,7 @@ export const useCreateEditLangAdmin = ({ data }: Args) => {
     toast(t(data ? "edit.success" : "create.success"), {
       description: values.name
     });
-    setOpen(false);
+    setOpen?.(false);
   };
 
   return {
diff --git a/frontend/admin/core/views/core/langs/table/actions/download/hooks/use-download-lang-admin.ts b/frontend/admin/core/views/core/langs/table/actions/download/hooks/use-download-lang-admin.ts
index a2ab021ef..3db8a7ee5 100644
--- a/frontend/admin/core/views/core/langs/table/actions/download/hooks/use-download-lang-admin.ts
+++ b/frontend/admin/core/views/core/langs/table/actions/download/hooks/use-download-lang-admin.ts
@@ -49,7 +49,7 @@ export const useDownloadLangAdmin = ({
       return;
     }
 
-    setOpen(false);
+    setOpen?.(false);
 
     window.open(
       `${CONFIG.backend_url}/files/${mutation.data.admin__core_languages__download}`,
diff --git a/frontend/admin/core/views/core/langs/table/actions/update/hooks/use-update-lang-admin.ts b/frontend/admin/core/views/core/langs/table/actions/update/hooks/use-update-lang-admin.ts
index b25d70040..84f85156b 100644
--- a/frontend/admin/core/views/core/langs/table/actions/update/hooks/use-update-lang-admin.ts
+++ b/frontend/admin/core/views/core/langs/table/actions/update/hooks/use-update-lang-admin.ts
@@ -40,7 +40,7 @@ export const useUpdateLangAdmin = ({
       return;
     }
 
-    setOpen(false);
+    setOpen?.(false);
     toast.success(t("success"), {
       description: name
     });
diff --git a/frontend/admin/core/views/core/plugins/actions/create/hooks/use-create-plugin-admin.ts b/frontend/admin/core/views/core/plugins/actions/create/hooks/use-create-plugin-admin.ts
index e52b3db65..c2b619e53 100644
--- a/frontend/admin/core/views/core/plugins/actions/create/hooks/use-create-plugin-admin.ts
+++ b/frontend/admin/core/views/core/plugins/actions/create/hooks/use-create-plugin-admin.ts
@@ -69,7 +69,7 @@ export const useCreatePluginAdmin = () => {
       description: values.name
     });
 
-    setOpen(false);
+    setOpen?.(false);
   };
 
   return {
diff --git a/frontend/admin/core/views/core/styles/nav/create-edit/hooks/use-create-edit-nav-admin.ts b/frontend/admin/core/views/core/styles/nav/create-edit/hooks/use-create-edit-nav-admin.ts
index 087119614..52ae0ab28 100644
--- a/frontend/admin/core/views/core/styles/nav/create-edit/hooks/use-create-edit-nav-admin.ts
+++ b/frontend/admin/core/views/core/styles/nav/create-edit/hooks/use-create-edit-nav-admin.ts
@@ -71,7 +71,7 @@ export const useCreateEditNavAdmin = ({ data }: CreateEditNavAdminArgs) => {
       description: convertText(values.name)
     });
 
-    setOpen(false);
+    setOpen?.(false);
   };
 
   return {
diff --git a/frontend/admin/core/views/core/styles/nav/table/actions/delete/content.tsx b/frontend/admin/core/views/core/styles/nav/table/actions/delete/content.tsx
index 4622f2df7..b226bc52b 100644
--- a/frontend/admin/core/views/core/styles/nav/table/actions/delete/content.tsx
+++ b/frontend/admin/core/views/core/styles/nav/table/actions/delete/content.tsx
@@ -28,7 +28,7 @@ export const ContentDeleteActionTableNavAdmin = ({
   return (
     <form action={onSubmit}>
       <AlertDialogHeader>
-        <AlertDialogTitle>{tCore("are_your_sure")}</AlertDialogTitle>
+        <AlertDialogTitle>{tCore("are_you_sure")}</AlertDialogTitle>
         <AlertDialogDescription>
           {t.rich("desc", {
             name: () => (
diff --git a/frontend/admin/core/views/core/styles/themes/actions/create/hooks/use-create-plugin-admin.ts b/frontend/admin/core/views/core/styles/themes/actions/create/hooks/use-create-plugin-admin.ts
index 81c93ae7c..2f5645e71 100644
--- a/frontend/admin/core/views/core/styles/themes/actions/create/hooks/use-create-plugin-admin.ts
+++ b/frontend/admin/core/views/core/styles/themes/actions/create/hooks/use-create-plugin-admin.ts
@@ -58,7 +58,7 @@ export const useCreateThemeAdmin = () => {
       description: values.name
     });
 
-    setOpen(false);
+    setOpen?.(false);
   };
 
   return {
diff --git a/frontend/admin/core/views/core/styles/themes/actions/upload/hooks/use-upload-theme.ts b/frontend/admin/core/views/core/styles/themes/actions/upload/hooks/use-upload-theme.ts
index 1cc101246..690d9dd5b 100644
--- a/frontend/admin/core/views/core/styles/themes/actions/upload/hooks/use-upload-theme.ts
+++ b/frontend/admin/core/views/core/styles/themes/actions/upload/hooks/use-upload-theme.ts
@@ -35,7 +35,7 @@ export const useThemeUpload = () => {
       return;
     }
 
-    setOpen(false);
+    setOpen?.(false);
     toast.success(t("success"));
   };
 
diff --git a/frontend/admin/core/views/core/styles/themes/table/actions/download/hooks/use-download-theme-admin.ts b/frontend/admin/core/views/core/styles/themes/table/actions/download/hooks/use-download-theme-admin.ts
index 4e14c3a02..c2e957a18 100644
--- a/frontend/admin/core/views/core/styles/themes/table/actions/download/hooks/use-download-theme-admin.ts
+++ b/frontend/admin/core/views/core/styles/themes/table/actions/download/hooks/use-download-theme-admin.ts
@@ -48,7 +48,7 @@ export const useDownloadThemeAdmin = ({
       return;
     }
 
-    setOpen(false);
+    setOpen?.(false);
 
     window.open(
       `${CONFIG.backend_url}/files/${mutation.data.admin__core_themes__download}`,
diff --git a/frontend/admin/core/views/core/styles/themes/table/actions/edit/hooks/use-edit-theme-admin.ts b/frontend/admin/core/views/core/styles/themes/table/actions/edit/hooks/use-edit-theme-admin.ts
index 10b764d17..83b42aebc 100644
--- a/frontend/admin/core/views/core/styles/themes/table/actions/edit/hooks/use-edit-theme-admin.ts
+++ b/frontend/admin/core/views/core/styles/themes/table/actions/edit/hooks/use-edit-theme-admin.ts
@@ -62,7 +62,7 @@ export const useEditThemeAdmin = ({
     toast.success(t("success"), {
       description: values.name
     });
-    setOpen(false);
+    setOpen?.(false);
   };
 
   return {
diff --git a/frontend/admin/core/views/members/groups/create-edit-form/hooks/use-create-edit-form-groups-members-admin.ts b/frontend/admin/core/views/members/groups/create-edit-form/hooks/use-create-edit-form-groups-members-admin.ts
index 0ae8a0704..d6a4d3b66 100644
--- a/frontend/admin/core/views/members/groups/create-edit-form/hooks/use-create-edit-form-groups-members-admin.ts
+++ b/frontend/admin/core/views/members/groups/create-edit-form/hooks/use-create-edit-form-groups-members-admin.ts
@@ -76,7 +76,7 @@ export const useCreateEditFormGroupsMembersAdmin = ({
       description: convertText(values.name)
     });
 
-    setOpen(false);
+    setOpen?.(false);
   };
 
   return { form, formSchema, onSubmit };
diff --git a/frontend/admin/core/views/members/staff/views/administrators/create-edit-form/hooks/use-form.ts b/frontend/admin/core/views/members/staff/views/administrators/create-edit-form/hooks/use-form.ts
index f4f0f2694..2e7621dbb 100644
--- a/frontend/admin/core/views/members/staff/views/administrators/create-edit-form/hooks/use-form.ts
+++ b/frontend/admin/core/views/members/staff/views/administrators/create-edit-form/hooks/use-form.ts
@@ -69,7 +69,7 @@ export const useFormCreateEditFormGroupsMembersAdmin = () => {
       return;
     }
 
-    setOpen(false);
+    setOpen?.(false);
     toast.success(t("administrators.add.success"), {
       description:
         values.type === "group"
diff --git a/frontend/admin/core/views/members/staff/views/moderators/create-edit-form/hooks/use-form.ts b/frontend/admin/core/views/members/staff/views/moderators/create-edit-form/hooks/use-form.ts
index 14e8aa41e..a82ebae32 100644
--- a/frontend/admin/core/views/members/staff/views/moderators/create-edit-form/hooks/use-form.ts
+++ b/frontend/admin/core/views/members/staff/views/moderators/create-edit-form/hooks/use-form.ts
@@ -69,7 +69,7 @@ export const useFormCreateEditFormGroupsMembersAdmin = () => {
       return;
     }
 
-    setOpen(false);
+    setOpen?.(false);
     toast.success(t("moderators.add.success"), {
       description:
         values.type === "group"
diff --git a/frontend/admin/forum/views/forums/create-edit/hooks/use-create-edit-form-forum-admin.ts b/frontend/admin/forum/views/forums/create-edit/hooks/use-create-edit-form-forum-admin.ts
index 67241b2b9..81ad4bb45 100644
--- a/frontend/admin/forum/views/forums/create-edit/hooks/use-create-edit-form-forum-admin.ts
+++ b/frontend/admin/forum/views/forums/create-edit/hooks/use-create-edit-form-forum-admin.ts
@@ -91,7 +91,7 @@ export const useCreateEditFormForumAdmin = ({
       return;
     }
 
-    setOpen(false);
+    setOpen?.(false);
   };
 
   return { form, onSubmit };
diff --git a/frontend/admin/forum/views/forums/table/item/actions/delete/content.tsx b/frontend/admin/forum/views/forums/table/item/actions/delete/content.tsx
index 3f5321c3b..795913abd 100644
--- a/frontend/admin/forum/views/forums/table/item/actions/delete/content.tsx
+++ b/frontend/admin/forum/views/forums/table/item/actions/delete/content.tsx
@@ -35,7 +35,7 @@ export const ContentDeleteActionForumAdmin = ({
     <Form {...form}>
       <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-6">
         <AlertDialogHeader>
-          <AlertDialogTitle>{tCore("are_your_sure")}</AlertDialogTitle>
+          <AlertDialogTitle>{tCore("are_you_sure")}</AlertDialogTitle>
           <AlertDialogDescription>
             {t.rich("desc", {
               name: () => (
diff --git a/frontend/components/ui/dialog.tsx b/frontend/components/ui/dialog.tsx
index 265eff82d..922d88fbe 100644
--- a/frontend/components/ui/dialog.tsx
+++ b/frontend/components/ui/dialog.tsx
@@ -2,6 +2,7 @@
 
 import * as DialogPrimitive from "@radix-ui/react-dialog";
 import { X } from "lucide-react";
+import { useTranslations } from "next-intl";
 import {
   createContext,
   forwardRef,
@@ -9,19 +10,24 @@ import {
   useState,
   type ComponentPropsWithoutRef,
   type ElementRef,
-  type HTMLAttributes
+  type HTMLAttributes,
+  type MouseEvent
 } from "react";
 
 import { cn } from "@/functions/classnames";
 
 interface DialogContextArgs {
-  open: boolean;
-  setOpen: (value: boolean) => void;
+  isDirty?: boolean;
+  open?: boolean;
+  setIsDirty?: (value: boolean) => void;
+  setOpen?: (value: boolean) => void;
 }
 
 export const DialogContext = createContext<DialogContextArgs>({
   open: false,
-  setOpen: () => {}
+  setOpen: () => {},
+  isDirty: false,
+  setIsDirty: () => {}
 });
 
 export const useDialog = () => useContext(DialogContext);
@@ -33,10 +39,16 @@ const Dialog = ({
   ...props
 }: DialogPrimitive.DialogProps) => {
   const [open, setOpen] = useState(false);
+  const [isDirty, setIsDirty] = useState(false);
 
   return (
     <DialogContext.Provider
-      value={{ open: openProp ?? open, setOpen: onOpenChange ?? setOpen }}
+      value={{
+        open: openProp ?? open,
+        setOpen: onOpenChange ?? setOpen,
+        isDirty,
+        setIsDirty
+      }}
     >
       <DialogPrimitive.Root
         open={openProp ?? open}
@@ -71,25 +83,49 @@ DialogOverlay.displayName = DialogPrimitive.Overlay.displayName;
 const DialogContent = forwardRef<
   ElementRef<typeof DialogPrimitive.Content>,
   ComponentPropsWithoutRef<typeof DialogPrimitive.Content>
->(({ children, className, ...props }, ref) => (
-  <DialogPortal>
-    <DialogOverlay />
-    <DialogPrimitive.Content
-      ref={ref}
-      className={cn(
-        "fixed left-[50%] top-[50%] z-50 grid w-full max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border bg-card p-5 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%] sm:rounded-lg md:w-full overflow-y-auto max-h-[calc(100vh_-_2rem)]",
-        className
-      )}
-      {...props}
-    >
-      {children}
-      <DialogPrimitive.Close className="absolute w-9 h-9 flex items-center justify-center right-4 top-4 rounded-sm opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none data-[state=open]:bg-accent data-[state=open]:text-muted-foreground">
-        <X className="h-6 w-6" />
-        <span className="sr-only">Close</span>
-      </DialogPrimitive.Close>
-    </DialogPrimitive.Content>
-  </DialogPortal>
-));
+>(({ children, className, ...props }, ref) => {
+  const t = useTranslations("core");
+  const { isDirty, setOpen } = useDialog();
+
+  const handleBeforeUnload = (
+    e:
+      | CustomEvent<{
+          originalEvent: PointerEvent;
+        }>
+      | MouseEvent<HTMLButtonElement>
+  ) => {
+    if (!isDirty) return;
+    e.preventDefault();
+
+    if (confirm(t("are_you_sure_want_to_leave_form"))) {
+      setOpen?.(false);
+    }
+  };
+
+  return (
+    <DialogPortal>
+      <DialogOverlay />
+      <DialogPrimitive.Content
+        ref={ref}
+        onPointerDownOutside={handleBeforeUnload}
+        className={cn(
+          "fixed left-[50%] top-[50%] z-50 grid w-full max-w-lg translate-x-[-50%] translate-y-[-50%] gap-4 border bg-card p-5 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%] data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%] sm:rounded-lg md:w-full overflow-y-auto max-h-screen",
+          className
+        )}
+        {...props}
+      >
+        {children}
+        <DialogPrimitive.Close
+          onClick={handleBeforeUnload}
+          className="absolute w-9 h-9 flex items-center justify-center right-4 top-4 rounded-sm opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none data-[state=open]:bg-accent data-[state=open]:text-muted-foreground"
+        >
+          <X className="h-6 w-6" />
+          <span className="sr-only">Close</span>
+        </DialogPrimitive.Close>
+      </DialogPrimitive.Content>
+    </DialogPortal>
+  );
+});
 DialogContent.displayName = DialogPrimitive.Content.displayName;
 
 const DialogHeader = ({
diff --git a/frontend/components/ui/form.tsx b/frontend/components/ui/form.tsx
index 37d3d921b..231f42bfc 100644
--- a/frontend/components/ui/form.tsx
+++ b/frontend/components/ui/form.tsx
@@ -1,12 +1,14 @@
 import * as LabelPrimitive from "@radix-ui/react-label";
 import { Slot } from "@radix-ui/react-slot";
+import { useBeforeUnload } from "react-use";
 import {
   Controller,
   FormProvider,
   useFormContext,
   type ControllerProps,
   type FieldPath,
-  type FieldValues
+  type FieldValues,
+  type FormProviderProps
 } from "react-hook-form";
 import {
   createContext,
@@ -15,13 +17,31 @@ import {
   useId,
   type ComponentPropsWithoutRef,
   type ElementRef,
-  type HTMLAttributes
+  type HTMLAttributes,
+  useEffect
 } from "react";
+import { useTranslations } from "next-intl";
 
 import { Label } from "@/components/ui/label";
 import { cn } from "@/functions/classnames";
-
-const Form = FormProvider;
+import { useDialog } from "./dialog";
+
+function Form<
+  TFieldValues extends FieldValues,
+  TContext = unknown,
+  TTransformedValues extends FieldValues = TFieldValues
+>(props: FormProviderProps<TFieldValues, TContext, TTransformedValues>) {
+  const t = useTranslations("core");
+  const formIsDirty = props.formState.isDirty;
+  useBeforeUnload(formIsDirty, t("are_you_sure_want_to_leave_form"));
+  const { setIsDirty } = useDialog();
+
+  useEffect(() => {
+    setIsDirty?.(formIsDirty);
+  }, [formIsDirty]);
+
+  return <FormProvider {...props} />;
+}
 
 type FormFieldContextValue<
   TFieldValues extends FieldValues = FieldValues,
diff --git a/frontend/hooks/core/settings/avatar/use-copper-modal-change-avatar.ts b/frontend/hooks/core/settings/avatar/use-copper-modal-change-avatar.ts
index 13945db48..d5a4d9c8a 100644
--- a/frontend/hooks/core/settings/avatar/use-copper-modal-change-avatar.ts
+++ b/frontend/hooks/core/settings/avatar/use-copper-modal-change-avatar.ts
@@ -42,7 +42,7 @@ export const useCopperModalChangeAvatar = () => {
       toast.success(t("settings.change_avatar.options.upload.title"), {
         description: t("settings.change_avatar.options.upload.success")
       });
-      setOpen(false);
+      setOpen?.(false);
     }
 
     setPending(false);
diff --git a/frontend/hooks/core/settings/avatar/use-modal-change-avatar.ts b/frontend/hooks/core/settings/avatar/use-modal-change-avatar.ts
index bff9d6635..3f630dc08 100644
--- a/frontend/hooks/core/settings/avatar/use-modal-change-avatar.ts
+++ b/frontend/hooks/core/settings/avatar/use-modal-change-avatar.ts
@@ -37,7 +37,7 @@ export const useModalChangeAvatar = () => {
         toast.success(t("settings.change_avatar.options.delete.title"), {
           description: t("settings.change_avatar.options.delete.success")
         });
-        setOpen(false);
+        setOpen?.(false);
       }
 
       setPending(false);
diff --git a/frontend/hooks/forums/forum/topics/create/use-create-topic.ts b/frontend/hooks/forums/forum/topics/create/use-create-topic.ts
index 7eaddc557..666991bd4 100644
--- a/frontend/hooks/forums/forum/topics/create/use-create-topic.ts
+++ b/frontend/hooks/forums/forum/topics/create/use-create-topic.ts
@@ -61,7 +61,7 @@ export const useCreateTopic = ({ forumId }: Props) => {
       push(`/topic/${convertNameToLink({ id, name: title })}`);
     }
 
-    setOpen(false);
+    setOpen?.(false);
   };
 
   return { form, onSubmit };
diff --git a/frontend/langs/en/core.json b/frontend/langs/en/core.json
index c471b786d..648886722 100644
--- a/frontend/langs/en/core.json
+++ b/frontend/langs/en/core.json
@@ -20,8 +20,9 @@
     "upload_new_version": "Upload New Version",
     "more_actions": "More Actions",
     "download": "Download",
-    "are_your_sure": "Are you sure?",
+    "are_you_sure": "Are you sure?",
     "are_you_absolutely_sure": "Are you absolutely sure?",
+    "are_you_sure_want_to_leave_form": "Are you sure you want to leave the form? Your changes may not be saved.",
     "hands_up": "Hands up!",
     "cancel": "Cancel",
     "confirm": "Confirm",
diff --git a/frontend/langs/pl/core.json b/frontend/langs/pl/core.json
index f781aaf74..abf84632c 100644
--- a/frontend/langs/pl/core.json
+++ b/frontend/langs/pl/core.json
@@ -20,7 +20,8 @@
     "upload_new_version": "Prześlij nową wersję",
     "more_actions": "Więcej akcji",
     "download": "Pobierz",
-    "are_your_sure": "Czy jesteś pewien?",
+    "are_you_sure": "Czy jesteś pewien?",
+    "are_you_sure_want_to_leave_form": "Czy na pewno chcesz opuścić formularz? Twoje zmiany mogą nie zostać zapisane.",
     "are_you_absolutely_sure": "Czy jesteś absolutnie pewien?",
     "hands_up": "Uwaga!",
     "cancel": "Anuluj",