diff --git a/src/components/ui/__tests__/password-input.test.tsx b/src/components/ui/__tests__/password-input.test.tsx
new file mode 100644
index 000000000..dadb1389d
--- /dev/null
+++ b/src/components/ui/__tests__/password-input.test.tsx
@@ -0,0 +1,44 @@
+import { describe, it, expect } from "vitest";
+import { renderToStaticMarkup } from "react-dom/server";
+
+import { I18nProvider } from "@/lib/i18n/context";
+import { PasswordInput } from "../password-input";
+
+/**
+ * PasswordInput bakes the password-manager autofill guard in by default so
+ * BYOK API keys / webhook secrets / ntfy tokens (config secrets, not
+ * credentials) are never offered up to Bitwarden / 1Password / LastPass.
+ * Credential fields that pass a real autocomplete token keep manager
+ * integration.
+ */
+function render(node: React.ReactNode) {
+  return renderToStaticMarkup(
+    <I18nProvider initialLocale="en">{node}</I18nProvider>,
+  );
+}
+
+describe("PasswordInput", () => {
+  it("suppresses password managers by default for config secrets", () => {
+    const html = render(<PasswordInput id="ntfy-token" />);
+    expect(html).toMatch(/autocomplete="off"/i);
+    expect(html).toContain("data-bwignore");
+    expect(html).toContain("data-1p-ignore");
+    expect(html).toContain('data-lpignore="true"');
+  });
+
+  it("treats an explicit autoComplete=off as a config secret too", () => {
+    const html = render(<PasswordInput id="tg-token" autoComplete="off" />);
+    expect(html).toContain("data-bwignore");
+    expect(html).toContain("data-1p-ignore");
+  });
+
+  it("keeps manager integration for credential fields", () => {
+    const html = render(
+      <PasswordInput id="current-password" autoComplete="current-password" />,
+    );
+    expect(html).toMatch(/autocomplete="current-password"/i);
+    expect(html).not.toContain("data-bwignore");
+    expect(html).not.toContain("data-1p-ignore");
+    expect(html).not.toContain("data-lpignore");
+  });
+});
diff --git a/src/components/ui/password-input.tsx b/src/components/ui/password-input.tsx
index 7e1ac7625..e9149c3ce 100644
--- a/src/components/ui/password-input.tsx
+++ b/src/components/ui/password-input.tsx
@@ -22,14 +22,28 @@ import { useTranslations } from "@/lib/i18n/context";
  */
 export function PasswordInput({
   className,
+  autoComplete,
   ...props
 }: React.ComponentProps<typeof Input>) {
   const [visible, setVisible] = useState(false);
   const { t } = useTranslations();
+
+  // Config/secret fields (BYOK API keys, webhook secrets, ntfy tokens) pass no
+  // `autoComplete` — they are not credentials, so a password manager offering
+  // to fill or *save* them is noise and risks clobbering the field. Suppress
+  // Bitwarden / 1Password / LastPass by default for those. Credential fields
+  // (login, register, password change) pass a real token
+  // (`current-password` / `new-password` / `username`) and keep manager
+  // integration; only an explicit `"off"` opts back into suppression.
+  const suppressManagers = autoComplete == null || autoComplete === "off";
   return (
     <div className="relative">
       <Input
         {...props}
+        autoComplete={autoComplete ?? "off"}
+        data-bwignore={suppressManagers ? "" : undefined}
+        data-1p-ignore={suppressManagers ? "" : undefined}
+        data-lpignore={suppressManagers ? "true" : undefined}
         type={visible ? "text" : "password"}
         className={cn("pr-12", className)}
       />