Use page.viewport() to read Puppeteer’s configured viewport and await page.setViewport({ width, height }) to change it. Set the viewport before navigating when possible; use page.emulate(device) instead when you need a device profile that includes a user agent as well as viewport metrics.
Set a Puppeteer viewport
Call setViewport() on a Page, passing a viewport object with pixel dimensions. The official example sets a 640 × 480 viewport before opening the site:
const page = await browser.newPage();
await page.setViewport({
width: 640,
height: 480,
deviceScaleFactor: 1,
});
await page.goto('https://example.com');
const configuredViewport = page.viewport();
console.log(configuredViewport);setViewport() is asynchronous, so await it before navigating or taking a screenshot. Puppeteer recommends setting it before navigation: changing certain settings after the page loads may produce unexpected behavior, and changing isMobile or hasTouch can reload the page. See the Page.setViewport() API reference.
Viewport options
The viewport object uses width and height for its dimensions. You can also set deviceScaleFactor, as in the example. The API accepts a Viewport object or null; consult the reference for the full set of properties supported by your installed Puppeteer version.
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Read the configured viewport
Call page.viewport() to retrieve Puppeteer’s current configured viewport settings:
const viewport = page.viewport();
console.log(viewport);The method returns Viewport | null. It reports the value configured through page.setViewport() or the default supplied through ConnectOptions.defaultViewport; it does not independently measure the page’s actual viewport. The distinction matters if you are trying to verify browser rendering rather than inspect Puppeteer’s configuration. See the Page.viewport() API reference.
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Reset the viewport to its default
Pass null to reset the page to its configured default viewport:
await page.setViewport(null);Unless you configured another default, Puppeteer’s documented ConnectOptions.defaultViewport default is { width: 800, height: 600 }. That default is set for each page. See ConnectOptions.defaultViewport and the setViewport() reference.
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Choose between manual dimensions and device emulation
- Use
setViewport()when you need to control dimensions and viewport settings without changing the user agent. - Use
page.emulate(device)when you need a known device profile that applies device metrics and user-agent settings together. For example, the current documentation showsKnownDevices['iPhone 17 Pro']:
import { KnownDevices } from 'puppeteer';
const device = KnownDevices['iPhone 17 Pro'];
await page.emulate(device);
await page.goto('https://example.com');Emulation should also be applied before navigation. The available device definitions can change between Puppeteer versions, so check the list in the version installed in your project. See Page.emulate().
Viewport size versus browser window size
A page viewport and the browser window’s content area are related, but managed separately. If your task is to resize the browser window’s content dimensions, use Puppeteer’s window-management API rather than treating setViewport() as a window-resizing method. The window-management guide clears the default viewport with page.setViewport(null) before calling page.resize(); follow that guide’s sequence for your browser setup: Puppeteer window management.
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Common viewport problems
page.viewport()returns a value different from what the browser appears to show: it returns configured settings, not a measurement of the rendered page. Check the actual page or browser content area separately.- The page reloads after setting the viewport: changing
isMobileorhasTouchcan trigger a reload. Set the desired values before navigation when possible. - The site renders at the wrong size: confirm that you awaited
setViewport()and called it beforegoto(). Also check whether you intended to resize the browser window rather than the page viewport. - A device profile is not found: device names depend on the definitions in the installed Puppeteer version. Check that version’s
KnownDeviceslist, or use a manual viewport object if only dimensions are needed. - The viewport resets to an unexpected size:
setViewport(null)restores the configured default. CheckConnectOptions.defaultViewport; absent an override, its documented dimensions are 800 × 600.
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