Journal / Paper guides / A4 vs Letter Paper: Size, Printing, and Which to Choose

Published February 25, 2026 · Updated May 31, 2026 · 8 min readSection / Journal

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A4 vs Letter Paper: Size, Printing, and Which to Choose

A4 is 210 x 297 mm. Letter is 8.5 x 11 in. Compare A4 vs Letter, choose the right page size, and avoid hidden print scaling.

PGPaperGens · writing about print·February 25, 2026·Updated May 31, 2026·8 min read

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A4 and US Letter are close, but they are not the same paper size. A4 is 210 x 297 mm, or about 8.27 x 11.69 in. US Letter is 8.5 x 11 in, or 215.9 x 279.4 mm.

Choose A4 when the printer, school, office, or recipient is in an ISO-paper region. Choose Letter when the page will be printed in the United States, Canada, or another workflow built around 8.5 x 11 in paper. If the document is a measured printable template, do not ask users to scale one size into the other. Publish separate A4 and Letter PDFs.

Quick answer

Question	Short answer
Are A4 and Letter the same?	No. A4 is narrower and taller.
What size is A4?	210 x 297 mm, about 8.27 x 11.69 in.
What size is Letter?	8.5 x 11 in, or 215.9 x 279.4 mm.
Which should I choose?	Match the printer tray and reader region.
Can I scale one to the other?	Only for non-measured drafts, not for templates.

The safest rule is simple: design and export in the size people will actually print. Page-size conversion should happen in your document setup, not as a last-second print-dialog workaround.

Size comparison

Paper size	Inches	Millimeters	Shape
A4	8.27 x 11.69 in	210 x 297 mm	Narrower and taller
US Letter	8.5 x 11 in	215.9 x 279.4 mm	Wider and shorter

Letter is about 0.23 in wider than A4. A4 is about 0.69 in taller than Letter. Those differences are small enough to miss in a PDF preview, but large enough to clip a footer, shrink a graph grid, reflow a table, or shift a form field.

A4 also follows the ISO A-series ratio, where each size folds or cuts cleanly into the next. Letter belongs to the North American paper system. That is why A4, A3, and A5 relate neatly to one another, while Letter does not fold into the same ISO sequence.

Which one should you choose?

Start with the person who will print the file, not the person who created it.

Situation	Choose
US classroom, US office, or home printer with 8.5 x 11 in paper	Letter
UK, EU, Australia, New Zealand, or most ISO-paper offices	A4
International download or mixed remote team	Publish both A4 and Letter
Measured templates such as graph, lined, staff, or labels	Separate files for each size
Editable Word or Google Docs template	Set page size before writing content
One-off reading draft where exact spacing does not matter	Scaling can be acceptable

If you do not know the recipient's printer, ask where the page will be printed. A US designer can create an A4 PDF, and a European teacher can receive a Letter PDF. The authoring location matters less than the printer tray.

Why the difference causes print problems

Most people notice A4 vs Letter only when something prints wrong. The usual symptoms are:

A footer, border, or page number disappears.
A one-page worksheet becomes two pages.
A form field no longer lines up with its label.
A grid, dot spacing, or ruled line measures smaller than promised.
A table that fit in the PDF preview wraps after printing.
The print dialog warns about a paper mismatch.

The page may look normal on screen because the viewer scales the PDF to fit the window. The problem appears when physical paper, document page size, and printer settings disagree.

This matters most for printable tools. A paragraph can survive a small shrink. A 5 mm graph, handwriting guide, music staff, index-card layout, or cut line cannot. If a template promises real spacing, export it in the correct page size and print it at 100%.

A4-to-Letter and Letter-to-A4 scaling

When an A4 PDF goes to a Letter printer, the printer usually has three choices:

Shrink to fit, which changes every measured element.
Clip the page, which can cut off top or bottom content.
Center with margins, which may leave uneven whitespace.

When a Letter PDF goes to an A4 printer, the problem changes. A4 is taller, but narrower. Content that was comfortable across Letter width may feel tight on A4, and tables or wide forms may reflow.

For plain reading copies, shrink-to-fit may be good enough. For templates, it is a quality problem. A user who downloads graph paper, lined paper, or a form expects the printed page to match the design. Scaling undermines that promise.

How to convert a document properly

Do not convert by clicking "Fit" in the print dialog. Convert the source document.

Duplicate the original file.
Set the new document page size to A4 or Letter.
Rebuild margins for the new sheet.
Check tables, headers, footers, images, and page numbers.
Re-check measured elements such as grids, ruling, boxes, and cut marks.
Export a new PDF with the target page size.
Print one proof at Actual size or 100%.

For text-heavy files, the conversion may be quick. For templates, it often requires layout decisions. A narrower A4 page may need a different margin. A shorter Letter page may need fewer rows, a smaller header, or an adjusted footer.

Print settings that prevent silent resizing

Before printing either size, check all three layers:

Document setup: The source file or PDF page box is A4 or Letter as intended.
Printer media: The tray contains the matching physical paper.
Scaling option: The dialog is set to Actual size or 100% for measured printables.

Browser print dialogs, PDF viewers, Word, Google Docs, and printer drivers can each apply a default. If a page keeps coming out wrong, check more than one place. A PDF can have the right visual design but the wrong page box. A printer can have the right paper loaded but the driver can still shrink the page.

For PaperGens templates, use the page size shown in the template name and print without fit-to-page scaling. That keeps line spacing, grid pitch, dot spacing, and margins aligned with the preview.

What to publish for downloads

If your audience is mixed, publish two files:

worksheet-a4.pdf
worksheet-letter.pdf

This is better than one file plus a note that says "scale to fit." The filename travels with the download, and the user can pick the version that matches the printer. It also helps search snippets and internal links because the page can clearly offer both regional defaults.

Use separate preview labels too. A thumbnail alone rarely shows the size difference, especially when both pages are portrait and similarly shaped.

Template recommendations

Use page-size-specific templates when spacing matters:

Need	Best starting point
International notes and handouts	A4 college ruled paper
US notes and handouts	Letter college ruled paper
A4 planning, bullet journal, or sketch pages	A4 dot grid paper

Common mistakes

Creating a Letter document and naming the export A4.
Sending one PDF to both US and ISO-paper audiences.
Trusting the PDF preview instead of checking document properties.
Printing measured templates with Fit to page enabled.
Changing page size after writing a long document without rechecking tables.
Designing margins in inches for an A4 workflow that otherwise uses millimeters.
Forgetting that some printers cannot print to the physical edge of either sheet.

The fix is not to memorize every paper size. It is to make page size a first-class decision at the start of the file.

FAQ

Is A4 the same as Letter? No. A4 is 210 x 297 mm, or about 8.27 x 11.69 in. Letter is 8.5 x 11 in.

Which is bigger, A4 or Letter? A4 is taller. Letter is wider. They are close in area, but their shapes are different.

Can I print A4 on Letter paper? You can usually print it by shrinking or clipping, but measured templates will no longer be exact. Use a Letter version when the printer has Letter paper.

Can I print Letter on A4 paper? Yes, but wide content may reflow or shrink. Use an A4 version when the printer has A4 paper.

Should online downloads include both sizes? Yes when the audience spans North America and ISO-paper regions, especially for graph paper, lined paper, forms, labels, and classroom worksheets.

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