Most “ignored” Puppeteer PDF sizes are precedence or print-layout problems, not a broken PDF writer. A PDF can be controlled by Puppeteer’s format, width, and height options, or by the page’s CSS @page rule. If both layers specify a size, you must deliberately choose which one wins. Puppeteer also renders with print media by default, applies margins, and fragments overflowing content into additional pages.
The reliable fix is to choose one page-size owner, remove conflicting declarations, set margins explicitly, wait for layout-critical assets, and inspect the result using print styles and the exact Chromium version used in deployment.
How Puppeteer decides the PDF paper size
page.pdf() generates a paged print document rather than a screenshot of the current browser viewport. Its relevant options are format, width, height, margin, landscape, and preferCSSPageSize.
The precedence rule
When format is present, it takes priority over explicit width and height. A CSS @page size normally does not replace the API paper size. Set preferCSSPageSize: true to give a CSS @page declaration priority over format, width, and height; otherwise the content is scaled to fit the API-selected paper.
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That produces two stable configuration patterns:
- API-owned: use a named format or dimensions, remove competing
@page { size: ... }rules, and leavepreferCSSPageSize: false. - CSS-owned: define one explicit
@pagesize and margin, setpreferCSSPageSize: true, and do not pass contradictory API dimensions.
Defaults that make a correct setting look wrong
Chrome’s underlying print protocol uses inches for paper dimensions. Its default paper is approximately 8.5 × 11 inches (Letter), with margins of about 1 cm on each side. Puppeteer’s own margin option and CSS @page margins can add another layer. A correctly sized sheet can therefore show a visible border or a smaller content area.
Use physical units such as mm, cm, or in for custom dimensions. Numeric values are accepted, but strings make the intended physical size unambiguous.
Fix 1: let Puppeteer own the size
Start with a named standard format. It removes custom-unit rounding from the diagnosis and gives you a known baseline.
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://example.com', { waitUntil: 'networkidle0' });
await page.evaluate(() => document.fonts.ready);
await page.pdf({
path: 'out.pdf',
format: 'A4',
landscape: false,
margin: {
top: '0mm',
right: '0mm',
bottom: '0mm',
left: '0mm'
},
preferCSSPageSize: false,
printBackground: true,
waitForFonts: true
});
await browser.close();
})();For US Letter, replace format: 'A4' with format: 'Letter'. If custom paper is required, remove format entirely:
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path: 'label.pdf',
width: '100mm',
height: '150mm',
margin: { top: '0mm', right: '0mm', bottom: '0mm', left: '0mm' },
preferCSSPageSize: false,
printBackground: true
});Do not pass format together with custom width and height when the custom dimensions are supposed to win; format wins.
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Fix 2: let CSS own the size
CSS ownership is useful for invoices, labels, and layouts already designed for printed paper. Put one physical size in @page and enable CSS precedence.
@page {
size: 210mm 297mm;
margin: 0;
}
@media print {
html, body {
margin: 0;
}
}
await page.pdf({
path: 'out.pdf',
preferCSSPageSize: true,
printBackground: true,
waitForFonts: true
});For landscape A4, use size: A4 landscape or swap the dimensions. Do not simultaneously request a contradictory API format. Keep a single @page rule where possible; multiple rules from component or third-party stylesheets make ownership difficult to audit.
Print media is not screen media
Puppeteer’s PDF method uses the print CSS media type by default. Rules under @media print can change widths, display values, visibility, overflow, and fixed heights. The viewport configured with page.setViewport() controls browser layout conditions, but it does not define PDF paper size.
To deliberately reproduce screen styling, switch media before printing:
await page.emulateMediaType('screen');
await page.pdf({ path: 'screen-styled.pdf', format: 'A4' });To debug the normal PDF path, use await page.emulateMediaType('print') and inspect the computed styles in that state. Printed colors may also be adjusted. If exact colors matter, add:
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@media print {
* {
-webkit-print-color-adjust: exact;
print-color-adjust: exact;
}
}Why borders, clipping, and extra pages remain
Margins at more than one layer
Protocol defaults, Puppeteer’s margin, and CSS @page margins can all affect the result. Set one intended margin explicitly and remove the others while diagnosing. Also check the body’s default margin and print-specific margins.
Content exceeds the printable box
Chrome fragments content whenever the content box is larger than the available page area. A one-pixel border, fractional custom dimension, transformed element, fixed height, or horizontal overflow can push a final fragment onto a new page. Temporarily remove body margins, borders, transforms, and overflow rules. Reintroduce them one at a time in a minimal document.
Late fonts and images
A PDF captured before fonts or images settle can reflow after the intended measurement, changing page breaks. Wait for navigation, then wait for fonts and critical images:
await page.goto(url, { waitUntil: 'networkidle0' });
await page.evaluate(async () => {
await document.fonts.ready;
const images = Array.from(document.images);
await Promise.all(images.map(img => {
if (img.complete) return Promise.resolve();
return new Promise(resolve => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
});
}));
});waitForFonts is documented with a default of true in current Puppeteer, but application code still needs to ensure that asynchronous content and images have arrived.
Custom-size rounding
Historical reports describe small width or height discrepancies and repeated edge artifacts with some custom dimensions. Treat this as browser-version-sensitive rather than a universal Puppeteer rule. First reproduce with a named A4 or Letter format; if that works, compare your custom dimensions and the exact Chromium version.
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A repeatable diagnostic procedure
- Log the final options object. Confirm whether a wrapper, helper, or environment variable adds
format, dimensions, margins, orpreferCSSPageSize. - Search every loaded stylesheet. Look for
@page,@media print,size:,margin,transform, fixedheight, and overflow rules. - Choose an owner. Use either API-owned or CSS-owned sizing, not both.
- Baseline with A4 or Letter. A standard format distinguishes precedence errors from custom-size rounding.
- Set margins explicitly. Use zero margins for a full-bleed test or the exact physical values required by the document.
- Wait for layout inputs. Complete navigation, fonts, images, data fetches, and client-side rendering before calling
page.pdf(). - Inspect print styles. Measure the DOM after print emulation and check which elements overflow the page box.
- Inspect the PDF itself. Verify physical page dimensions with a PDF inspector, not only a viewer’s zoom or fit-to-window display.
- Reproduce on deployment versions. Compare the exact Puppeteer and Chromium versions used locally and in production; print behavior can change with browser updates.
Common symptoms and targeted fixes
| Symptom | Likely cause | First fix |
|---|---|---|
format: 'A4' appears ignored |
A wrapper passes another option, or CSS is given priority | Log options; remove conflicting dimensions; set preferCSSPageSize: false unless CSS should own the size |
| Custom width and height do not apply | format is present |
Remove format and keep physical-unit dimensions |
| Unexpected white border | Protocol, Puppeteer, CSS, or body margins | Set all intended margins explicitly and inspect @page and print body styles |
| Screen layout differs in PDF | Print media rules | Inspect with print emulation, or call emulateMediaType('screen') when screen rules are intentional |
| Blank or extra final page | Overflow, borders, transforms, fractional dimensions, or content fragmentation | Strip those styles in a minimal reproduction, then add them back incrementally |
| Text shifts between runs | Fonts, images, or async content are late | Wait for navigation, document.fonts.ready, images, and application data |
| Colors look washed out | Print color adjustment | Use -webkit-print-color-adjust: exact where exact colors are required |
Reliability and performance considerations
Use a single browser instance with controlled pages for batch work, but isolate jobs whose scripts or cookies could interfere. Reuse a deterministic viewport and user agent. Avoid relying on an arbitrary sleep as the only readiness condition; wait for a selector, network state, fonts, and images that define your actual layout.
Keep the PDF options in one logged configuration object. This makes differences between local and production runs visible and prevents a helper from silently adding a conflicting format. For custom paper, record the physical units and the browser version alongside the generated file so a later discrepancy can be reproduced.
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ScreenshotNeo provides a website screenshot and PDF API when you do not want to maintain Puppeteer and Chromium. Its PDF endpoint accepts paper size, margins, landscape mode, and page ranges, while its capture options cover full-page output, CSS selectors, custom CSS and JavaScript, waiting conditions, headers, cookies, user agents, timezone, geolocation, and more. Before capture it accepts cookie or consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each step can be disabled.
Only clean shots are billed. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and each response identifies the result with X-Page-Verdict and X-Billed headers. An MCP server lets Claude, Cursor, and other MCP clients use take_screenshot, get_page_info, and capture_pdf.
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 documentation for PDF parameters and the full API. Equivalent calls:
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import requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
timeout=90
)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`${res.status} ${res.statusText}`);
require('fs').writeFileSync('shot.webp', Buffer.from(await res.arrayBuffer()));The Free plan includes 1,000 shots per month with no card. Paid plans start at $5 for 3,000 shots; every feature is on every plan. Create a free ScreenshotNeo account.
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When to use each ownership model
| Requirement | Recommended owner | Configuration |
|---|---|---|
| Stable standard paper such as A4 or Letter | Puppeteer API | format, explicit margins, preferCSSPageSize: false |
| Custom label or print layout already defined in CSS | CSS | One @page rule, preferCSSPageSize: true |
| Screen appearance rather than print appearance | Media emulation plus either size owner | emulateMediaType('screen'), then explicit PDF size |
| Production capture without browser maintenance | Hosted API | Use ScreenshotNeo’s documented endpoint and options |
Frequently Asked Questions
Does changing page.setViewport() change the PDF paper size?
No. It changes the browser’s layout viewport. Set paper dimensions with page.pdf() or a CSS @page rule.
Can I use preferCSSPageSize without writing an @page rule?
You can, but there is no CSS size to take precedence. Define an explicit @page size when CSS ownership is intended.
Why does a PDF viewer report a different size than my CSS pixels?
CSS pixels describe layout; PDF dimensions are physical units. Verify the page box in a PDF inspector and keep dimensions in mm, cm, or in.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsShould I fix an extra page with a smaller viewport?
Usually not. An extra page is caused by print-area overflow or fragmentation. Inspect margins, borders, transforms, fixed heights, and fractional dimensions first.
Quick Recap
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