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Use a print-only, fixed-position frame instead of putting a border on a normal flowing container. Define the paper size and breathing room with @page, reset browser margins, then draw the frame with a fixed pseudo-element. Chromium-based Playwright and Puppeteer workflows generally paint that frame on every printed page, but you should inspect output from the exact browser version you deploy.
The reliable pattern: print geometry plus a fixed frame
A border on body or on a wrapper such as .document belongs to the normal flow. When the wrapper becomes several physical pages, its border is one continuous box: it may appear only at the beginning and end, or its sides may be clipped at a page break. A repeating page border needs to be attached to the printed page rather than to flowing content.
The following CSS establishes A4 pages, leaves a 12 mm margin around the content area, and paints a one-pixel frame on every printed page:
@media print {
@page {
size: A4;
margin: 12mm;
}
html,
body {
margin: 0;
padding: 0;
}
.pdf-page-frame::before {
content: "";
position: fixed;
inset: 0;
border: 1px solid #222;
box-sizing: border-box;
pointer-events: none;
}
}Wrap all printable content in <div class="pdf-page-frame">…</div>. The pseudo-element is fixed to the page viewport, so Chromium print layout can repaint it for each physical page. This is an implementation pattern, not a promise made by every HTML-to-PDF engine; verify page repetition, clipping, and color in your production engine and version.
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A complete HTML document
This self-contained example includes enough content to create multiple pages. The screen stylesheet is deliberately separate from the print stylesheet, so the frame does not appear while someone views the page in a normal browser tab.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Quarterly report</title>
<style>
body {
font-family: system-ui, sans-serif;
color: #222;
line-height: 1.45;
}
.report {
max-width: 760px;
margin: 0 auto;
}
h1, h2 { break-after: avoid; }
table { width: 100%; border-collapse: collapse; }
th, td { border: 1px solid #bbb; padding: 6px; }
@media print {
@page {
size: A4;
margin: 12mm;
}
html, body {
margin: 0;
padding: 0;
}
.pdf-page-frame::before {
content: "";
position: fixed;
inset: 0;
border: 1px solid #222;
box-sizing: border-box;
pointer-events: none;
}
.report { max-width: none; }
.no-print { display: none !important; }
}
</style>
</head>
<body>
<div class="pdf-page-frame">
<main class="report">
<h1>Quarterly report</h1>
<p>Your flowing report content goes here.</p>
<!-- Add enough sections, tables, or paragraphs to span pages. -->
</main>
</div>
</body>
</html>Generate the PDF with Playwright
Playwright’s page.pdf() uses the print CSS media type. Set printBackground: true when the frame or other design depends on painted backgrounds, and set preferCSSPageSize: true when the @page rule should control paper size.
import { chromium } from 'playwright';
const browser = await chromium.launch();
const page = await browser.newPage();
await page.goto('http://localhost:3000/report.html', { waitUntil: 'networkidle' });
await page.pdf({
path: 'report.pdf',
format: 'A4',
printBackground: true,
preferCSSPageSize: true,
margin: { top: '0', right: '0', bottom: '0', left: '0' }
});
await browser.close();The zero API margins prevent a second margin from being added outside the CSS geometry. If you instead want the API to decide the paper size and margins, remove preferCSSPageSize and configure those values in the call; do not mix two unrelated margin systems accidentally.
Generate the same PDF with Puppeteer
Puppeteer’s Page.pdf() also renders with print CSS by default and exposes the same core controls:
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(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('http://localhost:3000/report.html', { waitUntil: 'networkidle0' });
await page.pdf({
path: 'report.pdf',
format: 'A4',
printBackground: true,
preferCSSPageSize: true,
margin: { top: '0', right: '0', bottom: '0', left: '0' }
});
await browser.close();
})();Use one geometry owner. If @page says A4 with 12 mm margins while the API supplies a different paper size or nonzero margins, the frame can move toward the edge or content can be pushed unexpectedly.
Control the page box, printable area, and frame position
Choose a paper size and orientation
The size descriptor in @page can be a named size such as A4, or an explicit size such as 210mm 297mm. For landscape output, use size: A4 landscape. Keep the API’s format or width/height consistent unless CSS is explicitly preferred.
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Understand what the margin means
CSS paged media defines a page box and a margin area around the page area. The 12 mm margin in the example reserves room between the content layout and the physical edge. The fixed frame uses inset: 0, so its stroke is placed at the edge of the page viewport while content remains inside the reserved margin. If your renderer clips fixed content at the page boundary, increase the reserved margin and test again.
Adjust stroke and color
Change 1px solid #222 to the required width, style, or color. A very thick stroke consumes more edge space; a light gray stroke is less intrusive on office printers. Keep box-sizing: border-box so the border is included inside the pseudo-element’s dimensions.
Keep content away from the frame
The frame does not create layout space because it is fixed and has pointer-events: none. The @page margin is what protects headings, tables, and images from touching it. Inspect all four edges, including pages containing unusually wide tables or full-bleed images.
Page breaks, tables, and long documents
Prevent awkward heading breaks
Rules such as break-after: avoid (or the older page-break-after: avoid) help keep a heading with the following paragraph. They do not guarantee that a very large element will fit on one page.
Handle tables deliberately
A table can split across pages. Use repeating table headers where your browser version supports them, and avoid placing a table inside a wrapper whose fixed height forces clipping. Check the first and last rows on every page; the frame itself should remain independent of the table’s flow.
Do not use a fixed-height “page” wrapper for flowing content
A wrapper with a screen-sized height and a normal border often clips or creates an extra blank page when content grows. Let the document flow naturally and reserve page geometry with @page.
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Backgrounds and transparency
Browser PDF generation may omit background colors and images unless printBackground: true is enabled. The border is a border stroke rather than a background fill, but enabling the option keeps the visual treatment consistent when the design also uses colored panels or a background image.
Diagnose a missing, clipped, or single-page border
- Border appears only once: confirm the rule is inside
@media printand that the frame pseudo-element isposition: fixed, notabsoluteor part of normal flow. - Border is absent in the PDF: verify the generated document includes the
pdf-page-framewrapper, then check that your selector is not overridden by a more specific print rule. Reload the page after changing CSS before generating again. - Border is clipped at the edge: remove default
htmlandbodymargins, keep the frame atinset: 0, and reserve a positive@pagemargin. If clipping persists, test a slightly larger margin and inspect the renderer’s page-box behavior. - Content touches or crosses the line: increase the
@pagemargin. Do not add arbitrary padding to every paragraph; that changes the document’s internal rhythm rather than the page geometry. - Colors or panels disappear: enable
printBackground: truein the PDF call and check whether the page is being rendered with print media. - Output size is wrong: decide whether CSS or the API owns paper size. With CSS ownership, use
preferCSSPageSize: trueand avoid conflicting API margins. With API ownership, remove or align the conflicting@pagedimensions. - Only the production server fails: compare the browser engine and version, loaded fonts, viewport, and wait condition with local generation. A late-loading font or image can change page breaks even when the border CSS is unchanged.
- Different pages behave differently: inspect pages containing long tables, replaced elements, floats, or explicit break rules. Fixed-frame painting is separate from flow pagination, but engine changes can affect both.
Make output reproducible in production
- Pin the Playwright or Puppeteer browser version used by your build or container.
- Wait for the document’s real readiness condition, such as network idle plus a specific application-loaded selector, before calling
pdf(). - Use deterministic fonts and load them before capture; fallback metrics can move a paragraph to the next page.
- Keep CSS and API paper-size settings in one documented place.
- Store representative PDFs in visual regression tests: a one-page document, a multi-page document, a table split, and content close to each edge.
- Open the resulting PDF with a viewer that shows page boundaries and zoom to 100% before changing the stroke width or margins.
Or skip the browser setup
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r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://example.com/report.html"}, timeout=90)
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://example.com/report.html' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);ScreenshotNeo includes 1,000 shots per month free with no card. Paid plans start at $5 for 3,000 shots; every feature is available on every plan, and yearly billing gives two months free. Create a free ScreenshotNeo account to try it.
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Will the frame work in every HTML-to-PDF engine?
No. The fixed pseudo-element pattern is intended for Chromium-based print rendering. Engines with different paged-media implementations can paint fixed elements differently, so validate the exact engine and version that produces your PDFs.
Can I put different text or a logo in the frame?
Yes. Add generated content or another fixed child inside the frame, but test overlap with page margins and confirm that the element repeats and remains legible on every page.
How can I make a border on only selected pages?
A single fixed frame naturally repeats on all pages. Selective pages require page-specific markup or engine features beyond this basic pattern; test the resulting page breaks rather than assuming a normal-flow class will map to physical pages.
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Why does a border look thicker in some PDF viewers?
Viewer zoom, device-pixel scaling, and anti-aliasing can change the on-screen appearance of a one-pixel stroke. Judge the printed or exported result at its intended scale and keep the CSS width explicit.
Frequently Asked Questions
Will the frame work in every HTML-to-PDF engine?
No. The fixed pseudo-element pattern is intended for Chromium-based print rendering. Engines with different paged-media implementations can paint fixed elements differently, so validate the exact engine and version that produces your PDFs.
Can I put different text or a logo in the frame?
Yes. Add generated content or another fixed child inside the frame, but test overlap with page margins and confirm that the element repeats and remains legible on every page.
How can I make a border on only selected pages?
A single fixed frame naturally repeats on all pages. Selective pages require page-specific markup or engine features beyond this basic pattern; test the resulting page breaks rather than assuming a normal-flow class will map to physical pages.
Why does a border look thicker in some PDF viewers?
Viewer zoom, device-pixel scaling, and anti-aliasing can change the on-screen appearance of a one-pixel stroke. Judge the printed or exported result at its intended scale and keep the CSS width explicit.
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