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Reserve the margin in PDF units and reset the image’s y-coordinate for every page. A split html2canvas result is one tall raster image; jsPDF will not repeat a top margin automatically. Compute contentHeight = pageHeight - topMargin - bottomMargin, place each section at y = topMargin, and call addPage() before placing each later section.
Why later pages lose the top margin
html2canvas returns a single canvas whose height may be many printed pages. When that canvas is inserted into jsPDF, the image has no knowledge of page boundaries, headers, footers, or margins. The PDF code controls the placement coordinate. If the first image starts at top but subsequent iterations use 0, those pages correctly begin at the PDF’s top edge—just not at your intended margin.
The fix is a pagination loop with three separate measurements:
- Page dimensions: the width and height returned by jsPDF, in its configured unit.
- Margins: top, right, bottom, and left, in that same unit.
- Rendered image dimensions: the canvas scaled to the available content width.
Do not subtract CSS pixels from millimetres or points. Convert the canvas proportionally into the jsPDF unit first, then calculate how much of that rendered height fits on each page.
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Manual pagination with a repeated top margin
Complete working example
This example captures an element, scales it to an A4 page, leaves 12 mm above and below the content, and repeats that top margin on every page.
html2canvas(element, {
scrollX: 0,
scrollY: 0,
useCORS: true
}).then((canvas) => {
const pdf = new jsPDF({
unit: 'mm',
format: 'a4',
orientation: 'portrait'
});
const top = 12;
const right = 10;
const bottom = 12;
const left = 10;
const pageWidth = pdf.internal.pageSize.getWidth();
const pageHeight = pdf.internal.pageSize.getHeight();
const contentWidth = pageWidth - left - right;
const contentHeight = pageHeight - top - bottom;
// Preserve the canvas aspect ratio in PDF units.
const renderedHeight = canvas.height * contentWidth / canvas.width;
const imageData = canvas.toDataURL('image/png');
let remainingRenderedHeight = renderedHeight;
let offset = 0;
while (remainingRenderedHeight > 0) {
if (offset > 0) {
pdf.addPage();
}
const sliceHeight = Math.min(contentHeight, remainingRenderedHeight);
// The image is taller than the page. A negative y offset exposes
// the current section, while the page itself clips the rest.
pdf.addImage(
imageData,
'PNG',
left,
top - offset,
contentWidth,
renderedHeight
);
remainingRenderedHeight -= sliceHeight;
offset += sliceHeight;
}
pdf.save('output.pdf');
});The key detail is that top is used on every addImage() call. The progressively more negative top - offset value moves the tall image upward to reveal the next section, but each new PDF page still starts that section at the same top margin.
How the height calculation works
- Read the page size after creating the document. This avoids hard-coding a value that could be wrong for A4, Letter, landscape, or a custom format.
- Subtract left and right margins from the page width.
- Scale the canvas to that content width. The proportional height is
canvas.height * contentWidth / canvas.width. - Subtract both top and bottom margins from the page height. That result is the drawable height for each slice.
- After each slice, increase the offset by the drawable height actually consumed. Add a page only when there is still image content to place.
With a 297 mm-high A4 page and 12 mm top and bottom margins, the drawable height is 273 mm. A final slice can be shorter than 273 mm; it still begins at 12 mm and never enters the reserved footer area.
A more deterministic option: create real canvas slices
The negative-offset technique relies on the PDF page clipping region. It is compact and usually sufficient, but explicit raster slices give you tighter control for very large captures, unusual viewers, or debugging page boundaries.
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const pdf = new jsPDF({ unit: 'mm', format: 'a4' });
const top = 12, right = 10, bottom = 12, left = 10;
const pageWidth = pdf.internal.pageSize.getWidth();
const pageHeight = pdf.internal.pageSize.getHeight();
const contentWidth = pageWidth - left - right;
const contentHeight = pageHeight - top - bottom;
const scale = contentWidth / source.width;
const pagePixels = Math.floor(contentHeight / scale);
let sourceY = 0;
let pageNumber = 0;
while (sourceY < source.height) {
if (pageNumber > 0) pdf.addPage();
const slicePixels = Math.min(pagePixels, source.height - sourceY);
const slice = document.createElement('canvas');
slice.width = source.width;
slice.height = slicePixels;
const context = slice.getContext('2d');
context.drawImage(
source,
0, sourceY, source.width, slicePixels,
0, 0, source.width, slicePixels
);
const sliceHeight = slicePixels * scale;
pdf.addImage(
slice.toDataURL('image/png'),
'PNG',
left,
top,
contentWidth,
sliceHeight
);
sourceY += slicePixels;
pageNumber += 1;
}
pdf.save('output.pdf');
});This version copies only the current source range and inserts it at exactly (left, top). It can reduce the amount of oversized image data held by a PDF page, although the original html2canvas canvas still exists in memory. For extremely tall documents, capture and process sections separately instead of creating one enormous canvas.
Using html2pdf.js instead of a manual loop
If you do not need custom raster pagination, html2pdf.js exposes a margin option and page-break controls. The margin accepts:
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- A single number for all four sides.
[vertical, horizontal]for top/bottom and left/right.[top, left, bottom, right]for independent sides.
For example, use margin: [12, 10, 12, 10] when your jsPDF unit is millimetres. Keep the unit consistent in the html2pdf.js configuration and any calculations you make yourself. If you also use the jsPDF html() integration, pass the html2canvas options through its HTML-rendering pipeline and verify the resulting page breaks rather than assuming a tall screenshot will split at semantic HTML boundaries.
When the wrapper is preferable
- Use html2pdf.js when convenience, CSS page-break rules, and a four-value margin setting matter more than exact raster slice placement.
- Use the manual loop when you need predictable image coordinates, custom headers or footers, or a known number of pixels per page.
- Use explicit canvas slices when clipping behavior differs between PDF viewers or when boundary artifacts must be eliminated.
Headers, footers, and page-specific content
A repeated top margin is empty space, not a header. To draw a header, add it after creating each page and before (or after) inserting the image, using the same top value as the reserved area. Increase top to include the header’s height plus its desired gap. For a footer, reserve bottom and draw the footer inside that area after the image is placed. Never let the image’s calculated height use the full page height when a footer is required.
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Capture settings that affect pagination
Scrolling and fixed elements
html2canvas uses browser window and document APIs. Set scrollX: 0 and scrollY: 0 when you want the document’s top-left coordinate rather than the user’s current scroll position. Fixed navigation bars can appear on every captured section; hide or reposition them in a cloned document before capture if they should not repeat.
Cross-origin images
Images hosted on another origin need appropriate CORS permission. useCORS: true asks html2canvas to request them with CORS, but the remote server must send an allowing header. Otherwise the canvas can be tainted, and toDataURL() may fail or produce an incomplete capture. Proxy inaccessible assets or replace them with same-origin copies.
Lazy-loaded content and fonts
Wait until lazy images have loaded and web fonts have settled before calling html2canvas. Otherwise the captured height changes after you calculated page slices, causing missing content or unexpected blank space. A practical check is to await relevant image promises and document.fonts.ready, then measure the element again immediately before capture.
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Canvas size and memory
A high device scale factor and a long page multiply pixel count. Reduce the capture scale when memory is limited, process sections separately, or use the explicit-slice pattern. A PDF can still be large when every page contains a PNG; JPEG may reduce size for photographic content at the cost of text and line-art quality.
Troubleshooting common failures
Only the first page has a margin
Cause: later calls use y = 0, or a wrapper’s margin is configured for only the first page.
Fix: use top for every page and subtract both margins from contentHeight. In the negative-offset loop, keep the expression top - offset; in the explicit-slice loop, use top directly.
Content overlaps the footer
Cause: the loop uses pageHeight - top and forgets the bottom margin.
Fix: calculate pageHeight - top - bottom. The final slice is allowed to be shorter; do not stretch it to fill reserved footer space.
A blank page appears at the end
Cause: addPage() runs before checking whether another slice remains, or the loop treats an exact boundary as an additional page.
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Fix: add a page only when the offset or page number is greater than zero and the remaining height is positive. In a wrapper, inspect page-break settings for an empty trailing break element.
Pages are the wrong size or orientation
Cause: hard-coded dimensions do not match the configured format, orientation, or unit.
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Fix: call pdf.internal.pageSize.getWidth() and getHeight() after constructing jsPDF, and derive every measurement from those values.
Images disappear or toDataURL() throws
Cause: a cross-origin image tainted the canvas.
Fix: enable useCORS, ensure the image server permits your origin, or serve the asset through a same-origin proxy. Also check the browser console for the first blocked resource.
Text looks blurry
Cause: the entire page is rasterized by html2canvas, then scaled down.
Fix: increase capture scale only if memory permits, keep the rendered width close to the PDF content width, or use a vector-oriented HTML/PDF workflow when selectable text is essential.
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Or skip the browser setup
If your actual goal is a clean PDF or image of a URL rather than reproducing a browser capture pipeline, ScreenshotNeo makes one GET request and returns a PNG, JPEG, WebP, or PDF. It accepts cookie and consent banners like a visitor, then removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture. Bot checks, CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and the response identifies the result with X-Page-Verdict and X-Billed headers.
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 the request options. The same API supports full-page capture, element selectors, device and viewport settings, retina scale, PDF paper and margin controls, custom CSS and JavaScript, click and wait actions, blocked resources, headers, cookies, user agents, timezone and geolocation, transparent backgrounds, resizing, TTL-based caching, signed links, asynchronous webhooks, bulk capture of up to 100 URLs per call, usage reporting, and an OpenAPI specification. An MCP server provides take_screenshot, get_page_info, and capture_pdf tools for Claude, Cursor, and other MCP clients.
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Final implementation checklist
- Configure jsPDF’s unit before calculating margins.
- Read page width and height from the document instance.
- Subtract left and right margins from image width.
- Subtract both top and bottom margins from usable page height.
- Set the image’s x-coordinate to
leftand its y-coordinate totopon every page. - Add a page only when another positive-height slice remains.
- Test the first, middle, and final pages, including an image whose height is an exact multiple of usable page height.
- Verify CORS, scrolling, lazy content, fonts, and memory limits before blaming pagination.
Frequently Asked Questions
Can I use pixel values for the margin?
Only after converting them to the jsPDF document unit. A CSS-pixel value cannot be subtracted directly from a page height expressed in millimetres or points.
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The page clipping region hides the portion outside the page. If you need deterministic cropping independent of clipping behavior, create a temporary canvas slice and insert it at the positive top coordinate.
Why is html2pdf.js margin syntax different from CSS margin syntax?
Its margin array is interpreted in jsPDF units and uses the order top, left, bottom, right for four values, not CSS’s unit and layout rules.
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