diff --git a/web_src/js/components/ActionStatusIcon.vue b/web_src/js/components/ActionStatusIcon.vue
index 12da669ac4d..bebb510467b 100644
--- a/web_src/js/components/ActionStatusIcon.vue
+++ b/web_src/js/components/ActionStatusIcon.vue
@@ -2,32 +2,33 @@
     action status accepted: success, skipped, waiting, blocked, running, failure, cancelled, cancelling, unknown.
 -->
 <script lang="ts" setup>
+import {computed} from 'vue';
 import {SvgIcon} from '../svg.ts';
+import {getActionStatusIcon, type ActionStatusIconVariant} from '../modules/action-status-icon.ts';
 
 const props = withDefaults(defineProps<{
   status: 'success' | 'skipped' | 'waiting' | 'blocked' | 'running' | 'failure' | 'cancelled' | 'cancelling' | 'unknown',
   size?: number,
   className?: string,
   localeStatus?: string,
-  iconVariant?: 'circle-fill' | '',
+  iconVariant?: ActionStatusIconVariant,
 }>(), {
   size: 16,
   className: '',
   localeStatus: undefined,
   iconVariant: '',
 });
-const circleFill = props.iconVariant === 'circle-fill';
+
+const icon = computed(() => getActionStatusIcon(props.status, props.iconVariant));
+const iconClass = computed(() => {
+  const classes = [icon.value.colorClass, props.className];
+  if (props.status === 'running') classes.push('rotate-clockwise');
+  return classes.filter(Boolean).join(' ');
+});
 </script>
 
 <template>
   <span :data-tooltip-content="localeStatus ?? status" v-if="status">
-    <SvgIcon :name="circleFill ? 'octicon-check-circle-fill' : 'octicon-check'" class="tw-text-green" :size="size" :class="className" v-if="status === 'success'"/>
-    <SvgIcon name="octicon-skip" class="tw-text-text-light" :size="size" :class="className" v-else-if="status === 'skipped'"/>
-    <SvgIcon name="octicon-stop" class="tw-text-text-light" :size="size" :class="className" v-else-if="status === 'cancelled'"/>
-    <SvgIcon name="octicon-circle" class="tw-text-text-light" :size="size" :class="className" v-else-if="status === 'waiting'"/>
-    <SvgIcon name="octicon-blocked" class="tw-text-yellow" :size="size" :class="className" v-else-if="status === 'blocked'"/>
-    <SvgIcon name="gitea-running" class="tw-text-yellow" :size="size" :class="'rotate-clockwise ' + className" v-else-if="status === 'running'"/>
-    <SvgIcon name="octicon-stop" class="tw-text-yellow" :size="size" :class="className" v-else-if="status === 'cancelling'"/>
-    <SvgIcon :name="circleFill ? 'octicon-x-circle-fill' : 'octicon-x'" class="tw-text-red" :size="size" :class="className" v-else/><!-- failure, unknown -->
+    <SvgIcon :name="icon.name" :class="iconClass" :size="size"/>
   </span>
 </template>
diff --git a/web_src/js/components/RepoActionView.vue b/web_src/js/components/RepoActionView.vue
index 03d62bd7ccf..9ce926673b9 100644
--- a/web_src/js/components/RepoActionView.vue
+++ b/web_src/js/components/RepoActionView.vue
@@ -1,7 +1,8 @@
 <script setup lang="ts">
 import {SvgIcon} from '../svg.ts';
 import ActionStatusIcon from './ActionStatusIcon.vue';
-import {computed, ref, toRefs} from 'vue';
+import {computed, onBeforeUnmount, ref, toRefs, watch} from 'vue';
+import {resetActionFavicon, syncActionRunFavicon} from '../modules/favicon-status.ts';
 import {POST, DELETE} from '../modules/fetch.ts';
 import ActionRunSummaryView from './ActionRunSummaryView.vue';
 import ActionRunJobView from './ActionRunJobView.vue';
@@ -118,6 +119,14 @@ async function deleteArtifact(name: string) {
   await DELETE(buildArtifactLink(name));
   await store.forceReloadCurrentRun();
 }
+
+watch(() => run.value.status, (status) => {
+  syncActionRunFavicon(status);
+});
+
+onBeforeUnmount(() => {
+  resetActionFavicon();
+});
 </script>
 <template>
   <!-- make the view container full width to make users easier to read logs -->
diff --git a/web_src/js/modules/action-status-icon.test.ts b/web_src/js/modules/action-status-icon.test.ts
new file mode 100644
index 00000000000..0729088acbd
--- /dev/null
+++ b/web_src/js/modules/action-status-icon.test.ts
@@ -0,0 +1,9 @@
+import {getActionStatusIcon} from './action-status-icon.ts';
+
+test('getActionStatusIcon', () => {
+  expect(getActionStatusIcon('success')).toEqual({name: 'octicon-check', colorClass: 'tw-text-green'});
+  expect(getActionStatusIcon('success', 'circle-fill')).toEqual({name: 'octicon-check-circle-fill', colorClass: 'tw-text-green'});
+  expect(getActionStatusIcon('running')).toEqual({name: 'gitea-running', colorClass: 'tw-text-yellow'});
+  expect(getActionStatusIcon('failure', 'circle-fill')).toEqual({name: 'octicon-x-circle-fill', colorClass: 'tw-text-red'});
+  expect(getActionStatusIcon('cancelled')).toEqual({name: 'octicon-stop', colorClass: 'tw-text-text-light'});
+});
diff --git a/web_src/js/modules/action-status-icon.ts b/web_src/js/modules/action-status-icon.ts
new file mode 100644
index 00000000000..8148c98192f
--- /dev/null
+++ b/web_src/js/modules/action-status-icon.ts
@@ -0,0 +1,37 @@
+import type {SvgName} from '../svg.ts';
+import type {ActionsStatus} from './gitea-actions.ts';
+
+export type ActionStatusIconVariant = 'circle-fill' | '';
+
+export type ActionStatusIconSpec = {
+  name: SvgName,
+  colorClass: string,
+};
+
+// Keep in sync with templates/repo/icons/action_status.tmpl and ActionStatusIcon.vue.
+export function getActionStatusIcon(status: ActionsStatus, iconVariant: ActionStatusIconVariant = ''): ActionStatusIconSpec {
+  const circleFill = iconVariant === 'circle-fill';
+  switch (status) {
+    case 'success':
+      return {name: circleFill ? 'octicon-check-circle-fill' : 'octicon-check', colorClass: 'tw-text-green'};
+    case 'skipped':
+      return {name: 'octicon-skip', colorClass: 'tw-text-text-light'};
+    case 'cancelled':
+      return {name: 'octicon-stop', colorClass: 'tw-text-text-light'};
+    case 'waiting':
+      return {name: 'octicon-circle', colorClass: 'tw-text-text-light'};
+    case 'blocked':
+      return {name: 'octicon-blocked', colorClass: 'tw-text-yellow'};
+    case 'running':
+      return {name: 'gitea-running', colorClass: 'tw-text-yellow'};
+    case 'cancelling':
+      return {name: 'octicon-stop', colorClass: 'tw-text-yellow'};
+    case 'failure':
+    case 'unknown':
+      return {name: circleFill ? 'octicon-x-circle-fill' : 'octicon-x', colorClass: 'tw-text-red'};
+    default: {
+      const _exhaustive: never = status;
+      return _exhaustive;
+    }
+  }
+}
diff --git a/web_src/js/modules/favicon-status.test.ts b/web_src/js/modules/favicon-status.test.ts
new file mode 100644
index 00000000000..df048559253
--- /dev/null
+++ b/web_src/js/modules/favicon-status.test.ts
@@ -0,0 +1,29 @@
+import {buildStatusFaviconSvg, resetActionFavicon, syncActionRunFavicon} from './favicon-status.ts';
+
+test('buildStatusFaviconSvg uses action status icons', () => {
+  const success = buildStatusFaviconSvg('success');
+  expect(success).toContain('viewBox="0 0 640 640"');
+  expect(success).toContain('fill:#609926');
+  expect(success).toContain('data-actions-status-name="success"');
+
+  const running = buildStatusFaviconSvg('running');
+  expect(running).toContain('data-actions-status-name="running"');
+
+  const failure = buildStatusFaviconSvg('failure');
+  expect(failure).toContain('data-actions-status-name="failure"');
+});
+
+test('syncActionRunFavicon updates favicon links', () => {
+  document.head.innerHTML = `
+    <link rel="icon" href="/assets/img/favicon.svg" type="image/svg+xml">
+    <link rel="alternate icon" href="/assets/img/favicon.png" type="image/png">
+  `;
+  const links = Array.from(document.querySelectorAll<HTMLLinkElement>('link[rel~="icon"]'));
+  syncActionRunFavicon('running');
+  for (const link of links) {
+    expect(link.href).toMatch(/^data:image\/svg\+xml,/);
+    expect(decodeURIComponent(link.href)).toContain('data-actions-status-name="running"');
+  }
+  resetActionFavicon();
+  expect(links[0].href).toContain('favicon.svg');
+});
diff --git a/web_src/js/modules/favicon-status.ts b/web_src/js/modules/favicon-status.ts
new file mode 100644
index 00000000000..6667a08e653
--- /dev/null
+++ b/web_src/js/modules/favicon-status.ts
@@ -0,0 +1,90 @@
+import {getActionStatusIcon} from './action-status-icon.ts';
+import type {ActionsStatus} from './gitea-actions.ts';
+import {svgParseOuterInner} from '../svg.ts';
+import {html, htmlRaw} from '../utils/html.ts';
+
+const {svgOuter, svgInnerHtml: giteaFaviconInner} = svgParseOuterInner('gitea-favicon');
+const faviconViewBox = svgOuter.getAttribute('viewBox')!;
+const [, , faviconViewBoxWidth, faviconViewBoxHeight] = faviconViewBox.split(/\s+/).map(Number);
+
+// the status badge is rendered in the bottom-right corner, following GitHub Actions favicon proportions
+const badgeIconSize = 16;
+const badgeSizeRatio = 340 / 640;
+const badgeMargin = 6;
+const badgeDrawSize = faviconViewBoxWidth * badgeSizeRatio;
+const badgeX = faviconViewBoxWidth - badgeDrawSize - badgeMargin;
+const badgeY = faviconViewBoxHeight - badgeDrawSize - badgeMargin;
+const badgeScale = badgeDrawSize / badgeIconSize;
+// white ring behind the badge so it stands out from the logo, like GitHub's favicon
+const badgeCenter = badgeDrawSize / 2;
+const badgeRingRadius = badgeCenter + badgeDrawSize * 0.08;
+
+let currentStatus: ActionsStatus | null = null;
+const defaultFaviconHrefs = new Map<HTMLLinkElement, string>();
+const faviconDataUrlCache = new Map<ActionsStatus, string>();
+let colorProbe: HTMLElement | null = null;
+
+function rememberDefaultFaviconHrefs() {
+  if (defaultFaviconHrefs.size > 0) return;
+  for (const link of document.querySelectorAll<HTMLLinkElement>('link[rel~="icon"]')) {
+    defaultFaviconHrefs.set(link, link.href);
+  }
+}
+
+function resolveTailwindTextColor(colorClass: string): string {
+  if (!colorProbe) {
+    colorProbe = document.createElement('span');
+    colorProbe.style.display = 'none';
+    document.body.append(colorProbe);
+  }
+  colorProbe.className = colorClass;
+  return getComputedStyle(colorProbe).color || '#000000';
+}
+
+function buildStatusIconMarkup(status: ActionsStatus): string {
+  const {name, colorClass} = getActionStatusIcon(status, 'circle-fill');
+  const color = resolveTailwindTextColor(colorClass);
+  const {svgInnerHtml} = svgParseOuterInner(name);
+  const coloredInner = svgInnerHtml.replaceAll('currentColor', color);
+  const ring = html`<circle cx="${badgeX + badgeCenter}" cy="${badgeY + badgeCenter}" r="${badgeRingRadius}" fill="#ffffff"/>`;
+  const badge = html`<g data-actions-status-name="${status}" transform="translate(${badgeX}, ${badgeY}) scale(${badgeScale})" fill="${color}" color="${color}">${htmlRaw(coloredInner)}</g>`;
+  return html`${htmlRaw(ring)}${htmlRaw(badge)}`;
+}
+
+export function buildStatusFaviconSvg(status: ActionsStatus): string {
+  return html`<svg xmlns="http://www.w3.org/2000/svg" viewBox="${faviconViewBox}">${htmlRaw(giteaFaviconInner)}${htmlRaw(buildStatusIconMarkup(status))}</svg>`;
+}
+
+function buildStatusFaviconDataUrl(status: ActionsStatus): string {
+  const cached = faviconDataUrlCache.get(status);
+  if (cached) return cached;
+  const dataUrl = `data:image/svg+xml,${encodeURIComponent(buildStatusFaviconSvg(status))}`;
+  faviconDataUrlCache.set(status, dataUrl);
+  return dataUrl;
+}
+
+function setFaviconHref(href: string) {
+  rememberDefaultFaviconHrefs();
+  for (const link of defaultFaviconHrefs.keys()) {
+    if (link.isConnected) link.href = href;
+  }
+}
+
+export function syncActionRunFavicon(status: ActionsStatus | ''): void {
+  if (status === '') {
+    resetActionFavicon();
+    return;
+  }
+  if (status === currentStatus) return;
+  setFaviconHref(buildStatusFaviconDataUrl(status));
+  currentStatus = status;
+}
+
+export function resetActionFavicon(): void {
+  if (currentStatus === null) return;
+  rememberDefaultFaviconHrefs();
+  for (const [link, href] of defaultFaviconHrefs) {
+    if (link.isConnected) link.href = href;
+  }
+  currentStatus = null;
+}
diff --git a/web_src/js/svg.ts b/web_src/js/svg.ts
index 4495ec1e5a9..fe30092d102 100644
--- a/web_src/js/svg.ts
+++ b/web_src/js/svg.ts
@@ -5,6 +5,7 @@ import giteaDoubleChevronLeft from '../../public/assets/img/svg/gitea-double-che
 import giteaDoubleChevronRight from '../../public/assets/img/svg/gitea-double-chevron-right.svg';
 import giteaEmptyCheckbox from '../../public/assets/img/svg/gitea-empty-checkbox.svg';
 import giteaExclamation from '../../public/assets/img/svg/gitea-exclamation.svg';
+import giteaFavicon from '../../public/assets/img/favicon.svg';
 import giteaRunning from '../../public/assets/img/svg/gitea-running.svg';
 import octiconArchive from '../../public/assets/img/svg/octicon-archive.svg';
 import octiconArrowLeft from '../../public/assets/img/svg/octicon-arrow-left.svg';
@@ -93,6 +94,7 @@ const svgs = {
   'gitea-double-chevron-right': giteaDoubleChevronRight,
   'gitea-empty-checkbox': giteaEmptyCheckbox,
   'gitea-exclamation': giteaExclamation,
+  'gitea-favicon': giteaFavicon,
   'gitea-running': giteaRunning,
   'octicon-archive': octiconArchive,
   'octicon-arrow-left': octiconArrowLeft,