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Set Browser Window Bounds with Puppeteer

Change a Puppeteer browser window’s bounds with setWindowBounds, or choose the separate API for content-area sizing or viewport emulation.
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Use Puppeteer’s browser.setWindowBounds(windowId, bounds) to change a Chrome window’s position, outer dimensions, or state. Get the window ID with await page.windowId(). If you mean the webpage’s viewport rather than the browser window, use page.setViewport() instead.

Choose the API for the rectangle you need

API What it changes Important behavior
browser.setWindowBounds(windowId, bounds) Browser window position, outer size, or state Requires a window ID; read reported bounds with browser.getWindowBounds(windowId).
page.resize({contentWidth, contentHeight}) Page content area, excluding browser UI Experimental. A resize event may arrive asynchronously.
page.setViewport({width, height, ...}) Page viewport and device metrics Does not set an outer-window rectangle. Some changes to isMobile or hasTouch can trigger a reload.
page.emulate(device) Device emulation combining user-agent and viewport setup Apply before navigation when possible, so the site sees the emulated size during initial setup.

Puppeteer documents the browser window methods in its window-management guide and setWindowBounds API reference. Match method availability and examples to the Puppeteer version in your project.

Set position and outer window dimensions

The documented workflow uses puppeteer-core, launches Chrome with screen information, creates a window-type page, and gets that page’s window ID. This example sets the window bounds and reads back what Chrome reports:

const puppeteer = require('puppeteer-core');

(async () => {
  const browser = await puppeteer.launch({
    executablePath: '/path/to/chrome',
    headless: false,
    args: ['--screen-info={800x600}'],
  });

  const page = await browser.newPage({ type: 'window' });
  const windowId = await page.windowId();

  await browser.setWindowBounds(windowId, {
    left: 20,
    top: 20,
    width: 780,
    height: 580,
  });

  const bounds = await browser.getWindowBounds(windowId);
  console.log(bounds);

  await browser.close();
})();

Replace /path/to/chrome with the Chrome executable path for your environment. The bounds object can include left, top, width, and height. setWindowBounds returns a promise that resolves when the command completes; use getWindowBounds when you need the reported result.

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Maximize, restore, and inspect state

To change state, pass windowState:

await browser.setWindowBounds(windowId, { windowState: 'maximized' });
console.log(await browser.getWindowBounds(windowId));

await browser.setWindowBounds(windowId, { windowState: 'normal' });
console.log(await browser.getWindowBounds(windowId));

The guide demonstrates maximized and normal. A window’s dimensions depend on its screen and browser environment; do not assume a universal amount of space is reserved for browser controls.

Set the page content area instead

If the target dimensions mean the web content area, use page.resize(). It is documented as experimental. The guide sets the viewport to null first because a default viewport can constrain the window, then waits for the asynchronous resize event:

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await page.setViewport(null);

const resized = page.evaluate(() => new Promise(resolve => {
  window.addEventListener('resize', resolve, { once: true });
}));

await page.resize({ contentWidth: 600, contentHeight: 400 });
await resized;

console.log(await page.evaluate(() => ({
  innerWidth: window.innerWidth,
  innerHeight: window.innerHeight,
  outerWidth: window.outerWidth,
  outerHeight: window.outerHeight,
})));

The documented guide’s sample reports an inner size of 600×400 and an outer size of 600×487. That is an example from its environment, not a fixed browser-UI offset.

Set only the viewport or emulate a device

For viewport-only work, configure it before navigating where possible:

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await page.setViewport({ width: 1080, height: 1024 });
await page.goto('https://example.com');

When connecting to an existing browser, Puppeteer’s current documentation gives ConnectOptions.defaultViewport a default of 800×600. Set it to null to remove that default viewport configuration. Use page.emulate(device) when you need a device’s user-agent and viewport together, and do so before navigation when practical.

What the documented sample output means

The window-management guide shows bounds of 20,20 780x580 normal on its configured 800×600 primary screen. Its additional-screen example reports 850,50 1500x1100 normal on a 1600×1200 screen, then the added screen’s full 1600×1200 dimensions when maximized and 1500×1100 when restored. These values illustrate that example setup; they are not guaranteed Chrome frame measurements for other systems.

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Troubleshooting

  • The window did not visibly change. Check that you are running a visible browser window; viewport configuration and browser-window bounds are distinct controls.
  • windowId is missing or invalid. Obtain it from the relevant page with await page.windowId() and pass that ID to both bounds methods.
  • The content size differs from the requested dimensions. Confirm that the target is the content area, use page.resize(), and account for its experimental status and asynchronous resize event.
  • The viewport is stuck at 800×600. Review defaultViewport; it defaults to 800×600 in the current connect documentation. Use null when removing that default is appropriate.
  • The page reloads after a viewport change. Puppeteer notes that changes involving isMobile or hasTouch can cause reloads. Apply device emulation before navigation where possible.
  • The reported bounds differ from an expected screen size. Treat returned bounds as environment-specific; screen configuration, browser UI, and window state affect the result.
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Example using cURL (see the ScreenshotNeo documentation):

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