The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →To save a webpage as a PDF in its mobile layout, set the browser’s responsive viewport to the target width before loading the page, then generate a PDF with deliberate screen-or-print and page-size settings. A mobile viewport and a narrow PDF page are separate things: choose both if you need the PDF itself to be phone-width. For a visual record rather than a paginated document, capture a screenshot instead.
Choose between a mobile screenshot and a mobile-width PDF
A responsive viewport controls which layout the webpage renders. PDF paper dimensions control the shape of the exported pages. Setting one does not automatically set the other.
| What you need | Use | What to check |
|---|---|---|
| A visual record of the rendered mobile page | Set the responsive viewport and capture a screenshot. Choose a viewport-only or full-page capture depending on whether you need content below the fold. | A screenshot records pixels; it is not a paginated, text-oriented PDF. |
| A paginated PDF document | Set the viewport, then use browser PDF printing or automation. | Print CSS, paper dimensions, margins, scaling, and background settings can all change the output. |
| A repeatable scripted PDF | Use Playwright or Chrome headless. | Set the viewport before navigation and configure PDF options explicitly. |
| Confidence that the page works on an actual phone | Test on a real mobile device. | Desktop device emulation is an approximation, not execution on phone hardware. |
Convert the page manually with Chrome DevTools
- Open the page in Chrome and open DevTools.
- Toggle the device toolbar to enter Device Mode. In responsive mode, enter the desired viewport width and height, or choose a device dimension.
- Navigate to the page or reload it at that size so its responsive CSS is evaluated for the intended viewport.
- Decide whether you need a screenshot or a PDF. DevTools supports capturing the visible viewport or a full-page screenshot; use the browser’s print workflow for a PDF.
- For a PDF, inspect print preview and the exported file. If the browser applies print styling or standard paper proportions rather than the screen layout or narrow page you want, use an automated workflow that exposes media and paper-size settings.
Google describes Device Mode as a simulation and a first-order approximation; it does not run the page on a real mobile device, and some mobile-specific behavior cannot be simulated. See Chrome’s Device Mode guide.
Generate a mobile-width PDF with Playwright
Set the viewport before navigating. Playwright’s page.pdf() uses print CSS by default. If you want the screen-rendered styling, explicitly emulate screen media before calling it. Then set the PDF page size and margins to match the document you need.
#1 Best Overall
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const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const page = await browser.newPage({
viewport: { width: 390, height: 844 }
});
await page.goto('https://example.com', { waitUntil: 'networkidle' });
// Keep screen styles instead of page print styles.
await page.emulateMedia({ media: 'screen' });
await page.pdf({
path: 'mobile-page.pdf',
width: '390px',
height: '844px',
margin: { top: '0', right: '0', bottom: '0', left: '0' },
printBackground: true
});
await browser.close();
})();Replace the example URL and viewport dimensions with your target. The example creates a PDF page sized to the chosen viewport dimensions; it does not automatically make a multi-page document with one page per mobile screen. For a flowing document, choose a paper height and margins that suit the content, then inspect how it paginates.
Set the viewport and PDF options for the intended result
- Viewport: width is the key input for triggering responsive breakpoints; choose the CSS-pixel width you want to reproduce. Set the viewport before navigation because many sites are not designed to have their window resized after loading.
- Media: use
page.emulateMedia({ media: 'screen' })beforepage.pdf()when screen CSS is required. Omit it if you want the site’s print styling. - Page size: use
widthandheightfor explicit dimensions, orformatfor a standard paper size. A standard format may be wider than a phone layout. - Units: Playwright interprets unlabeled numeric PDF dimensions as pixels and accepts units such as
px,in,cm, andmm. - Margins and scale: adjust them to prevent clipping or unwanted whitespace. These affect the page output independently of the viewport.
- Backgrounds: set
printBackground: trueif background graphics should appear in the PDF. - CSS page size: consider
preferCSSPageSizeif the page’s CSS page-size rules should take precedence over the configured PDF size.
See the Playwright Page API reference for the current viewport and PDF options.
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Use Chrome headless or the DevTools Protocol
Chrome headless command line
Chrome headless can write a page to PDF with --print-to-pdf. For pages that need additional loading time, its command-line reference documents --timeout; use --no-pdf-header-footer to omit generated headers and footers.
chrome --headless --print-to-pdf=output.pdf https://example.comThe command above prints the page to PDF, but it does not itself establish the mobile viewport required to trigger responsive styling. Use an automation route that sets a viewport if mobile rendering must be controlled. Flag availability can vary by Chrome version, so check the documentation for the installed version if Chrome rejects an option. See Chrome’s headless command-line reference.
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Rank #3
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Chrome DevTools Protocol
For lower-level browser automation, the DevTools Protocol method Page.printToPDF exposes paper width and height, margins, orientation, scale, and header/footer templates. Configure those output dimensions deliberately; they are PDF page controls, not a substitute for setting the page’s responsive viewport. The protocol reference is Page.printToPDF.
Inspect and troubleshoot the exported PDF
There is no universal one-click setting that guarantees a mobile-width PDF across sites. Check the exported file in a PDF viewer, especially when the page has dynamic content or print-specific CSS.
Rank #4
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| Symptom | Likely cause | What to try |
|---|---|---|
| The page looks like a desktop layout | The viewport was not set to the intended width before navigation, or the site’s breakpoint differs from the assumed device size. | Set the target CSS-pixel viewport before loading the URL, then confirm the rendered page is in its mobile layout. |
| The PDF looks different from the browser | PDF generation uses print CSS by default, or the website defines print-only layout rules. | In Playwright, emulate screen media before PDF generation if screen styling is desired; otherwise retain print styling intentionally. |
| The PDF is standard-paper width instead of phone width | The PDF paper size was left to defaults or set to a standard format. | Set PDF width and height explicitly. Remember that this changes the PDF page dimensions, not the responsive viewport. |
| Content is clipped, too small, or split unexpectedly | Page dimensions, margins, scaling, or pagination do not fit the content. | Review width, height or format, margins, and scale; inspect page breaks and overflow in the resulting file. |
| Background colors or images are missing | Background printing is disabled or the page does not print those elements. | Enable Playwright’s printBackground option where appropriate and inspect whether print CSS changes the page. |
| Content is absent or incomplete | The page had not finished rendering dynamic content when captured. | Wait for the specific content or readiness condition your page requires before generating the PDF. Chrome headless documents a timeout option, but there is no universally correct wait duration. |
| A Chrome command-line flag is rejected | The installed Chrome version may not support that flag. | Check the command-line documentation for the installed version and adjust the command accordingly. |
Or skip the browser setup
ScreenshotNeo provides a screenshot API and MCP server. Its one-call endpoint returns an image or PDF; the following cURL example requests a PDF at a 390-pixel viewport width. See the ScreenshotNeo API documentation for available parameters and output settings.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com --data-urlencode width=390 --data-urlencode format=pdf -o mobile-page.pdfScreenshotNeo accepts cookie or consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, with the page verdict and billing status reported in response headers. Its MCP server lets AI agents use take_screenshot, get_page_info, and capture_pdf. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 shots.
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When desktop emulation is not enough
Chrome Device Mode helps reproduce responsive layouts, but it does not run the page on a phone. If the page’s behavior depends on actual mobile hardware or browser behavior, validate the result on a real device as well as checking the PDF. For a technical distinction between emulation and device testing, see Google’s Device Mode documentation.
Quick Recap
Best Value
- 【PKYAA Double Sided Silicone Suction Phone Case Mount】PKYAA With Double Sided 40 Strong and Reliable individual suction cups, PKYAA provides a thicken and upgraded universal silicon suction mount for your phone.
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- 【Press Down Firmly Every 30 Minutes】Use your palm or fingers to press the phone down firmly and check it's secure before letting go. Apply even pressure for a few seconds to allow the suction cup to adhere properly. To maintain the grip and prevent accidental falls, it's a good practice to periodically reapply pressure to the suction cup.
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