diff --git a/web/src/i18n/en.json b/web/src/i18n/en.json
index 054bf06..8982029 100644
--- a/web/src/i18n/en.json
+++ b/web/src/i18n/en.json
@@ -5,5 +5,5 @@
   "objects": { "title": "Objects", "empty": "No objects yet", "loadError": "Could not load objects", "selectPrompt": "Select an object to view its details", "notFound": "Object not found", "prev": "Previous", "next": "Next", "of": "of" },
   "fieldsLabels": { "objectNumber": "Object number", "objectName": "Name", "count": "Number of objects", "briefDescription": "Brief description", "currentLocation": "Current location", "currentOwner": "Current owner", "recorder": "Recorder", "recordingDate": "Recording date", "visibility": "Visibility", "flexible": "Catalogue fields" },
   "visibility": { "draft": "Draft", "internal": "Internal", "public": "Public" },
-  "form": { "selectPlaceholder": "— select —" }
+  "form": { "selectPlaceholder": "— select —", "create": "Create object", "save": "Save", "cancel": "Cancel", "visibility": "Visibility", "draft": "Draft", "internal": "Internal", "required": "This field is required", "rejected": "The server rejected the changes — check required and referenced fields", "flexibleHeading": "Catalogue fields" }
 }
diff --git a/web/src/i18n/sv.json b/web/src/i18n/sv.json
index 4432fd4..05a1d5d 100644
--- a/web/src/i18n/sv.json
+++ b/web/src/i18n/sv.json
@@ -5,5 +5,5 @@
   "objects": { "title": "Föremål", "empty": "Inga föremål ännu", "loadError": "Kunde inte ladda föremål", "selectPrompt": "Välj ett föremål för att se detaljer", "notFound": "Föremålet hittades inte", "prev": "Föregående", "next": "Nästa", "of": "av" },
   "fieldsLabels": { "objectNumber": "Föremålsnummer", "objectName": "Namn", "count": "Antal föremål", "briefDescription": "Kort beskrivning", "currentLocation": "Nuvarande plats", "currentOwner": "Nuvarande ägare", "recorder": "Registrerad av", "recordingDate": "Registreringsdatum", "visibility": "Synlighet", "flexible": "Katalogfält" },
   "visibility": { "draft": "Utkast", "internal": "Intern", "public": "Publik" },
-  "form": { "selectPlaceholder": "— välj —" }
+  "form": { "selectPlaceholder": "— välj —", "create": "Skapa föremål", "save": "Spara", "cancel": "Avbryt", "visibility": "Synlighet", "draft": "Utkast", "internal": "Intern", "required": "Fältet är obligatoriskt", "rejected": "Servern avvisade ändringarna — kontrollera obligatoriska och refererade fält", "flexibleHeading": "Katalogfält" }
 }
diff --git a/web/src/objects/field-input.tsx b/web/src/objects/field-input.tsx
index 78fae4a..859f919 100644
--- a/web/src/objects/field-input.tsx
+++ b/web/src/objects/field-input.tsx
@@ -1,4 +1,4 @@
-import { Controller, type UseFormReturn } from "react-hook-form";
+import { Controller, type Path, type UseFormReturn } from "react-hook-form";
 import { useTranslation } from "react-i18next";
 
 import type { components } from "../api/schema";
@@ -10,7 +10,13 @@ import { Label } from "@/components/ui/label";
 type FieldDefinitionView = components["schemas"]["FieldDefinitionView"];
 type LabelView = components["schemas"]["LabelView"];
 
-type FieldForm = UseFormReturn<{ fields: Record<string, unknown> }>;
+type FieldForm<TValues extends { fields: Record<string, unknown> }> = UseFormReturn<TValues>;
+
+function fieldPath<TValues extends { fields: Record<string, unknown> }>(
+  key: string,
+): Path<TValues> {
+  return `fields.${key}` as Path<TValues>;
+}
 
 function labelIn(labels: LabelView[], lang: string): string {
   return (
@@ -56,17 +62,17 @@ function OptionsSelect({
   );
 }
 
-export function FieldInput({
+export function FieldInput<TValues extends { fields: Record<string, unknown> }>({
   definition,
   form,
 }: {
   definition: FieldDefinitionView;
-  form: FieldForm;
+  form: FieldForm<TValues>;
 }) {
   const { t, i18n } = useTranslation();
   const lang = i18n.language.startsWith("sv") ? "sv" : "en";
   const label = labelIn(definition.labels, lang);
-  const name = `fields.${definition.key}` as `fields.${string}`;
+  const name = fieldPath<TValues>(definition.key);
   const placeholder = t("form.selectPlaceholder");
 
   switch (definition.data_type) {
@@ -133,7 +139,7 @@ export function FieldInput({
 
           <Input
             id={`${definition.key}-en`}
-            {...form.register(`fields.${definition.key}.en` as `fields.${string}`, { required: definition.required })}
+            {...form.register(fieldPath<TValues>(`${definition.key}.en`), { required: definition.required })}
           />
 
           <Label
@@ -145,7 +151,7 @@ export function FieldInput({
 
           <Input
             id={`${definition.key}-sv`}
-            {...form.register(`fields.${definition.key}.sv` as `fields.${string}`)}
+            {...form.register(fieldPath<TValues>(`${definition.key}.sv`))}
           />
         </div>
       );
@@ -187,7 +193,7 @@ export function FieldInput({
   }
 }
 
-function TermField({
+function TermField<TValues extends { fields: Record<string, unknown> }>({
   definition,
   form,
   label,
@@ -195,7 +201,7 @@ function TermField({
   placeholder,
 }: {
   definition: FieldDefinitionView;
-  form: FieldForm;
+  form: FieldForm<TValues>;
   label: string;
   lang: string;
   placeholder: string;
@@ -208,7 +214,7 @@ function TermField({
 
       <Controller
         control={form.control}
-        name={`fields.${definition.key}` as `fields.${string}`}
+        name={fieldPath<TValues>(definition.key)}
         rules={{ required: definition.required }}
         render={({ field }) => (
           <OptionsSelect
@@ -225,7 +231,7 @@ function TermField({
   );
 }
 
-function AuthorityField({
+function AuthorityField<TValues extends { fields: Record<string, unknown> }>({
   definition,
   form,
   label,
@@ -233,7 +239,7 @@ function AuthorityField({
   placeholder,
 }: {
   definition: FieldDefinitionView;
-  form: FieldForm;
+  form: FieldForm<TValues>;
   label: string;
   lang: string;
   placeholder: string;
@@ -246,7 +252,7 @@ function AuthorityField({
 
       <Controller
         control={form.control}
-        name={`fields.${definition.key}` as `fields.${string}`}
+        name={fieldPath<TValues>(definition.key)}
         rules={{ required: definition.required }}
         render={({ field }) => (
           <OptionsSelect
diff --git a/web/src/objects/object-form.test.tsx b/web/src/objects/object-form.test.tsx
new file mode 100644
index 0000000..a53c91c
--- /dev/null
+++ b/web/src/objects/object-form.test.tsx
@@ -0,0 +1,49 @@
+import { expect, test, vi } from "vitest";
+import { screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { renderApp } from "../test/render";
+import { ObjectForm } from "./object-form";
+
+test("create mode: shows visibility (draft/internal only) and submits assembled values", async () => {
+  const onSubmit = vi.fn();
+  renderApp(<ObjectForm mode="create" onSubmit={onSubmit} onCancel={() => {}} />);
+
+  await userEvent.type(await screen.findByLabelText(/object number/i), "A-9");
+  await userEvent.type(screen.getByLabelText(/^name/i), "Amphora");
+  await userEvent.type(screen.getByLabelText(/inscription/i), "To the gods");
+
+  const visibility = screen.getByLabelText(/visibility/i) as HTMLSelectElement;
+  expect([...visibility.options].map((o) => o.value)).toEqual(expect.arrayContaining(["draft", "internal"]));
+  expect([...visibility.options].map((o) => o.value)).not.toContain("public");
+
+  await userEvent.click(screen.getByRole("button", { name: /create object/i }));
+  await waitFor(() => expect(onSubmit).toHaveBeenCalledOnce());
+  const values = onSubmit.mock.calls[0][0];
+  expect(values.core.object_number).toBe("A-9");
+  expect(values.visibility).toBe("draft");
+  expect(values.fields.inscription).toBe("To the gods");
+});
+
+test("required core + required flexible field block submit", async () => {
+  const onSubmit = vi.fn();
+  renderApp(<ObjectForm mode="create" onSubmit={onSubmit} onCancel={() => {}} />);
+  await userEvent.click(await screen.findByRole("button", { name: /create object/i }));
+  await waitFor(() => expect(screen.getAllByText(/required/i).length).toBeGreaterThan(0));
+  expect(onSubmit).not.toHaveBeenCalled();
+});
+
+test("edit mode: no visibility control, save button, prefilled values", async () => {
+  const onSubmit = vi.fn();
+  renderApp(
+    <ObjectForm mode="edit" onSubmit={onSubmit} onCancel={() => {}}
+      defaults={{
+        core: { object_number: "A-1", object_name: "Amphora", number_of_objects: 1,
+          brief_description: null, current_location: "Vault 3", current_owner: null,
+          recorder: null, recording_date: null },
+        fields: { inscription: "hi" },
+      }} />,
+  );
+  expect(await screen.findByDisplayValue("Amphora")).toBeInTheDocument();
+  expect(screen.queryByLabelText(/visibility/i)).not.toBeInTheDocument();
+  expect(screen.getByRole("button", { name: /save/i })).toBeInTheDocument();
+});
diff --git a/web/src/objects/object-form.tsx b/web/src/objects/object-form.tsx
new file mode 100644
index 0000000..b450502
--- /dev/null
+++ b/web/src/objects/object-form.tsx
@@ -0,0 +1,195 @@
+import { useForm } from "react-hook-form";
+import { useTranslation } from "react-i18next";
+
+import { useFieldDefinitions } from "../api/queries";
+import { FieldInput } from "./field-input";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+
+export type ObjectCore = {
+  object_number: string;
+  object_name: string;
+  number_of_objects: number;
+  brief_description: string | null;
+  current_location: string | null;
+  current_owner: string | null;
+  recorder: string | null;
+  recording_date: string | null;
+};
+
+export type ObjectFormValues = {
+  core: ObjectCore;
+  visibility?: "draft" | "internal";
+  fields: Record<string, unknown>;
+};
+
+type FormShape = {
+  core: ObjectCore;
+  visibility: "draft" | "internal";
+  fields: Record<string, unknown>;
+} & Record<string, unknown>;
+
+const EMPTY_CORE: ObjectCore = {
+  object_number: "",
+  object_name: "",
+  number_of_objects: 1,
+  brief_description: null,
+  current_location: null,
+  current_owner: null,
+  recorder: null,
+  recording_date: null,
+};
+
+export function ObjectForm({
+  mode,
+  defaults,
+  onSubmit,
+  onCancel,
+  formError,
+}: {
+  mode: "create" | "edit";
+  defaults?: { core: ObjectCore; fields: Record<string, unknown> };
+  onSubmit: (values: ObjectFormValues) => void;
+  onCancel: () => void;
+  formError?: string | null;
+}) {
+  const { t } = useTranslation();
+
+  const { data: definitions } = useFieldDefinitions();
+
+  const form = useForm<FormShape>({
+    defaultValues: {
+      core: defaults?.core ?? EMPTY_CORE,
+      visibility: "draft",
+      fields: defaults?.fields ?? {},
+    },
+  });
+
+  const { register, handleSubmit, formState: { errors } } = form;
+
+  const submit = handleSubmit((data) => {
+    const fields = pruneFields(data.fields);
+
+    onSubmit(
+      mode === "create"
+        ? { core: data.core, visibility: data.visibility, fields }
+        : { core: data.core, fields },
+    );
+  });
+
+  const coreField = (
+    key: keyof ObjectCore,
+    labelKey: string,
+    opts?: { type?: string; required?: boolean },
+  ) => (
+    <div className="space-y-1">
+      <Label htmlFor={key}>{t(`fieldsLabels.${labelKey}`)}</Label>
+
+      <Input
+        id={key}
+        type={opts?.type ?? "text"}
+        {...register(
+          `core.${key}` as const,
+          opts?.type === "number"
+            ? { valueAsNumber: true, required: opts?.required }
+            : { required: opts?.required },
+        )}
+      />
+
+      {errors.core?.[key] && (
+        <p role="alert" className="text-xs text-red-600">
+          {t("form.required")}
+        </p>
+      )}
+    </div>
+  );
+
+  return (
+    <form onSubmit={submit} className="space-y-4 overflow-auto p-4">
+      {formError && (
+        <p role="alert" className="text-sm text-red-600">
+          {formError}
+        </p>
+      )}
+
+      {coreField("object_number", "objectNumber", { required: true })}
+      {coreField("object_name", "objectName", { required: true })}
+      {coreField("number_of_objects", "count", { type: "number", required: true })}
+      {coreField("brief_description", "briefDescription")}
+      {coreField("current_location", "currentLocation")}
+      {coreField("current_owner", "currentOwner")}
+      {coreField("recorder", "recorder")}
+      {coreField("recording_date", "recordingDate", { type: "date" })}
+
+      {mode === "create" && (
+        <div className="space-y-1">
+          <Label htmlFor="visibility">{t("form.visibility")}</Label>
+
+          <select
+            id="visibility"
+            className="w-full rounded border px-2 py-1 text-sm"
+            {...register("visibility")}
+          >
+            <option value="draft">{t("form.draft")}</option>
+            <option value="internal">{t("form.internal")}</option>
+          </select>
+        </div>
+      )}
+
+      {definitions && definitions.length > 0 && (
+        <fieldset className="space-y-3 border-t pt-3">
+          <legend className="text-xs font-medium uppercase text-neutral-500">
+            {t("form.flexibleHeading")}
+          </legend>
+
+          {definitions.map((def) => (
+            <div key={def.key}>
+              <FieldInput definition={def} form={form} />
+
+              {errors.fields?.[def.key] && (
+                <p role="alert" className="text-xs text-red-600">
+                  {t("form.required")}
+                </p>
+              )}
+            </div>
+          ))}
+        </fieldset>
+      )}
+
+      <div className="flex gap-2 pt-2">
+        <Button type="submit">
+          {mode === "create" ? t("form.create") : t("form.save")}
+        </Button>
+
+        <Button type="button" variant="ghost" onClick={onCancel}>
+          {t("form.cancel")}
+        </Button>
+      </div>
+    </form>
+  );
+}
+
+function pruneFields(fields: Record<string, unknown>): Record<string, unknown> {
+  const out: Record<string, unknown> = {};
+
+  for (const [key, value] of Object.entries(fields)) {
+    if (value === undefined || value === null || value === "") continue;
+
+    if (typeof value === "object" && !Array.isArray(value)) {
+      const inner = Object.fromEntries(
+        Object.entries(value as Record<string, unknown>).filter(
+          ([, v]) => v !== undefined && v !== null && v !== "",
+        ),
+      );
+
+      if (Object.keys(inner).length > 0) out[key] = inner;
+
+      continue;
+    }
+
+    out[key] = value;
+  }
+
+  return out;
+}