Claude 在 Cowork 桌面端内置浏览器

Claude now has a browser built into Claude Cowork on the desktop app. When a task needs to use a website, a browser opens in the side panel and Claude navigates webpages, reads them, clicks, and types. You can now hand off the web part of the task and stay where you are: Claude can fill in a form, pull numbers from a dashboard, or work through a portal that has no connector. No extension, no setup, and nothing shared from your own browser unless you choose to.

Until now, giving Claude the ability to use the web in Cowork meant giving it access to your browser through the Claude in Chrome extension. When the work is on a page you already have open, that's still the right choice. But a lot of web tasks don't need your browser, just a browser, and now Claude has one.

It's rolling out this week to Pro, Max, and Team plans in the Claude desktop app. Enterprise admins can turn it on for their organization starting today.

Which browser, when

It's Claude's browser, not yours. The built-in browser is separate from your own. Claude never sees your tabs, bookmarks, or passwords. To stay signed in to your sites, you can bring your logins over site by site, from Chrome, Edge, or Firefox on macOS and from Firefox on Windows and Linux. Banking, email, and single sign-on sites are left out unless you choose to include them.

That's also the difference between the two ways Claude can use the web. The built-in browser is for handing web tasks to Claude while you keep working: gathering research for a report, or collecting this month’s invoices from a vendor portal. Claude in Chrome is for the page you already have open, with the accounts you're already signed in to, such as updating your CRM, working through your inbox, or editing the doc in front of you.

If you already use Claude in Chrome, it keeps working and stays your default; otherwise Claude uses the built-in browser. Switch anytime in Settings → Cowork → Preferred browser.

Staying in control

The built-in browser carries the same prompt injection risks as any AI agent that acts in a browser, where instructions hidden in a page try to redirect Claude. It runs the same safeguards as Claude in Chrome, including the checks that review Claude's actions against what you asked for. We describe them on the Claude in Chrome blog post . Those measures meaningfully reduce the risk but can't eliminate it, so we recommend starting on sites you trust. Read our safety guide for more.

Getting started

The built-in browser is rolling out over the coming week to Pro, Max, and Team plans in the Claude desktop app on macOS, Windows, and Linux (in beta). Once it reaches you, it's on by default: give Claude a task that involves a website and the browser opens on its own. On Enterprise plans, it's available now and admins can manage it in Organization settings → Cowork → Built-in browser.

The built-in browser lives in the desktop app. From the web or your phone, Claude can still drive it as long as your desktop app is open and online. On the web without the desktop app, Claude in Chrome remains the way to give Claude a browser.

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Homepage Homepage Next Next Thank you! Your submission has been received! Oops! Something went wrong while submitting the form. (function () { // ---------- Claude helper ---------- function buildClaudeUrl(text) { const url = new URL('https://claude.ai/new'); url.searchParams.set('q', text || ''); return url.toString(); }

// ---------- Auto-grow helpers ---------- function sizeTextarea(el) { // Ensure UA defaults don't force a starting height el.setAttribute('rows', el.getAttribute('data-min-rows') || '1'); el.style.minHeight = '0px'; el.style.height = 'auto'; // allow shrink el.style.height = el.scrollHeight + 'px'; // fit content }

function initAutogrow(root = document) { root.querySelectorAll('textarea[data-autogrow]').forEach((el) => { if (el.dataset.autogrowInit) return; el.dataset.autogrowInit = 'true';

// Respect your existing pattern for default text const preset = el.getAttribute('data-default-text'); if (preset != null && !el.value) el.value = preset;

// Initial sizing sizeTextarea(el);

// Resize as you type el.addEventListener('input', () => sizeTextarea(el));

// In case fonts/styles load late and change line-height window.addEventListener('load', () => sizeTextarea(el), { once: true }); }); }

// ---------- Claude form initializer ---------- function initClaudeForms(root = document) { root.querySelectorAll('form[data-claude-form]').forEach((form) => { if (form.dataset.claudeInit) return; form.dataset.claudeInit = 'true';

const textarea = form.querySelector('[data-claude-textarea], textarea'); const trigger = form.querySelector('[data-claude-button], button[type="button"], a[data-claude-button]');

if (!textarea || !trigger) { console.warn('Claude form: missing textarea or trigger in', form); return; }

// If the trigger is a but has no type, force "button" so it won't submit if (trigger.tagName === 'BUTTON' && !trigger.hasAttribute('type')) { trigger.type = 'button'; }

// Keep from navigating away while still opening Claude if (trigger.tagName === 'A') { trigger.addEventListener('click', (e) => e.preventDefault()); }

// Optional: support data-default-text on the textarea const preset = textarea.getAttribute('data-default-text'); if (preset != null && !textarea.value) textarea.value = preset;

// Click opens Claude; submission is optional trigger.addEventListener('click', () => { const text = (textarea.value || '').trim(); if (!text) { textarea.focus(); return; }

window.open(buildClaudeUrl(text), '_blank', 'noopener');

const mode = form.getAttribute('data-claude-mode') || 'intercept'; if (mode === 'also') { // Submit after opening Claude form.submit(); } // intercept mode: do nothing (no submit) });

// (Optional) Keep an href in sync for right-click/open-in-new-tab UX if (trigger.tagName === 'A') { const syncHref = () => trigger.setAttribute('href', buildClaudeUrl((textarea.value || '').trim())); syncHref(); textarea.addEventListener('input', syncHref); textarea.addEventListener('change', syncHref); } }); }

// ---------- Boot ---------- function initAll(root = document) { initAutogrow(root); initClaudeForms(root); }

if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', () => initAll(), { once: true }); } else { initAll(); }

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Privacy choices /* Dialog styling */ dialog#consent-container { margin: 0; padding: 8px; opacity: 0; transform: translateY(16px); transition: opacity 0.3s ease-out, transform 0.3s ease-out; }

dialog#consent-container.show { opacity: 1; transform: translateY(0); }

dialog#consent-container::backdrop { background: transparent; }

dialog button span { display: inline !important; }

/* Toggle switch styling */ .toggle_switch { position: relative; display: inline-block; width: 36px; height: 24px; }

.toggle_switch input { opacity: 0; width: 0; height: 0; }

.toggle_slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #87867f; transition: .4s; border-radius: 24px; }

.toggle_slider:before { position: absolute; content: ""; height: 18px; width: 18px; left: 3px; bottom: 3px; background-color: white; transition: .4s; border-radius: 50%; }

input:checked + .toggle_slider { background-color: #d97757; }

input:checked + .toggle_slider:before { transform: translateX(12px); }

input:disabled + .toggle_slider { cursor: not-allowed; opacity: 0.5; }

@media only screen and (max-width: 501px) { dialog#consent-container { left: 8px !important; bottom: 8px !important; right: 8px !important; } #consent-banner { padding: 24px 16px 16px !important; } #simple-options { grid-template-columns: repeat(3, 1fr) !important; grid-template-rows: auto auto !important; } #customize-btn { grid-column: span 1 !important; } dialog button span { display: none !important; }

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