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How to Set a Custom Viewport Size in BrowserCat Screenshots

Set BrowserCat’s Playwright viewport with page.setViewportSize before capturing, and choose separately whether to capture the visible area, full page or a specific element.
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With BrowserCat’s Playwright workflow, set the viewport before taking the screenshot: await page.setViewportSize({ width: 390, height: 844 });. The values are viewport dimensions in CSS pixels. Then call page.screenshot() for the visible area, or use fullPage: true if you need the whole document.

Set the viewport before capturing

BrowserCat’s documented approach is to resize the Playwright page, then take the screenshot. Its quick start describes running browser scripts on Chromium in the cloud and recommends Playwright as a starting point. See the BrowserCat quick start and Playwright cheatsheet.

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  1. Connect to a BrowserCat browser using a supported Playwright client and create or obtain a page.
  2. Navigate to the target URL.
  3. Call page.setViewportSize({ width, height }) with the desired width and height.
  4. Capture the page or a specific element.

For example, this JavaScript sequence opens a page at a mobile-sized viewport and writes a screenshot to a file:

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await page.goto('https://example.com');
await page.setViewportSize({ width: 390, height: 844 });
await page.screenshot({ path: 'mobile.png' });

Choose what the screenshot includes

Viewport dimensions control the browser’s layout area, which can affect responsive breakpoints and reflow. Capture extent is a separate choice:

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  • await page.screenshot() captures the current viewport in the documented example.
  • await page.screenshot({ fullPage: true }) captures the entire page.
  • await page.locator('h1').screenshot() captures a particular element.

Changing the viewport does not automatically make a screenshot full-page; pass fullPage: true when you need the whole document.

Understand dimensions and limits

Use CSS-pixel values for width and height. They describe the page’s viewport, not a guaranteed physical output-image size at every device scale. The cited BrowserCat example demonstrates the viewport method but does not specify screenshot scaling behavior.

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The cheatsheet uses 2000 × 1000 as an example, not as a stated service limit. The consulted BrowserCat documentation does not publish minimum or maximum custom viewport dimensions, so check the current service documentation if your workflow depends on unusually large sizes.

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Troubleshoot an unexpected capture

  • The layout still looks like the old viewport: set the viewport before taking the screenshot, as in the documented sequence. If you need the page to render at the intended responsive size, apply the size before capture.
  • The image is only part of the page: the default documented call captures the current viewport. Add fullPage: true to capture the full document.
  • You only need one component: use a locator’s screenshot method, such as page.locator('h1').screenshot().
  • The output image dimensions differ from the CSS viewport values: viewport values are CSS pixels; the documentation does not specify how screenshot scaling affects final image pixels.
  • A very large viewport is rejected or behaves unexpectedly: the cited material does not state supported minimum or maximum dimensions. Consult BrowserCat’s current documentation rather than assuming the 2000 × 1000 example is a limit.
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Or skip the browser setup

If your goal is simply to request a screenshot at a chosen viewport, ScreenshotNeo provides a website screenshot API and MCP server. Its API accepts a URL in one GET request; viewport settings and the other supported parameters are documented at ScreenshotNeo docs.

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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webp

ScreenshotNeo removes cookie banners, newsletter popups and chat widgets before capture; those cleanup steps can be turned off. Bot checks, blank pages, timeouts, failed loads and cache hits are not billed, and response headers identify the page verdict and billing status. Its MCP server includes tools for AI agents to take screenshots, get page information and capture PDFs. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots.

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