diff --git a/packages/api/src/open-api.ts b/packages/api/src/open-api.ts
index b3530aa19..f398036b1 100644
--- a/packages/api/src/open-api.ts
+++ b/packages/api/src/open-api.ts
@@ -5,6 +5,7 @@ import { API_KEY_HEADER_NAME } from "@homarr/auth/api-key";
 import { appRouter } from "./router/app";
 import { boardRouter } from "./router/board";
 import { integrationRequestProcedure } from "./router/integration/integration-request";
+import { integrationTestStoredConnectionProcedure } from "./router/integration/integration-test-stored-connection";
 import { infoRouter } from "./router/info";
 import { inviteRouter } from "./router/invite";
 import { serverSettingsRouter } from "./router/serverSettings";
@@ -20,7 +21,10 @@ export const openApiRouter = createTRPCRouter({
   inviteRouter,
   serverSettingsRouter,
   userRouter,
-  integration: createTRPCRouter({ request: integrationRequestProcedure }),
+  integration: createTRPCRouter({
+    request: integrationRequestProcedure,
+    testConnection: integrationTestStoredConnectionProcedure,
+  }),
 });
 
 export const openApiDocument = (base: string) => {
diff --git a/packages/api/src/router/integration/integration-router.ts b/packages/api/src/router/integration/integration-router.ts
index 9f6439207..5b540a4ca 100644
--- a/packages/api/src/router/integration/integration-router.ts
+++ b/packages/api/src/router/integration/integration-router.ts
@@ -44,6 +44,7 @@ import { createTRPCRouter, permissionRequiredProcedure, protectedProcedure, publ
 import { throwIfActionForbiddenAsync } from "./integration-access";
 import { integrationRequestProcedure } from "./integration-request";
 import { MissingSecretError, testConnectionAsync } from "./integration-test-connection";
+import { integrationTestStoredConnectionProcedure } from "./integration-test-stored-connection";
 import { mapTestConnectionError } from "./map-test-connection-error";
 
 const logger = createLogger({ module: "integrationRouter" });
@@ -51,6 +52,7 @@ const mediaRequestSearchKinds = getIntegrationKindsByCategory("mediaSearch");
 
 export const integrationRouter = createTRPCRouter({
   request: integrationRequestProcedure,
+  testConnection: integrationTestStoredConnectionProcedure,
   getKinds: publicProcedure
     .meta({
       mcp: {
diff --git a/packages/api/src/router/integration/integration-test-stored-connection.ts b/packages/api/src/router/integration/integration-test-stored-connection.ts
new file mode 100644
index 000000000..0395c0350
--- /dev/null
+++ b/packages/api/src/router/integration/integration-test-stored-connection.ts
@@ -0,0 +1,57 @@
+import { TRPCError } from "@trpc/server";
+import { z } from "zod/v4";
+
+import { eq } from "@homarr/db";
+import { integrations } from "@homarr/db/schema";
+import { byIdSchema } from "@homarr/validation/common";
+
+import { protectedProcedure } from "../../trpc";
+import { throwIfActionForbiddenAsync } from "./integration-access";
+import { MissingSecretError, testConnectionAsync } from "./integration-test-connection";
+
+export const integrationTestStoredConnectionProcedure = protectedProcedure
+  .meta({
+    openapi: {
+      method: "GET",
+      path: "/api/integrations/{id}/test-connection",
+      tags: ["integrations"],
+      protect: true,
+      summary: "Test a saved integration using stored credentials",
+      description:
+        "Requires full integration access. Runs the native connection check without changing saved configuration. Upstream authentication may establish a session. Success is a connection check, not widget or service acceptance. Failures expose only a safe category, not upstream errors or credentials.",
+    },
+  })
+  .input(byIdSchema)
+  .output(
+    z.discriminatedUnion("success", [
+      z.object({ success: z.literal(true) }),
+      z.object({
+        success: z.literal(false),
+        error: z.enum(["missingSecret", "authorization", "certificate", "request", "statusCode", "parse", "unknown"]),
+      }),
+    ]),
+  )
+  .query(async ({ ctx, input }) => {
+    const where = eq(integrations.id, input.id);
+    await throwIfActionForbiddenAsync(ctx, where, "full");
+
+    const integration = await ctx.db.query.integrations.findFirst({ where, with: { secrets: true } });
+    if (!integration) {
+      throw new TRPCError({ code: "NOT_FOUND", message: "Integration not found" });
+    }
+
+    try {
+      const result = await testConnectionAsync(
+        {
+          ...integration,
+          secrets: integration.secrets.map(({ kind }) => ({ kind, value: null })),
+        },
+        integration.secrets,
+      );
+      if (result.success) return { success: true as const };
+      return { success: false as const, error: result.error.type };
+    } catch (error) {
+      if (error instanceof MissingSecretError) return { success: false as const, error: "missingSecret" as const };
+      return { success: false as const, error: "unknown" as const };
+    }
+  });
diff --git a/packages/api/src/router/test/integration/integration-test-stored-connection.spec.ts b/packages/api/src/router/test/integration/integration-test-stored-connection.spec.ts
new file mode 100644
index 000000000..22c1faded
--- /dev/null
+++ b/packages/api/src/router/test/integration/integration-test-stored-connection.spec.ts
@@ -0,0 +1,86 @@
+import { beforeEach, expect, test, vi } from "vitest";
+
+import type { Session } from "@homarr/auth";
+import { encryptSecret } from "@homarr/common/server";
+import { integrations, integrationSecrets } from "@homarr/db/schema";
+import { createDb } from "@homarr/db/test";
+
+import { integrationTestStoredConnectionProcedure } from "../../integration/integration-test-stored-connection";
+import { createTRPCRouter } from "../../../trpc";
+
+const { factory, upstreamTest } = vi.hoisted(() => ({ factory: vi.fn(), upstreamTest: vi.fn() }));
+vi.mock("@homarr/integrations/factory", () => ({ createIntegrationAsync: factory }));
+
+beforeEach(() => {
+  factory.mockReset().mockResolvedValue({ testConnectionAsync: upstreamTest });
+  upstreamTest.mockReset().mockResolvedValue({ success: true });
+});
+
+const setup = async (permissions: Session["user"]["permissions"] = ["integration-full-all"]) => {
+  const db = createDb();
+  await db.insert(integrations).values({ id: "saved", name: "Sonarr", kind: "sonarr", url: "http://sonarr:8989" });
+  await db
+    .insert(integrationSecrets)
+    .values({ integrationId: "saved", kind: "apiKey", value: encryptSecret("private-key") });
+  const session: Session = {
+    user: { id: "owner", permissions, colorScheme: "light" },
+    expires: new Date().toISOString(),
+  };
+  const router = createTRPCRouter({ testConnection: integrationTestStoredConnectionProcedure });
+  return { db, router, caller: router.createCaller({ db, session, deviceType: undefined }) };
+};
+
+test("tests stored credentials without modifying saved configuration", async () => {
+  const { db, caller } = await setup();
+  const before = await db.query.integrations.findFirst({ with: { secrets: true } });
+  expect(await caller.testConnection({ id: "saved" })).toEqual({ success: true });
+  expect(factory).toHaveBeenCalledWith(
+    expect.objectContaining({
+      id: "saved",
+      decryptedSecrets: [expect.objectContaining({ kind: "apiKey", value: "private-key" })],
+    }),
+  );
+  expect(await db.query.integrations.findFirst({ with: { secrets: true } })).toEqual(before);
+});
+
+test("denies use-only access and hides missing integrations before loading secrets", async () => {
+  const { caller } = await setup(["integration-use-all"]);
+  await expect(caller.testConnection({ id: "saved" })).rejects.toMatchObject({ code: "NOT_FOUND" });
+  await expect(caller.testConnection({ id: "missing" })).rejects.toMatchObject({ code: "NOT_FOUND" });
+  expect(factory).not.toHaveBeenCalled();
+});
+
+test("requires authentication", async () => {
+  const { db, router } = await setup();
+  const caller = router.createCaller({ db, session: null, deviceType: undefined });
+  await expect(caller.testConnection({ id: "saved" })).rejects.toMatchObject({ code: "UNAUTHORIZED" });
+  expect(factory).not.toHaveBeenCalled();
+});
+
+test("returns only safe categories for upstream failures and thrown errors", async () => {
+  const { caller } = await setup();
+  upstreamTest.mockResolvedValueOnce({
+    success: false,
+    error: {
+      type: "authorization",
+      message: "private-key",
+      data: { token: "private-key" },
+      cause: new Error("private-key"),
+    },
+  });
+  expect(await caller.testConnection({ id: "saved" })).toEqual({ success: false, error: "authorization" });
+  factory.mockRejectedValueOnce(new Error("private-key"));
+  expect(await caller.testConnection({ id: "saved" })).toEqual({ success: false, error: "unknown" });
+  const { db } = await setup();
+  await db.delete(integrationSecrets);
+  const router = createTRPCRouter({ testConnection: integrationTestStoredConnectionProcedure });
+  const noSecretsCaller = router.createCaller({
+    db,
+    session: {
+      user: { id: "owner", permissions: ["integration-full-all"], colorScheme: "light" },
+      expires: new Date().toISOString(),
+    },
+    deviceType: undefined,
+  });
+  expect(await noSecretsCaller.testConnection({ id: "saved" })).toEqual({ success: false, error: "missingSecret" });
+});