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To capture a website in a mobile viewport, use Chrome DevTools or Firefox Responsive Design Mode for a one-off image, or Playwright when you need repeatable captures. First decide whether you need only the visible phone-sized viewport or the entire scrollable page: the former is a viewport screenshot; the latter is a full-page screenshot.
Choose the capture method and image extent
Your choice depends on repeatability and what the image must contain.
| Need | Best option | Result |
|---|---|---|
| One quick image while inspecting a page | Chrome Device Mode or Firefox Responsive Design Mode | Manual screenshot saved locally |
| The same URL at several phone sizes | Playwright | Scripted, repeatable files |
| Only what is currently visible | Browser capture or Playwright default screenshot | Viewport image |
| Everything from the top to the bottom | Chrome “Capture a full size screenshot” or Playwright fullPage: true |
Full-page image |
A device preset can also set user-agent, touch and device-pixel-ratio values. Use those only when they are relevant to the behavior you are checking; a precise custom width and height is often clearer for a layout review.
Capture a mobile viewport with Chrome DevTools
- Open the target page in Chrome.
- Open DevTools with More tools → Developer tools, then click Toggle device toolbar. Device Mode starts with responsive dimensions.
- In the Dimensions control, choose a phone preset or enter an exact width and height. Use the rotate control for landscape. Device Mode also exposes device-pixel ratio and device-type settings.
- Reload the page at that size. Wait for fonts, images and any client-side content to finish loading. Put the page in the state you want to document—for example, open a menu or scroll to a section.
- Open the Device Mode More options menu. Choose Capture screenshot for the visible viewport, or Capture a full size screenshot for the whole page.
Use a custom device when a named preset is not appropriate
Open the device list and choose Edit, then add a custom device with its name, width and height. DPR, user agent and device type are optional fields. Record the values with the image if another person must reproduce it.
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Make the capture representative
- Reload after changing dimensions so responsive breakpoints recalculate.
- Dismiss or document cookie banners and sign-in prompts if they are not part of the test.
- Scroll to the intended position before a viewport capture; a viewport image contains only what is on screen.
- For lazy-loaded content in a full-page capture, scroll through the page first so images have an opportunity to load.
Capture a mobile viewport with Firefox
- Open Firefox Responsive Design Mode from the Browser Tools menu or Developer Tools toolbox. The shortcut is
Ctrl+Shift+Mon Windows/Linux andCmd+Option+Mon macOS. - Select a listed device or edit the width and height. Set portrait or landscape orientation and DPR as needed.
- For a custom device, define screen size, DPR, user agent and touch support.
- Prepare the page state, then click the camera button. Firefox saves the image to its default download location; Firefox can also be configured to copy screenshots to the clipboard.
Responsive Design Mode includes touch simulation and approximate network throttling. Those controls are useful when you are checking interaction or loading behavior, not just producing a picture.
Automate captures with Playwright
Playwright is preferable when a capture belongs in CI, must be regenerated, or needs several browsers and viewport sizes. Install it in a Node.js project with npm install -D playwright, then install the browser binaries with npx playwright install.
Use a named phone descriptor
const { chromium, devices } = require('playwright');
(async () => {
const browser = await chromium.launch();
const context = await browser.newContext({
...devices['iPhone 13'],
});
const page = await context.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.screenshot({ path: 'mobile.png' });
await browser.close();
})();The default screenshot is the visible page area. For the complete scrollable document, use:
await page.screenshot({ path: 'mobile-full.png', fullPage: true });Playwright descriptors include viewport and screen settings, user agent and touch capability. A descriptor assumes a particular platform; adjust its user-agent setting if that assumption does not match your intended check.
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Use an explicit viewport and output scale
const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const context = await browser.newContext({
viewport: { width: 390, height: 844 },
deviceScaleFactor: 3,
isMobile: true,
hasTouch: true,
});
const page = await context.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.screenshot({
path: 'phone-390.png',
type: 'png',
scale: 'css',
});
await browser.close();
})();The screenshot API supports PNG, JPEG and WebP. scale: 'css' creates one output pixel per CSS pixel; scale: 'device' uses device pixels and can make a high-DPI image larger. Set type: 'jpeg' with a quality value when a smaller photographic file is more useful.
Capture several phone sizes
const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const sizes = [
{ name: 'small', width: 320, height: 568 },
{ name: 'standard', width: 390, height: 844 },
{ name: 'large', width: 430, height: 932 },
];
for (const size of sizes) {
const context = await browser.newContext({
viewport: { width: size.width, height: size.height },
isMobile: true,
hasTouch: true,
});
const page = await context.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle' });
await page.screenshot({ path: `home-${size.name}.webp`, type: 'webp' });
await context.close();
}
await browser.close();
})();Wait for a reliable visual state
networkidle is useful for pages that finish their requests, but it is not a guarantee that a chart, animation or lazy image is ready. For deterministic output, wait for a meaningful selector or a short, justified delay:
await page.goto('https://example.com');
await page.locator('main').waitFor();
await page.waitForTimeout(500);
await page.screenshot({ path: 'ready.png' });Disable or freeze animations in your test CSS when a moving element makes pixel comparisons unstable. Keep the same browser version, fonts and viewport values between runs.
Viewport image or full-page image?
Visible viewport
A viewport screenshot answers “What would be visible in this phone-sized window at this scroll position?” It is the right artifact for a hero section, menu state, fold comparison or bug report. In Playwright, omit fullPage; in Chrome choose Capture screenshot.
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Full scrollable page
A full-page screenshot answers “What is on the page from top to bottom?” It is useful for design review and documentation, but it can be very tall, include repeated sticky headers and expose content that a visitor would reach only by scrolling. In Playwright set fullPage: true; in Chrome choose Capture a full size screenshot.
Lazy content and sticky elements
Before a full-page capture, scroll through pages that lazy-load images. Check the result for duplicated fixed navigation, missing fonts and sections that render only after interaction. If a page is extremely long, capture logical sections instead of creating an unwieldy single bitmap.
What mobile emulation can and cannot prove
Chrome describes Device Mode as a “first-order approximation of how your page looks and feels on a mobile device.” The browser is still running on a desktop or laptop, so emulation does not reproduce every mobile CPU, browser implementation or hardware condition. A screenshot can therefore validate responsive layout at chosen dimensions without proving performance or behavior on a physical phone.
- Use emulation for breakpoint checks, visual regression, content visibility and quick documentation.
- Use a real device when results depend on mobile CPU architecture, hardware performance, browser-specific behavior, sensors or an actual touch interaction.
- Do not label an emulated image as a photograph or screenshot taken on a phone.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. A single request returns a PNG, JPEG, WebP or PDF, and its options include 12 device presets, custom viewports, retina scale and full-page capture with lazy images loaded. You can also capture one CSS-selected element, set dark mode, add custom CSS or JavaScript, click before capture, wait for a selector, delay or network idle, and set headers, cookies, user agent, authorization, timezone or geolocation.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting mobile screenshots
The image is desktop-sized
In DevTools, confirm the device toolbar is enabled and that the dimensions show the intended width. In Playwright, set viewport on the browser context, not only on a page after navigation.
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Wait for a meaningful selector, allow client-side rendering to finish and inspect the browser console. A blocked request, authentication wall or bot check can prevent the content from loading. For full pages, scroll to trigger lazy loading.
The screenshot is too large
Use CSS scale instead of device scale, choose WebP or JPEG, reduce the viewport dimensions, or capture sections. A high-DPI device factor intentionally produces more pixels.
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Fonts or icons differ between runs
Install the same fonts in the capture environment, keep browser versions consistent and wait for document.fonts.ready before capturing. Avoid comparing screenshots made with different rendering environments.
A menu or cookie dialog is missing
Automation does not infer your intended state. Click the control or set the required storage state before the screenshot, and wait for the resulting selector. In a manual capture, perform the interaction at the chosen viewport first.
The full-page image repeats a header
Sticky and fixed elements remain fixed while the page is stitched. Hide them with test CSS, capture sections, or accept the repetition when it documents the actual mobile experience.
Practical checklist
- Define the exact width, height, orientation and (if relevant) DPR.
- Choose viewport-only or full-page output before capturing.
- Load the page and wait for fonts, images and app content.
- Set the required cookie, login and interaction state.
- Use a consistent browser, font set and output scale for comparisons.
- Validate important behavior on a physical phone.
- Keep the URL, dimensions, browser and capture date with the image.
Frequently Asked Questions
Can I capture a mobile screenshot without installing software?
Yes. Chrome and Firefox include responsive device modes that save screenshots directly from the browser.
Should I use a phone preset or custom dimensions?
Use a preset when you want a known device profile; use custom dimensions when a breakpoint or design specification requires exact width and height.
Which format is best for a mobile screenshot?
PNG is suitable for crisp interface details, while WebP or JPEG can reduce file size. Playwright supports all three.
Does a full-page screenshot include content below the fold?
Yes. It captures the scrollable document rather than only the currently visible viewport, although lazy content and fixed elements need review.
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