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To split a tall image across two PDF pages with jsPDF, crop it into two adjacent pieces and place one piece on each page with addImage. jsPDF’s documented image API places an image at explicit coordinates and dimensions; it does not document an automatic split option. The method below preserves scale and continuity by deriving both crops from the same source image.
Why you need to crop the image yourself
addImage takes image data plus an explicit placement rectangle: an x-coordinate, y-coordinate, width, and height in the PDF document’s configured units. Its documented API does not list a setting that automatically divides an oversized image between pages. The reliable approach is to crop the source into page-sized image segments, then add each segment to its own page. See the jsPDF type declarations for the relevant API signatures.
This technique is appropriate when the image itself is the content you want in the PDF. The crops remain raster images; text or graphics flattened into the source will not become selectable PDF text.
Set up the page and calculate the crop
Choose the PDF page format, orientation, unit, and margins before calculating crop dimensions. jsPDF supports standard page formats and custom page dimensions, as described in its constructor documentation. The code below uses A4 portrait pages, millimeters, and 10 mm margins. Change those values to match your layout.
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The drawing canvas has pixel dimensions, while addImage uses the PDF unit you selected. To preserve the image’s aspect ratio, first choose a display width. Then calculate the displayed height from the canvas aspect ratio. The maximum displayed height per page is the page height minus the top and bottom margins.
Convert that available display height back to source pixels to find where the first crop ends. The second crop starts at exactly that source-pixel row. Both pieces use the same display width, which avoids a size jump or gap at the page break.
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Complete browser example
This example assumes an image is available at imageUrl and that jsPDF is loaded in the page. It draws the image onto a source canvas, creates two crops, and places them on consecutive pages. The first page receives as much of the image as fits in the content area; the second receives the remaining rows.
// Load jsPDF in the page, for example with a script tag that exposes window.jspdf.jsPDF.
const { jsPDF } = window.jspdf;
function loadImage(url) {
return new Promise((resolve, reject) => {
const img = new Image();
img.onload = () => resolve(img);
img.onerror = () => reject(new Error(`Could not load image: ${url}`));
img.src = url;
});
}
async function splitImageAcrossTwoPages(imageUrl) {
const img = await loadImage(imageUrl);
// Render the source at its natural pixel dimensions.
const source = document.createElement('canvas');
source.width = img.naturalWidth;
source.height = img.naturalHeight;
const sourceCtx = source.getContext('2d');
if (!sourceCtx) throw new Error('Could not create a 2D canvas context');
sourceCtx.drawImage(img, 0, 0);
const pdf = new jsPDF({
orientation: 'portrait',
unit: 'mm',
format: 'a4'
});
const margin = 10;
const pageWidth = pdf.internal.pageSize.getWidth();
const pageHeight = pdf.internal.pageSize.getHeight();
const contentWidth = pageWidth - margin * 2;
const contentHeight = pageHeight - margin * 2;
// Fit the image to the available width, retaining its aspect ratio.
const displayWidth = contentWidth;
const pixelsPerUnit = source.width / displayWidth;
const firstCropPixelHeight = Math.min(
source.height,
Math.floor(contentHeight * pixelsPerUnit)
);
if (firstCropPixelHeight <= 0) {
throw new Error('The page content area is too small for this image');
}
function makeCrop(startY, cropHeight) {
const canvas = document.createElement('canvas');
canvas.width = source.width;
canvas.height = cropHeight;
const ctx = canvas.getContext('2d');
if (!ctx) throw new Error('Could not create a crop canvas context');
// drawImage source-rectangle form: crop exactly the requested source rows.
ctx.drawImage(
source,
0, startY, source.width, cropHeight,
0, 0, canvas.width, canvas.height
);
return canvas;
}
const firstCrop = makeCrop(0, firstCropPixelHeight);
const firstDisplayHeight = firstCropPixelHeight / pixelsPerUnit;
pdf.addImage(
firstCrop,
'PNG',
margin,
margin,
displayWidth,
firstDisplayHeight
);
const remainingPixelHeight = source.height - firstCropPixelHeight;
if (remainingPixelHeight > 0) {
const secondCrop = makeCrop(firstCropPixelHeight, remainingPixelHeight);
const secondDisplayHeight = remainingPixelHeight / pixelsPerUnit;
pdf.addPage('a4', 'portrait');
pdf.addImage(
secondCrop,
'PNG',
margin,
margin,
displayWidth,
secondDisplayHeight
);
}
pdf.save('split-image.pdf');
}
splitImageAcrossTwoPages('/images/tall-image.png').catch(console.error);The cropping step uses the canvas 2D drawImage overload with source and destination rectangles; the jsPDF declarations include that overload as well as addPage and page-size accessors. See the declarations for those interfaces.
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When the image is shorter or longer than two pages
If the image fits within the first page’s content height, the code creates only one page. If the remainder is taller than one page, this two-page example is not enough: repeat the crop-and-add process in a loop, taking at most Math.floor(contentHeight * pixelsPerUnit) source rows per page until all source rows are used. Add each new page before placing its crop.
Adapting the layout
- Landscape or another paper size: change the constructor’s orientation or format before reading page dimensions.
- Custom dimensions: supply the desired page dimensions when constructing the PDF, then use
getWidth()andgetHeight()rather than hard-coded page values. - Different margins: update
margin; the crop calculation uses the available height after top and bottom margins. - Different display width: choose a width no larger than
pageWidth - 2 * margin. The crop pixel height is recalculated from that width, preserving the source aspect ratio. - More or less image clarity: retain sufficient source pixels for the intended printed or on-screen size. Enlarging a low-resolution source cannot restore detail.
Important edge cases
Images loaded from another origin
A browser may refuse to draw a cross-origin image into a canvas unless the image host permits it through CORS. If the canvas becomes tainted, exporting or using its pixel data can fail. Serve the image from your own origin or configure the remote host’s CORS response appropriately; setting img.crossOrigin alone does not grant permission.
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Transparent images and output format
PNG retains transparency, while formats such as JPEG do not. If you use JPEG crops, put an appropriate background behind the image before exporting or expect transparency to be flattened. The sample passes canvas data to addImage as PNG.
Very large source images
Canvas buffers and crop canvases can consume substantial memory, particularly if the whole image and several crops coexist. The API references do not establish quantitative memory limits or performance benchmarks. For unusually large images, process one crop at a time, release canvases when finished, and test with the actual image sizes and browsers your application supports.
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Page seam and rounding
The first crop height is rounded down to a whole source pixel. The next crop begins at that exact row, so source content is neither skipped nor duplicated. Inspect the generated PDF in the browser and PDF viewer relevant to your application to confirm the seam and image clarity.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting
- The image is clipped or extends beyond the page: confirm margins, page format, orientation, and units are set before calculating dimensions. Use the measured page size and subtract both margins.
- The second page is blank: check that the source image is taller than the first crop and that the remainder height is positive. Verify the page was added before the second
addImagecall. - The second crop repeats or skips part of the picture: its source start row must be exactly
firstCropPixelHeight, with no extra offset or overlap. - The image changes size at the break: use one
pixelsPerUnitvalue and the same display width for both crops. Do not independently fit each crop to the page. - Canvas export fails: investigate cross-origin restrictions and CORS headers, or test with a same-origin image.
- The PDF is huge or the browser runs out of memory: reduce source dimensions if the required output resolution permits it, and avoid keeping unnecessary full-size crop canvases alive.
- Text in the image is not selectable: that is expected because this workflow places raster crops. For selectable text or vector output, build the page content directly instead of flattening it into one image.
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When not to use this method
Use crop-per-page when you have a raster image that must continue across a page break. If your source is HTML or text and you need selectable text, sharp vector elements, or document-style flow, generate the PDF from that content instead of first turning the entire page into one image. jsPDF’s declarations include HTML options such as autoPaging, but that does not establish automatic pagination for arbitrary image data passed to addImage.
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Does jsPDF automatically split an image that is taller than a page?
The documented addImage API specifies placement coordinates and dimensions, not an automatic image-splitting parameter.
Can I split a tall image across more than two PDF pages?
Yes. Repeatedly crop at the maximum source-pixel height that fits the page content area, add a page for each crop, and continue until no source rows remain.
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