If a BrowserCat screenshot has the wrong size, check three separate settings: the page’s CSS viewport, the screenshot’s pixel scale, and whether you captured the visible viewport or the full page. Set the intended viewport before capture, choose a scale deliberately, and verify both the browser measurements and the saved image dimensions. BrowserCat documents use with standard Playwright, Puppeteer, and CDP-compatible clients; the reviewed official materials do not establish a separate BrowserCat-only width or height setting.
Why a screenshot’s dimensions can differ from what you expected
“Size” can mean either the dimensions the browser uses to lay out the page or the pixel dimensions of the image file. These are related, but not interchangeable: the CSS viewport determines the layout area, while screenshot scale and device-pixel ratio can affect the bitmap dimensions. The capture area is a third choice: a screenshot can show just the visible viewport or the full scrollable page.
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BrowserCat describes its service as managed browser infrastructure and supports standard Playwright, Puppeteer, and CDP-compatible clients. Its reviewed overview does not specify screenshot width or height defaults or a BrowserCat-specific sizing switch. Configure the browser and screenshot through the automation client you use. BrowserCat’s site and documentation describe its browser service and automation support.
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Diagnose the mismatch before changing settings
- Measure the saved image. Read the PNG or JPEG’s actual pixel width and height using an image viewer or image-inspection tool. A preview may scale the image to fit, so do not infer its dimensions from how large it appears on screen.
- Measure the page in the same browser session. Record the configured viewport and evaluate
window.innerWidth,window.innerHeight, andwindow.devicePixelRatio. These show whether the page laid out at the intended CSS size and what device-pixel ratio applied. - Compare layout dimensions with file dimensions. If the page’s CSS viewport is wrong, adjust the viewport. If the CSS viewport is right but the output bitmap is larger or smaller, inspect screenshot scale and device-pixel ratio. If only the height is unexpected, check whether full-page capture is enabled.
- Change one setting at a time, then measure again. Keep the page, viewport, device scale factor, screenshot scale, and capture mode constant when comparing results.
Set the intended viewport and scale in Playwright
In Playwright, set the viewport on the browser context or page before navigating or taking the screenshot. Then choose the screenshot scale explicitly. The example uses a 1280-by-800 CSS viewport, a device scale factor of 1, and CSS-pixel output; change the viewport values to match your intended layout.
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const page = await browser.newPage({
viewport: { width: 1280, height: 800 },
deviceScaleFactor: 1,
});
await page.goto(url);
console.log(await page.evaluate(() => ({
innerWidth: window.innerWidth,
innerHeight: window.innerHeight,
devicePixelRatio: window.devicePixelRatio,
})));
await page.screenshot({
path: 'capture.png',
fullPage: false,
scale: 'css',
});With scale: 'css', the image uses one output pixel per CSS pixel. Use scale: 'device' when you want device-pixel-density output; in that mode, bitmap dimensions can differ from the CSS viewport dimensions. Check the saved file rather than assuming the preview reflects its pixel size. Playwright options can vary by installed library version, so consult the API reference for that version: Playwright’s screenshot API.
Choose viewport or full-page capture
The capture mode controls how much of the document is included. Playwright’s fullPage option defaults to false; enable it to capture the full scrollable page instead of only the visible viewport. A clip rectangle can constrain the captured region.
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| Mode | What it captures | When to use it |
|---|---|---|
Viewport (fullPage: false) |
The currently visible browser area | When the image should match the configured viewport height |
Full page (fullPage: true) |
The full scrollable document | When the image should include content below the fold; its height follows the document rather than just the viewport |
Clipped region (clip) |
The rectangle specified for the capture | When only a particular part of the page is needed |
For a full-page capture, change the example’s screenshot call to await page.screenshot({ path: 'capture.png', fullPage: true, scale: 'css' });. If the image is unexpectedly tall, check fullPage first; if it is unexpectedly wide, check the viewport width and any clip rectangle.
Match the symptom to the setting
| Symptom | First setting to inspect | Reason |
|---|---|---|
| Image is wider or narrower than the target layout | Viewport width and any clip rectangle |
They affect the CSS layout width or the captured region. |
| Image is taller than expected | fullPage, then viewport height |
Full-page mode includes the scrollable document. |
| Pixel dimensions are a multiple of the expected CSS dimensions | Screenshot scale, device scale factor, and window.devicePixelRatio |
Device-pixel output can differ from CSS-pixel dimensions. |
| Responsive layout looks like the wrong breakpoint | window.innerWidth at capture time |
The page responds to its CSS viewport, not how large the image preview looks. |
| Only a portion of the page appears | fullPage and clip |
The capture may be limited to the viewport or a specified rectangle. |
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Frequently Asked Questions
Why are my screenshots twice as large as the viewport?
Check whether the screenshot uses device-pixel scale and inspect the page’s device-pixel ratio. Use CSS-pixel scale if you want one image pixel per CSS pixel.
How do I set screenshot width and height?
Set the browser viewport width and height before navigation or capture. Then choose screenshot scale and capture mode, since scale and full-page capture affect the saved file dimensions.
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