diff --git a/packages/browser/src/report-dialog-styles.ts b/packages/browser/src/report-dialog-styles.ts
index b053c957..40eed3b5 100644
--- a/packages/browser/src/report-dialog-styles.ts
+++ b/packages/browser/src/report-dialog-styles.ts
@@ -278,6 +278,54 @@ textarea.${p}input { min-height: 8.2em; resize: vertical; }
 }
 .${p}confirm-discard { color: ${v('accent')}; }
 
+/* While a send is in flight the form is dimmed and the viewer's infinity loader sits over it. */
+.${p}card[data-busy] .${p}bar,
+.${p}card[data-busy] .${p}body,
+.${p}card[data-busy] .${p}footer-row { opacity: 0.45; transition: opacity 120ms; }
+.${p}busy {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: progress;
+}
+.${p}busy[hidden] { display: none; }
+.${p}infinity { width: 80px; height: 40px; overflow: visible; display: block; }
+.${p}infinity-track {
+  fill: none;
+  stroke: ${v('field-border')};
+  stroke-width: 3;
+  stroke-linecap: round;
+  opacity: 0.5;
+}
+.${p}infinity-bar {
+  fill: none;
+  stroke: ${v('accent')};
+  stroke-width: 3;
+  stroke-linecap: round;
+  stroke-dasharray: 25 75;
+  stroke-dashoffset: 0;
+  animation: ${p}infinity-travel 1.6s linear infinite;
+}
+@keyframes ${p}infinity-travel { to { stroke-dashoffset: -100; } }
+/* Reduced motion means no motion (as with the card entry below): a static track with a part-drawn bar. */
+@media (prefers-reduced-motion: reduce) {
+  .${p}infinity-bar { animation: none; }
+}
+/* Visually hidden, still announced: the live region that speaks "Sending…". */
+.${p}announcer {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  margin: -1px;
+  padding: 0;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
 /* On a phone-sized viewport the card is the mobile SDKs' full-screen form. */
 @media (max-width: 480px) {
   .${p}overlay { padding: 0; }
diff --git a/packages/browser/src/report-dialog.test.ts b/packages/browser/src/report-dialog.test.ts
index 026a6a31..fd9956ec 100644
--- a/packages/browser/src/report-dialog.test.ts
+++ b/packages/browser/src/report-dialog.test.ts
@@ -511,6 +511,63 @@ describe('sending', () => {
     expect(await pending).toEqual({ ok: false });
   });
 
+  it('dims the form and shows the infinity loader over it while sending', async () => {
+    let finish: (value: UploadResult) => void = () => {};
+    const { show, upload } = harness();
+    upload.mockImplementation(() => new Promise<UploadResult>((resolve) => (finish = resolve)));
+    const pending = show();
+    const busy = q('[data-busy-overlay]');
+    const announcer = q('[data-announcer]');
+    expect(announcer.textContent).toBe('');
+    const card = q('form');
+    expect(busy.hasAttribute('hidden')).toBe(true);
+    expect(card.hasAttribute('data-busy')).toBe(false);
+
+    send();
+
+    expect(busy.hasAttribute('hidden')).toBe(false);
+    expect(busy.getAttribute('aria-hidden')).toBe('true'); // visual only; the spoken state is the announcer
+    // the viewer's loader: a faint track and a travelling bar on the same lemniscate path
+    const paths = busy.querySelectorAll('svg path');
+    expect(paths).toHaveLength(2);
+    expect(paths[0]?.getAttribute('d')).toBe(paths[1]?.getAttribute('d'));
+    expect(paths[1]?.getAttribute('class')).toContain('infinity-bar');
+
+    // spoken from an always-rendered live region OUTSIDE the form (no busy ancestor), its text set on send
+    expect(announcer.textContent).toBe('Sending…');
+    expect(announcer.getAttribute('role')).toBe('status');
+    expect(card.contains(announcer)).toBe(false);
+    expect(card.hasAttribute('aria-busy')).toBe(false);
+    // the powered-by link is out of the tab order while the form is locked
+    expect(q('[data-powered]').closest('[inert]')).not.toBeNull();
+    // the sections are dimmed by the stylesheet (jsdom does not cascade shadow-root styles, so read the rule)
+    const css = REPORT_DIALOG_CSS.replace(/\s+/g, ' ');
+    for (const section of ['bar', 'body', 'footer-row']) {
+      expect(css).toContain(
+        `.bugsee-reporting-dialog-card[data-busy] .bugsee-reporting-dialog-${section}`,
+      );
+    }
+    expect(css).toMatch(/\[data-busy\] \.bugsee-reporting-dialog-footer-row \{ opacity: 0\.45/);
+    // reduced motion turns the travelling bar off
+    expect(css).toMatch(
+      /prefers-reduced-motion: reduce\) \{ \.bugsee-reporting-dialog-infinity-bar \{ animation: none; \}/,
+    );
+
+    finish({ ok: true });
+    await pending;
+  });
+
+  it('speaks the localized "sending" string', async () => {
+    const { show, upload } = harness();
+    upload.mockImplementation(() => new Promise<UploadResult>(() => {}));
+    void show({ strings: { sending: 'Wird gesendet…' } });
+
+    send();
+
+    expect(q('[data-announcer]').textContent).toBe('Wird gesendet…');
+    expect(q('[data-action="send"]').getAttribute('aria-label')).toBe('Wird gesendet…');
+  });
+
   it('closes and resolves a failed result rather than hanging when the upload throws', async () => {
     const { show, upload } = harness();
     upload.mockRejectedValue(new Error('boom'));
diff --git a/packages/browser/src/report-dialog.ts b/packages/browser/src/report-dialog.ts
index a3b6129a..35001810 100644
--- a/packages/browser/src/report-dialog.ts
+++ b/packages/browser/src/report-dialog.ts
@@ -103,6 +103,10 @@ export interface ReportDialogDeps {
 }
 
 const SVG_NS = 'http://www.w3.org/2000/svg';
+
+// The viewer's loading mark: one closed lemniscate (infinity sign) in a 100×50 box.
+const INFINITY_PATH =
+  'M20,25 C20,5 35,5 50,25 C65,45 80,45 80,25 C80,5 65,5 50,25 C35,45 20,45 20,25 Z';
 // Material "bug_report" and "close" glyphs (Apache-2.0).
 const BUG_PATH =
   'M20 8h-2.81a5.985 5.985 0 0 0-1.82-1.96L17 4.41 15.59 3l-2.17 2.17a6.002 6.002 0 0 0-2.83 0L8.41 3 7 4.41l1.62 1.63C7.88 6.55 7.26 7.22 6.81 8H4v2h2.09c-.05.33-.09.66-.09 1v1H4v2h2v1c0 .34.04.67.09 1H4v2h2.81c1.04 1.79 2.97 3 5.19 3s4.15-1.21 5.19-3H20v-2h-2.09c.05-.33.09-.66.09-1v-1h2v-2h-2v-1c0-.34-.04-.67-.09-1H20V8zm-6 8h-4v-2h4v2zm0-4h-4v-2h4v2z';
@@ -162,6 +166,9 @@ interface Refs {
   send: HTMLButtonElement;
   close: HTMLButtonElement;
   confirm: HTMLElement;
+  busyOverlay: HTMLElement;
+  announcer: HTMLElement;
+  footer: HTMLElement;
   keep: HTMLButtonElement;
   discard: HTMLButtonElement;
   fields: Partial<Record<FieldName, HTMLInputElement | HTMLTextAreaElement>>;
@@ -263,6 +270,12 @@ function showDialog(
       radio.disabled = value;
     }
     refs.close.disabled = value;
+    // Dim the form and cover it with the loader, so a send in flight is visible (not just a greyed button).
+    refs.form.toggleAttribute('data-busy', value);
+    refs.announcer.textContent = value ? strings.sending : '';
+    // The powered-by link is the one control left enabled: keep it out of the tab order while sending.
+    refs.footer.toggleAttribute('inert', value);
+    refs.busyOverlay.toggleAttribute('hidden', !value);
   };
 
   const showConfirm = (visible: boolean): void => {
@@ -689,8 +702,34 @@ function build(
   hook(discardBody, 'confirm-body');
   confirm.append(discardTitle, discardBody, actions);
 
-  form.append(bar, body, footerRow, confirm);
-  dialog.append(form);
+  // The "sending" cover: the viewer's infinity-sign loader (a faint track with a bar travelling along the
+  // same lemniscate; see the `infinity-bar` animation in the styles), shown over the dimmed form.
+  // Purely visual (`aria-hidden`): the spoken state is the persistent live region below, outside the form.
+  const busyOverlay = make('div', { 'aria-hidden': 'true', hidden: '' });
+  hook(busyOverlay, 'busy');
+  busyOverlay.setAttribute('data-busy-overlay', '');
+  const loader = doc.createElementNS(SVG_NS, 'svg');
+  loader.setAttribute('viewBox', '0 0 100 50');
+  loader.setAttribute('aria-hidden', 'true');
+  hook(loader, 'infinity');
+  for (const name of ['infinity-track', 'infinity-bar']) {
+    const path = doc.createElementNS(SVG_NS, 'path');
+    path.setAttribute('d', INFINITY_PATH);
+    path.setAttribute('pathLength', '100');
+    hook(path, name);
+    loader.append(path);
+  }
+  busyOverlay.append(loader);
+
+  // The announcement: an always-rendered, initially EMPTY live region OUTSIDE the form (so nothing busy is
+  // its ancestor), whose text is set when a send starts — screen readers announce a text change in an
+  // exposed region far more reliably than a region that is merely unhidden. Visually hidden.
+  const announcer = make('div', { role: 'status', 'aria-live': 'polite' });
+  hook(announcer, 'announcer');
+  announcer.setAttribute('data-announcer', '');
+
+  form.append(bar, body, footerRow, confirm, busyOverlay);
+  dialog.append(form, announcer);
   shadow.append(dialog);
 
   return {
@@ -700,6 +739,9 @@ function build(
     send,
     close,
     confirm,
+    busyOverlay,
+    announcer,
+    footer: footerRow,
     keep,
     discard,
     fields: fields as Refs['fields'],