A web page as a PDF: A4 pages or one long page?
Should a web page become A4 pages or one long PDF page?
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Short answer
Choose A4 (or US Letter) when the PDF will be printed or read page by page; choose one long page when it should look exactly like the site on screen, with nothing cut in half. In both cases pick the screen the page was designed for — desktop for most sites — and hide the cookie banners first.
First, which screen?
A modern site has no single layout. It rearranges itself for the width of the window: three columns on a desktop, one column on a phone, the menu folded into a button. A converter has to pick one of those widths before it can draw anything, and that choice changes the PDF more than any other.
Desktop is what most people mean by "the page" — the layout you see on a laptop, with every column in place. Tablet and Phone give the narrower layouts, which are worth choosing for an article you will read on a phone, because the text comes out larger and in one column. Whatever the screen, the page is then scaled to fit the paper, so a desktop layout on A4 is the whole width of the site, just smaller.
A4 or US Letter: pages you can print
A web page is one continuous strip. On paper it has to be cut into sheets, and the cuts fall wherever the sheet ends — sometimes through the middle of a picture or between a heading and its paragraph. Well-built sites tell the browser where not to cut; many do not. Saving a web page as a PDF explains why.
Choose paper when the PDF will be printed, attached to an email for someone to read page by page, or filed with other documents. Landscape suits wide pages — dashboards, tables, timelines — because more of the width fits on each sheet at a readable size. Margins only matter for printing: none uses the whole sheet, small leaves the edge a printer cannot reach, large leaves room to write notes or punch holes.
One long page: exactly what the screen shows
One long page makes the PDF as wide as the screen you chose and as tall as the whole site — a single sheet with no cuts at all. Nothing is split, nothing is scaled, and the result looks like a full-page screenshot that kept its real text: you can still search it, select it and copy from it.
It is the better choice for keeping a record of how a page looked (an offer, a policy, a listing before it changes), for sharing a design for review, and for anything read on screen rather than printed. Very long pages are shrunk to fit the largest page size a PDF allows, about five metres, and a long page is awkward to print — if you need both, make two PDFs.
Cookie banners, pop-ups and ads
A page opened fresh, by a browser that has never visited it, shows everything a first-time visitor sees: the cookie banner across the bottom, a newsletter box in the middle, a chat bubble in the corner. On a printed page they cover the text they float over, and on A4 a bar fixed to the screen repeats on every sheet.
Hiding pop-ups removes the common consent banners and anything fixed to the screen that covers a large part of it, and turns headers that stay on screen into ordinary ones, so they print once. Blocking ads refuses the big advertising networks, which also makes the page load faster. Neither is perfect — a site can always build its pop-up in a way nothing recognises — so check the preview, and if something remains, the PDF can be cropped or a page removed afterwards.
From its address, or from a saved file
Converting from the web address opens the live page in a fresh browser on our server, as an anonymous visitor: the result is the page as anyone sees it today. That is also its limit — a page behind a sign-in, or one that shows each visitor something different, cannot be reached that way.
For those, open the page in your own browser and save it as a single file (Save as → "Webpage, Single File", which makes an .mhtml), then upload that file: it carries the page exactly as you saw it, styles, pictures and fonts included. A page saved as "HTML only" leaves its styles in a separate folder and comes out as plain text — if you have one of those, convert the address it was saved from instead.
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Sources
Primary documentation for the claims above.