Print at the Right Size: A4, Letter, Scaling and PDF

Why a document that fits on screen spills to a second page, how to make A4 and US Letter agree, and how to save a print job as a PDF without a conversion service.

By Print Studio Published 2026-09-16 Updated 2026-09-17

Most disappointing prints are not caused by the document. They are caused by one of four settings in the print dialog, and knowing which one to look at turns a reprint into a ten-second fix.

Before opening the print dialog

Finish the preview first. Confirm the paper size, orientation and page count. For photographs, check cropping and resolution. For measured templates, confirm the spacing unit. A preview is the cheapest place to catch a wrong choice, and on a measured sheet it is the only place the choice can be changed without cutting paper.

Two further things are worth doing before the dialog opens. Close other tabs that might hold a print job, because some browsers route the dialog to the wrong document. And if the page has a clear data control, use it or leave it alone deliberately — a print job that includes last week’s customer name is a small privacy incident with a long afterlife.

Match the document and the printer

The two paper sizes are close enough to look alike on screen and far enough apart to matter once the driver gets involved. A4 measures 210 by 297 millimetres; US Letter measures 215.9 by 279.4 millimetres. Choosing one size in the document and the other in the print dialog is what invites automatic shrinking.

	A4	US Letter	Difference
Width	210 mm	215.9 mm	Letter is 5.9 mm wider
Height	297 mm	279.4 mm	A4 is 17.6 mm taller
Aspect ratio	1:1.414	1:1.294	A4 is the taller-looking sheet
Usual markets	most of the world	United States, Canada, Mexico, Philippines	—

The important consequence is that neither size fits inside the other. A layout tuned for A4 has more vertical room and less horizontal room than the same layout on Letter, so a table can be one column short on one sheet and one line too long on the other. When a document will be printed in both markets, leave a little slack on both axes rather than tuning to one.

The four settings that decide the result

Setting	What to choose	What goes wrong otherwise
Paper size	Same as the document	The driver scales the content to fit, silently
Scale	100 %, or Actual size	Fit-to-page shrinks by 2–6 %, which is enough to undo a margin
Headers and footers	Off	The browser prints the date and page address over your content area
Margins	Default, or None if the document carries its own	Two sets of margins narrow the text column twice

A fifth setting matters only when something looks wrong in a specific way: Print as image, sometimes Print backgrounds. Leaving it on converts text into a picture, which fixes some driver faults and destroys the ability to select or search the text in the result. It is worth trying only after the other four have been checked.

Using the browser’s PDF destination

The print button opens a separate printable document. Choose Save as PDF, Print to PDF or the operating system’s equivalent. The wording depends on the browser and the operating system, and on some systems the PDF option lives behind a Destination or Printer menu rather than a Format menu.

This path uses the same rendering engine as a physical print, which is the reason to prefer it: a PDF that looks right on screen will look right when printed, because both went through the same layout. No paid conversion service or uploaded file is involved, and a PDF produced this way keeps the page size the dialog was set to.

If the print window does not open, allow pop-ups for the site and try again. If the resulting PDF has an extra blank page, check headers, footers, printer margins and scaling in that order — they account for nearly all of them.

Verifying physical dimensions

Choose 100 percent or Actual size for anything measured. Print one sample before a batch, then use a ruler on a known span: ten spaces on a 5 mm grid should measure 50 mm, taken between line centres.

Any vector file can be scaled by whatever application imports it, so the check has to be done on paper rather than in the file. An SVG that measures correctly in a browser can still arrive at a different size once a document editor has decided how to place it, which is why the instruction is to set the page size in the importing application rather than to resize the drawing.

Choosing the right export

Format	Behaves like	Best for	Watch out for
PDF via print	A fixed-layout document	Sharing and printing anywhere	Page size travels with the file
SVG	Vector geometry	Resizing, editing in a drawing application	Embedded text uses a system font
PNG	A fixed pixel image	Image-only workflows	Becomes soft if enlarged past its resolution
A physical print	Paper	Anything that has to be in a hand	The four settings above

Each format suits a different destination, and the choice is usually obvious once the destination is named out loud. A form that will be filled in by hand wants paper. A file that will be sent to a print shop wants a PDF. A drawing that will be resized wants vector. A picture that will be dropped into a slide wants a PNG at a sensible pixel size.

Troubleshooting by symptom

Symptom	Look at	Likely fix
Everything 2–6 % smaller	Scale	Set 100 percent
One edge clipped	Printer margin	Raise the document margin or change the printable area in the driver
A blank page at the end	Headers, footers, bottom margin	Turn them off, reduce the margin
Landscape content printed portrait	Orientation in both places	Set it in the document and in the dialog
Text looks like a picture	Print as image	Turn it off
Colours missing in shapes	Print backgrounds	Turn it on
The print dialog shows the wrong document	Tabs	Close other tabs and print again

Printer margin guide — how much of the sheet a printer refuses to print on, and how to measure it.
Custom paper templates — measured stock to check the scaling with a ruler.
Graph paper generator — a grid whose spacing is easy to verify after printing.
Resume template — a document where a two-line spill onto a second page really matters.
Invoice template — a document where a column that moves between paper sizes gets queried.
PDF tools without uploading — what can be inspected locally before a PDF is sent anywhere.

Before you hit print

Why does my document print smaller than the preview?

Almost always because a scaling option is active in the print dialog. Settings named Fit to page, Shrink to printable area or Scale to fit change the output size by a few percent. Setting the scale to 100 percent, or Actual size, removes the correction the browser was applying.

Why is there an extra blank page at the end?

The content is a fraction taller than the paper. A stray blank line, a footer the browser adds, or a page margin a millimetre over the sheet height is enough. Turning off browser headers and footers, and reducing the bottom margin, usually removes it.

Do I need a PDF conversion website?

No. Every current browser can print to a PDF file as one of its print destinations, using the same rendering path it uses for paper. A conversion service adds an upload and a privacy question without adding any capability.

Which is bigger, A4 or US Letter?

Letter is wider by 5.9 mm and shorter by 17.6 mm. Neither contains the other, which is why a layout tuned to one is not automatically right on the other: A4 gives more vertical room and less horizontal room.

Does the paper size in the tool matter if I only save a PDF?

It matters more than for a physical print, because a PDF carries a fixed page size. Choosing A4 in the tool and Letter in the dialog produces a file whose content sits on a sheet it was not designed for, and the mismatch travels with the file.

How do I check that the size is exactly right?

Print one sheet at 100 percent scale and measure a known dimension with a ruler. On a 5 mm grid, ten spaces should measure 50 mm between line centres. A measurement is the only check that covers the browser, the driver and the printer together.