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Set Puppeteer’s deviceScaleFactor in page.setViewport() before navigating, then capture the page with page.screenshot(). This controls the device scale used to render the page; Sharp’s resize() changes the image after capture. They solve different problems and can be used together.
Set Puppeteer’s device scale factor before navigation
In Node.js Puppeteer, provide the CSS viewport width and height and the desired deviceScaleFactor to page.setViewport(). The documented default scale factor is 1. A value of 2 emulates a device scale factor of 2; the resulting pixel dimensions depend on the capture area and settings, so inspect the image when exact dimensions matter.
const puppeteer = require('puppeteer');
async function capture(url) {
const browser = await puppeteer.launch();
try {
const page = await browser.newPage();
await page.setViewport({
width: 640,
height: 480,
deviceScaleFactor: 2,
});
await page.goto(url);
const screenshot = await page.screenshot({ path: 'shot.png' });
return screenshot;
} finally {
await browser.close();
}
}
capture('https://example.com').catch((error) => {
console.error(error);
process.exitCode = 1;
});The viewport dimensions are expressed in CSS pixels. Puppeteer documents that page.setViewport() resizes the page and advises setting the viewport before navigation, since sites may not expect their size to change after loading. Puppeteer viewport API
Choose between browser-rendered density and final image size
Use Puppeteer’s scale factor for device-scale rendering
deviceScaleFactor changes the device metrics Puppeteer uses while rendering. Set it on the viewport before loading the page when you want the browser capture to use an emulated device scale factor. The expected relationship between scale and output pixel dimensions follows from the DPR setting, but should not be treated as a guarantee for every full-page, clipped, or differently configured capture.
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Use Sharp resize for explicit bitmap dimensions
Sharp operates on the captured bitmap. Its resize() method can fit, crop, stretch, or constrain the output image; it does not set Puppeteer’s device scale factor. This example preserves aspect ratio and avoids cropping or stretching while fitting within 1200 by 900 pixels:
const sharp = require('sharp');
const output = await sharp(screenshot)
.resize({ width: 1200, height: 900, fit: 'inside' })
.toBuffer();
const metadata = await sharp(output).metadata();
console.log({ width: metadata.width, height: metadata.height });With fit: 'inside', the output can be smaller than both bounds when the input’s aspect ratio requires it. Select a different fit mode when that is not the intended result:
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cover: preserve aspect ratio and crop to cover the target.contain: preserve aspect ratio and fit within the target.fill: stretch to the target dimensions.inside: fit within maximum dimensions.outside: ensure the image meets minimum dimensions, potentially exceeding one bound.
Sharp exposes output dimensions through image metadata. Its density or DPI option is separate from pixel resizing; changing DPI metadata is not a substitute for choosing bitmap dimensions. Sharp resize API Sharp output API
Choose the screenshot area and format separately
The viewport scale factor is independent of the options that define what page.screenshot() captures and how it encodes the result. Puppeteer supports viewport or full-page captures, a clip rectangle, transparency, image formats, and quality for lossy formats. Quality does not apply to PNG. Use element screenshots when a particular element is the target; Puppeteer’s guide notes that it attempts to scroll a hidden element into view before capturing it.
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// Full-page PNG
await page.screenshot({ path: 'full.png', fullPage: true });
// Capture a rectangular region
await page.screenshot({
path: 'region.png',
clip: { x: 0, y: 0, width: 640, height: 480 },
});
// JPEG with a lossy-format quality setting
await page.screenshot({ path: 'page.jpg', type: 'jpeg', quality: 85 });
// Capture a specific element
const element = await page.$('main');
if (!element) throw new Error('Target element was not found');
await element.screenshot({ path: 'main.png' });Check the installed Puppeteer version’s API documentation if you rely on version-specific behavior. The official API pages referenced here identify Puppeteer 25.12.0 as current on October 3, 2026. Puppeteer screenshot API Puppeteer screenshots guide
Check dimensions and troubleshoot unexpected output
When the image dimensions are wrong, inspect the captured file’s pixel metadata first. Then work through the settings in the order they affect the result:
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- Confirm the width, height, and
deviceScaleFactorpassed topage.setViewport(). - Check whether
fullPageorclipchanged the captured area. - Check whether Sharp resized, cropped, or otherwise transformed the image after capture.
- Compare pixel dimensions, not just DPI or density metadata.
- Capture looks like the default scale: ensure the factor is set in
page.setViewport()beforepage.goto(), rather than relying on a later resize. - Width or height differs from the viewport: determine whether the screenshot is full-page or clipped; those settings change the capture area.
- Output has an unexpected crop or shape: inspect Sharp’s
fitmode.covercrops,fillstretches, andinsidemay produce dimensions below one or both limits. - A hidden element is missing: use the element screenshot API and confirm the selector matches an element; the guide says Puppeteer attempts to scroll a hidden element into view.
- PNG quality appears unchanged: the screenshot quality setting applies to lossy formats, not PNG.
Use Puppeteer Sharp for .NET
Puppeteer Sharp is a .NET port of the official Node.js Puppeteer API. Its documentation demonstrates setting a viewport before generating a screenshot, but use the option names and syntax for the version installed in your project rather than copying JavaScript directly into C#. Puppeteer Sharp documentation
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ScreenshotNeo provides a screenshot API and MCP server. Its one-call API returns an image or PDF; the response includes page-verdict and billing headers.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options. Cookie banners, popups, and chat widgets are removed before the shot; bot checks, blank pages, and failed loads are not billed. Its MCP server lets AI agents take screenshots. The Free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for 1,000 free screenshots a month, with no card required.
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