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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteTo put one rendered HTML region on a single PDF page whose height grows with the content, capture the region with html2canvas, choose a PDF width, derive the height from the canvas aspect ratio, and pass both dimensions as jsPDF’s custom format array. Keep the units straight: the canvas is measured in pixels, while jsPDF uses the unit you configure, such as millimeters or points.
The core calculation
html2canvas returns a bitmap with canvas.width and canvas.height in pixels. jsPDF does not interpret those numbers as millimeters or points. Instead, select a PDF width in your chosen jsPDF unit and calculate a proportional height:
pdfHeight = pdfWidth × (canvas.height ÷ canvas.width)
For example, if the canvas is 1,200 pixels wide and 2,400 pixels tall, a 210 mm PDF width produces a 420 mm page height. The image keeps its aspect ratio and fills one custom page.
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Complete browser-side implementation
Load html2canvas and jsPDF in a browser page, then capture the element after its fonts, images and dynamic content are ready. This example creates a portrait PDF in millimeters and saves it locally.
async function exportElementToPdf() {
const element = document.querySelector("#content");
if (!element) throw new Error("Content element was not found");
// Include the complete scrollable region, not only its visible box.
const canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight,
scale: 1
});
if (!canvas.width || !canvas.height) {
throw new Error("The captured canvas has no dimensions");
}
// These values are millimeters because the jsPDF unit is "mm".
const pageWidth = 210;
const pageHeight = pageWidth * (canvas.height / canvas.width);
const { jsPDF } = window.jspdf;
const pdf = new jsPDF({
orientation: "portrait",
unit: "mm",
format: [pageWidth, pageHeight]
});
const image = canvas.toDataURL("image/png");
pdf.addImage(image, "PNG", 0, 0, pageWidth, pageHeight);
pdf.save("content.pdf");
}The numeric array in format is [width, height] in the configured unit. The scale: 1 setting makes the relationship between canvas pixels and the source layout easier to inspect; it does not make one pixel equal one millimeter. A higher scale can improve detail but increases memory use and the chance of hitting browser canvas limits.
Waiting for content before capture
Run the function only after asynchronous content has settled. Wait for a specific application state, call it after a data fetch completes, and ensure web fonts and important images have loaded. If the page changes after capture starts, the resulting bitmap can be incomplete even though the PDF code is correct.
Adding margins
Margins must be included in the page geometry. Reserve the desired left and right margins, compute the image height from the remaining width, and add the top and bottom margins to the page height:
const margin = 10; // mm on every side
const pageWidth = 210;
const imageWidth = pageWidth - (margin * 2);
const imageHeight = imageWidth * (canvas.height / canvas.width);
const pageHeight = imageHeight + (margin * 2);
const pdf = new jsPDF({
orientation: "portrait",
unit: "mm",
format: [pageWidth, pageHeight]
});
pdf.addImage(canvas.toDataURL("image/png"), "PNG",
margin, margin, imageWidth, imageHeight);
If you want a different paper width, change pageWidth; the derived height follows automatically. Use points or inches instead of millimeters only if you express every page and placement value in that same unit.
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Choosing a one-page canvas versus normal pagination
A custom-height page is useful for receipts, reports, invoices, embeds and continuous web content where one uninterrupted sheet is desirable. It is still a raster image, however, so text can become difficult to read when a very long page is viewed or printed at a reduced scale.
| Requirement | Custom-height image page | Paginated PDF |
|---|---|---|
| Continuous single-sheet output | Strong fit; height follows the captured ratio. | Requires deliberate page-break design. |
| Selectable or searchable text | Not provided by the bitmap alone. | Prefer an HTML/text rendering path or generated document content. |
| Very long content | Canvas dimension and pixel-area limits become a risk. | Safer because content is split across normal pages. |
| Predictable breaks and print readability | Breaks are not created automatically. | Better control over page breaks and margins. |
For a long document, capture separate sections or use jsPDF’s HTML rendering and page-break controls rather than forcing everything into one enormous bitmap. Test the output at the size your readers will actually view or print.
Preventing clipped content
Use the element’s scroll dimensions
Clipping usually occurs because the capture viewport is the element’s visible height rather than its full layout height. Passing element.scrollWidth and element.scrollHeight as windowWidth and windowHeight gives html2canvas the dimensions of the complete scrollable region. For nested scrolling containers, temporarily remove the inner overflow restriction or capture a wrapper whose layout includes all content.
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Make hidden and lazy content explicit
Expand accordions, render virtualized rows, and load lazy images before calling html2canvas. A browser screenshot library cannot capture DOM nodes that your application has not rendered. Freeze animations where possible so an element does not move between layout measurement and rasterization.
Canvas limits and long pages
Browser limits vary by engine, operating system and device. The html2canvas FAQ gives rough evergreen-browser guidance of about 32,767 pixels for a maximum dimension in Chrome/Chromium and Firefox, with approximate maximum areas of 268 million pixels for Chrome/Chromium and 472 million pixels for Firefox. Safari desktop is described as similar to Chrome, while iOS limits are lower and device-dependent. These are not guarantees.
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A tall canvas can therefore fail silently, produce a blank bitmap or contain only part of the page. Estimate the resulting pixel width and height before capture, and treat a very large area as a reason to paginate or capture sections. Lowering scale reduces pixel dimensions, but also reduces detail.
Images, cross-origin content and CSS
Images hosted on another origin
The browser’s same-origin policy applies to images. Set useCORS: true only when the image server sends suitable CORS headers:
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchconst canvas = await html2canvas(element, {
windowWidth: element.scrollWidth,
windowHeight: element.scrollHeight,
useCORS: true,
scale: 1
});If the server cannot grant CORS access, use a server-side proxy that you control, or replace the asset with a same-origin version. Do not assume that adding useCORS can bypass a server’s policy.
CSS differences
html2canvas re-creates the page from DOM and computed styles; it does not reproduce every CSS property or browser painting behavior. Filters, complex blend modes, unusual backgrounds, pseudo-elements and advanced layout details may differ. Create a print-specific wrapper or stylesheet when exact output matters, and validate the actual styles used by your site.
Node.js and server-side generation
html2canvas depends on window, document and computed browser styles, so it is a client-side library. It is not a drop-in Node.js renderer. For server-side screenshots, use browser automation such as Puppeteer or Playwright, then build a PDF from the captured result or use the browser’s PDF support. That approach requires managing a browser process, fonts, navigation waits, authentication and resource failures.
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Troubleshooting
The bottom of the element is cut off
- Cause: The capture used the visible viewport dimensions.
- Fix: Pass
scrollWidthandscrollHeight, remove restrictive overflow on the capture wrapper, and ensure all dynamic sections are rendered.
The PDF is blank or only partly rendered
- Cause: The canvas exceeded a browser dimension or total-area limit, or capture ran before content loaded.
- Fix: Reduce
scale, split the document into sections, wait for fonts and images, or switch to paginated output.
Images disappear
- Cause: Cross-origin images lack permission for canvas use.
- Fix: Configure the image host’s CORS headers and use
useCORS: true, proxy the assets, or serve them from the same origin.
The PDF styling does not match the page
- Cause: html2canvas has incomplete CSS support and rasterizes the result.
- Fix: Simplify or override the print layout, test the specific CSS features in your target browsers, and use a text-oriented or browser PDF path when fidelity and selectable text are more important than a single image page.
The page is unreadably long
- Cause: A single bitmap page is being reduced to fit a viewer or printer.
- Fix: Use normal pages, choose a wider page format where appropriate, or capture logical sections separately.
Performance, reliability and file size
- Memory: Canvas memory grows with width, height and scale. Large pages can stall the tab or fail before jsPDF runs.
- Speed: More DOM nodes, high-resolution images, web fonts and expensive CSS increase rasterization time. Capture only the required region.
- Output size: PNG preserves sharp text but can be large. JPEG can reduce size for photographic content, at the cost of compression artifacts; choose the format that suits the document.
- Repeatability: Fix the viewport, wait conditions, timezone-dependent data and animations when generating comparable PDFs.
- Security: Treat custom URLs, HTML and scripts as untrusted input in any server-side workflow. Restrict navigation and resource access in browser automation.
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FAQ
Can I use pixels directly as jsPDF dimensions?
Only if you deliberately configure a pixel-based unit supported by your jsPDF version. In the common millimeter or point setup, convert by preserving the canvas aspect ratio and choosing page dimensions in the configured unit.
Will a custom-height PDF remain accessible?
No. The example places one raster image on the page, so it does not preserve the DOM’s text structure, semantics or selectable text.
Should I use PNG or JPEG?
PNG is usually safer for text, lines and flat UI colors. JPEG is often smaller for photographic pages but may blur fine text or introduce artifacts.
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Can I use pixels directly as jsPDF dimensions?
Only with a deliberately pixel-based jsPDF unit. Otherwise choose dimensions in millimeters, points or another configured unit and preserve the canvas aspect ratio.
Will a custom-height PDF remain accessible?
Not when it is created as one raster image; the DOM’s text structure and semantics are not retained.
Should I use PNG or JPEG?
PNG generally preserves text and interface details; JPEG can be smaller for photographic content but may blur fine text.
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