Short answer: “Full screen” in a jsPDF workflow can mean three different things: fitting the PDF page in a viewer, choosing a page geometry that suits the document, or scaling the HTML before it is rasterized. Use the control that matches the problem. Create the PDF with the required format and orientation, set doc.setDisplayMode('fullpage') when you want a compatible viewer to open the page fitted to its available area, and separately coordinate the HTML width, windowWidth, canvas dimensions, and scale.
A display mode is only a reader preference. jsPDF’s API documentation notes that only certain PDF readers support it, including Adobe Acrobat. It cannot repair content that was rendered too large, too small, clipped, or badly paginated.
What “full screen” means in jsPDF
Before changing code, identify which of these outcomes you need:
| Goal | Correct control | What it changes |
|---|---|---|
| Open the PDF fitted to the reader window | setDisplayMode('fullpage') |
A viewer opening hint; support varies by reader |
| Make the document itself wider, taller, portrait, landscape, or custom-sized | new jsPDF({ format, orientation, unit }) |
Physical PDF page geometry |
| Fit responsive HTML into the PDF without unexpected zoom | HTML/container width, windowWidth, canvas dimensions, and scale |
The pixels and layout rendered into the PDF |
| Keep a long page readable | Margins, page-break rules, and auto-paging options | How content is divided across PDF pages |
These layers are independent. A smaller phone does not automatically require a smaller PDF page, and a viewer zoom setting does not change the HTML that jsPDF already captured.
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Set the PDF page and its initial display mode
Choose the page for the document’s purpose first. A report intended for printing may use A4 or Letter; a wide dashboard may need landscape orientation; a screen-only artifact may use a custom size. Then set the display hint:
import { jsPDF } from 'jspdf';
const doc = new jsPDF({
orientation: 'portrait',
unit: 'mm',
format: 'a4'
});
// Add text, images, or render HTML here.
doc.text('Example document', 20, 25);
doc.setDisplayMode('fullpage');
doc.save('document.pdf');The API accepts zoom values such as 'fullpage', 'fullwidth', 'fullheight', 'original', percentage strings, and numeric scales. Use 'fullpage' when the intent is to fit the complete page area, not when you need to alter the page’s dimensions.
Reader compatibility
The display preference is embedded in the PDF, but the application opening the file decides whether to honor it. Adobe Acrobat is an example of a reader that supports these settings; browser PDF viewers and mobile viewers may ignore them or apply their own zoom policy. Always inspect the file in the readers your users actually use.
When a custom page is better
If a phone-oriented document is being clipped because the page is physically too narrow or too wide, use a custom format rather than relying on zoom:
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const doc = new jsPDF({
orientation: 'portrait',
unit: 'px',
format: [390, 844]
});
doc.setDisplayMode('fullpage');Custom dimensions describe the PDF page. They do not make a desktop HTML layout responsive; that requires controlling the source layout and rendering options as well.
Render HTML at an intentional width
When using doc.html(), decide which CSS viewport the page should emulate. A common source of “too large on a small screen” output is mixing a narrow target page with a desktop windowWidth, or setting a width that does not match the content container.
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const element = document.querySelector('#invoice');
const doc = new jsPDF({
orientation: 'portrait',
unit: 'mm',
format: 'a4'
});
doc.html(element, {
// Match the layout width you want CSS media queries to see.
windowWidth: 780,
// Keep content inside the printable page width.
margin: [12, 12, 12, 12],
autoPaging: true,
html2canvas: {
// Set this deliberately; see the resolution section below.
scale: 1
},
callback: (pdf) => {
pdf.setDisplayMode('fullpage');
pdf.save('invoice.pdf');
}
});In the HTML module implementation, when both the target width and windowWidth are numeric, the rendering scale is calculated as width / windowWidth; otherwise the scale is 1. This is a content-rendering calculation, not a viewer zoom instruction. Keep the source container width and windowWidth coherent, then adjust page margins and format.
Use a dedicated capture container
Do not capture a page whose width is being continuously changed by phone breakpoints while the capture is running. Give the printable content a deliberate width and styles:
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<div id="pdf-content" class="pdf-layout">...</div>
<style>
.pdf-layout {
width: 780px;
background: #fff;
color: #111;
}
.pdf-layout img {
max-width: 100%;
height: auto;
}
.pdf-layout .avoid-break {
break-inside: avoid;
page-break-inside: avoid;
}
</style>The width should reflect the layout you want exported, not necessarily the physical width of the user’s phone. If you need a genuinely narrow, phone-like PDF, create a narrow capture layout and select a matching page format.
Control pixels, canvas size, and resolution
Canvas width and height are pixel dimensions. If they are omitted, the canvas uses the window dimension. The documented scale option defaults to the browser’s device-pixel ratio, so a high-density phone can produce a larger bitmap than a desktop at the same CSS size.
const doc = new jsPDF({ format: 'a4', unit: 'mm' });
const node = document.querySelector('#pdf-content');
doc.html(node, {
width: 180,
windowWidth: 780,
html2canvas: {
width: 780,
height: node.scrollHeight,
scale: 1.5,
useCORS: true
},
callback: (pdf) => {
pdf.setDisplayMode('fullpage');
pdf.save('scaled.pdf');
}
});Increase scale only when text or images need more raster resolution. Higher values consume more memory and can make long documents slower or exceed browser canvas limits. If output is already sharp, changing viewer zoom or doubling scale will not fix a layout-width error.
Choosing a practical scale
- Start with the default device-pixel-ratio behavior or an explicit value of
1for predictable memory use. - Raise it modestly for fine text or line art, then inspect file size and rendering time.
- Use CSS dimensions for layout and pixel dimensions for raster quality; do not substitute one for the other.
Handle long pages and automatic pagination
Long HTML has a separate problem: page breaks. The HTML module’s implementation derives windowHeight from the container’s client, scroll, or offset height, and automatic paging is enabled by default. That default is useful, but it does not guarantee ideal breaks for every layout.
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- Give the capture container a stable width and let its height include all loaded content.
- Wait until fonts, images, and lazy content have finished loading.
- Mark cards, table rows, or headings that should not split with
break-inside: avoidandpage-break-inside: avoid. - Set realistic margins so the usable page width matches your layout.
- Open the result in more than one target reader and check the first, middle, and last pages.
doc.html(node, {
margin: [10, 10, 10, 10],
autoPaging: true,
pagebreak: {
mode: ['css', 'legacy']
},
callback: (pdf) => pdf.save('long-document.pdf')
});Pagination can differ when elements depend on viewport media queries, web fonts, asynchronous images, or transformed CSS. Treat the implementation defaults as starting points and validate the actual document.
Complete browser example for a smaller-screen layout
import { jsPDF } from 'jspdf';
async function exportPdf() {
const node = document.querySelector('#pdf-content');
if (!node) throw new Error('Missing #pdf-content');
// Ensure images and fonts used by the node are ready in your app.
const doc = new jsPDF({
orientation: 'portrait',
unit: 'mm',
format: 'a4',
compress: true
});
await doc.html(node, {
width: 180,
windowWidth: 780,
margin: [10, 10, 10, 10],
autoPaging: true,
html2canvas: {
scale: 1,
backgroundColor: '#ffffff',
useCORS: true
},
callback: (pdf) => {
pdf.setDisplayMode('fullpage');
pdf.save('small-screen-friendly.pdf');
}
});
}
exportPdf().catch(console.error);The exact option surface can vary between installed jsPDF releases. Pin and test the version used by your application rather than assuming behavior is identical across every release.
Common failures and fixes
The PDF opens zoomed out or zoomed in
Cause: the reader ignored or overrode the display preference. Fix: keep setDisplayMode('fullpage'), but treat it as optional UI guidance. Also check the reader’s own zoom setting.
Content is clipped on the right
Cause: the HTML width exceeds the usable PDF width, or a child has a fixed desktop width. Fix: reduce the capture width, increase page size or use landscape, and remove fixed-width children that overflow.
Everything is tiny
Cause: a large windowWidth is being squeezed into a narrow target width, or scale was reduced unnecessarily. Fix: align windowWidth with the intended CSS layout and inspect the calculated width-to-window ratio.
Text is blurry
Cause: insufficient canvas pixels or excessive downscaling. Fix: increase html2canvas.scale moderately, ensure images are large enough, and watch memory use.
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Cause: capture started before asynchronous resources loaded, or cross-origin images were not usable by the canvas. Fix: await image/font readiness, configure permitted CORS responses, and avoid starting capture while content is still changing.
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Cause: CSS break rules cannot always be honored, especially around complex flex, grid, transforms, and very tall elements. Fix: simplify the print layout, add break-avoid rules to smaller blocks, and inspect each page rather than relying on one browser preview.
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Cause: a very tall canvas and a high scale consume substantial memory. Fix: lower scale, split the document into logical sections, reduce oversized images, or generate separate pages instead of one enormous raster surface.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Performance, reliability, and validation checklist
- Use a stable, dedicated export container.
- Wait for fonts, images, lazy sections, and charts.
- Keep
windowWidth, container width, page format, and margins intentional. - Choose scale for the required resolution, not as a generic “quality” maximum.
- Test portrait and landscape decisions on the smallest supported screen.
- Open the file in the browser viewer and at least one dedicated PDF reader.
- Check page count, clipping, table breaks, hyperlinks, selectable text, and file size.
- Pin jsPDF and its HTML-rendering dependencies, then retest after upgrades.
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One-call cURL example
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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)
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
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FAQ
Does fullpage make a PDF physically larger?
No. It requests an initial viewer fit. Page dimensions remain those selected when creating the jsPDF instance.
Should I use a phone’s CSS width for every export?
No. Use the width that matches the document’s intended layout. A phone-sized source is appropriate only when the PDF itself should preserve that narrow design.
Can jsPDF force every PDF reader into full-page view?
No. Readers may ignore display preferences and apply their own zoom behavior.
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No. It can improve raster detail while increasing memory use, processing time, and output size. Choose the lowest value that meets your readability requirement.
Frequently Asked Questions
Does fullpage make a PDF physically larger?
No. It requests an initial viewer fit. Page dimensions remain those selected when creating the jsPDF instance.
Should I use a phone’s CSS width for every export?
No. Use the width that matches the document’s intended layout. A phone-sized source is appropriate only when the PDF itself should preserve that narrow design.
Can jsPDF force every PDF reader into full-page view?
No. Readers may ignore display preferences and apply their own zoom behavior.
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Is a higher canvas scale always better?
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