Why a US Letter PDF Never Prints Right on A4 Paper

A client in Chicago sends over the signed contract. It looks fine on screen. You hit print, and the last line of every page is missing. Or the text sits too high, there’s a band of white along the bottom, and the left margin is visibly fatter than the right. Your printer is fine. The document was laid out for a different sheet of paper than the one sitting in your tray.

Two paper standards have been coexisting for decades. Most of the world prints on A4, 210 × 297 mm. The United States and Canada print on Letter, 216 × 279 mm. Letter is 6 mm wider and 18 mm shorter. Close enough that nothing looks wrong on a monitor, far enough apart that a print job has to make a decision about those 18 millimetres — and it usually makes it without asking you.

If you get documents from across the Atlantic regularly, the clean fix is to change the page size of the file itself, once, with Resize PDF pages, instead of fighting the print dialog every time.

What your print dialog is actually doing

Every printer driver has some version of “Fit to page”, “Shrink oversized pages” or “Scale to paper size”. Those options do work, in the sense that the ink lands on the paper. But three things are worth knowing about them.

They scale at print time and change nothing in the file. The next person who opens that PDF gets the same guessing game, and if they have a different driver they get a different result.

They often scale silently. A document set to “actual size” on a machine that ignores the mismatch will simply clip whatever falls outside the sheet, which is exactly how footers and page numbers disappear.

And they centre inconsistently. Some drivers keep the top-left corner and let the overflow fall off two edges. That’s where lopsided margins come from — the file wasn’t lopsided, the fitting was.

Changing the page size properly

Resizing a PDF means every page is rebuilt at the target size with the content scaled to fit inside it and centred, so the file itself is now an A4 document. Drop it, pick A4, save. From then on it prints the same way on any machine, and anyone you forward it to gets a file that already matches their paper.

Three behaviours worth knowing before you run it:

• Proportions stay by default. The content is scaled by the same factor on both axes, so nothing stretches. Because Letter and A4 aren’t the same shape, you get a couple of millimetres of extra margin on one axis. That’s the correct outcome. Distorting the page to fill every last millimetre is a separate option you have to switch on deliberately, and it will make the text look subtly wrong.
• Orientation is per page. If your document has one landscape page in the middle — a wide table, a floor plan — it stays landscape and becomes landscape A4. Nothing rotates on its own.
• Mixed sizes get unified. Scanned bundles are often a mess: some pages Letter, some A4, one Legal because someone’s scanner was set differently. You can target A4, or you can target “same as the first page”, which is handy when the document already starts with the size you want and you just need the rest to fall in line.

The part that gets lost

Every page is drawn again at the new size, and that has a cost you should know before you click. Annotations don’t survive: links, sticky comments, highlights. Form fields don’t survive either, and neither do bookmarks. The document metadata is carried over, and your original file is never touched.

In practice that means order of operations matters. If the contract still has to be filled in and signed, do that first and resize afterwards, or resize a copy and keep the interactive original. If the PDF is a 300-page report whose bookmarks are the only way to navigate it, think twice about whether printing is worth losing them — sometimes the print dialog’s scaling is the lesser evil for a one-off.

Resizing is not cropping

These get confused a lot. Crop PDF pulls the visible edge of the page inward to hide wide white margins; the content stays exactly the size it was. Resizing keeps the whole page and changes how big the sheet is, scaling the content to match.

So if a scanned book has five centimetres of white around the text and you want it bigger on a tablet, you want cropping. If a document is on the wrong paper standard, you want resizing. If you’re merging things from different sources into one bundle — the situation in combining scanned receipts into one PDF — resizing everything to a single size first makes the merged file behave much better.

Doing it without uploading anything

The documents that arrive in the wrong paper size are rarely trivial: employment contracts, invoices, medical results, legal filings from a firm abroad. Running them through some free online converter to solve a paper-format problem means handing a signed private document to a server for no reason at all.

reader.me does the whole thing in your browser. The file is read into memory on your own machine, the pages are rebuilt there, and the new PDF saves straight to your downloads. Nothing is uploaded. Open the Network tab in your browser’s developer tools while you work and you’ll see it, or just disconnect from the internet and run it offline — it still works, the same way compressing a PDF without uploading it does.

Next time something arrives in Letter and your office prints A4, convert the file once instead of arguing with the print dialog on every machine it touches.