Invoice Paper Size: A4 vs Letter (Margins, PDF, Print)

Quick answer: Use A4 (210 x 297 mm) for invoices if you or your client are in Europe, the UK, Asia, Africa, Australia or most of the world, and US Letter (8.5 x 11 inches) if you are in the United States, Canada or Mexico. Keep margins of at least 12 to 20 mm (0.5 to 0.75 inch) so either size prints cleanly.

Invoice paper size sounds like a small detail until a client prints your PDF and the bank details at the bottom are cut off. This guide explains the standard invoice sizes, which one to pick for domestic and international clients, the margins and fonts that keep an invoice readable, and how PDF settings affect what your client sees on screen and on paper.

What is the standard invoice paper size?

There is no single global invoice size. The standard is simply the normal office paper in your country. Most of the world uses the ISO 216 "A" series, defined by the International Organization for Standardization (ISO 216), where A4 is the everyday sheet. The United States and Canada use North American sizes, where US Letter is the everyday sheet.

Tax authorities do not specify a size either. The IRS, HMRC and the EU VAT Directive set rules about invoice content (who, what, when, how much, what tax), not about paper. So your choice is practical: pick the size your client's printer and filing system expect, and design the layout so it survives the other size.

Invoice size comparison: A4 vs Letter vs Legal vs A5

Size	Millimeters	Inches	PDF points	Where it is used for invoices
A4	210 x 297	8.27 x 11.69	595 x 842	UK, EU, India, Pakistan, UAE, Australia, New Zealand, most of Asia, Africa and South America
US Letter	215.9 x 279.4	8.5 x 11	612 x 792	United States, Canada, Mexico, Philippines (widely)
US Legal	215.9 x 355.6	8.5 x 14	612 x 1008	Rarely for invoices; some legal and real estate documents
A5	148 x 210	5.83 x 8.27	420 x 595	Short invoices, receipt books, on-site trade invoices
Thermal roll	80 or 58 mm wide	about 3.1 or 2.3 wide	variable length	Point-of-sale receipts and simplified invoices

The key difference: A4 is about 6 mm narrower and 18 mm taller than Letter. That is why an invoice designed edge to edge for one size gets clipped or shrunk on the other, while an invoice with sensible margins looks almost identical on both.

A4 or Letter: which invoice size should you choose?

Use this simple rule of thumb:

• All your clients are local: use your country's standard size. A UK plumber uses A4; a Texas contractor uses Letter.
• You are in the US and bill a European client: Letter is fine. Most people never print invoices now, and those who do usually print with "Fit to page".
• You bill a large company with an accounts payable team abroad: match their size if you know it, because some scanning and OCR workflows are tuned to local paper.
• You bill clients everywhere: pick your home size and keep margins at 15 to 20 mm. That is the most practical way to make one template work worldwide.

For more on billing across borders, including currency and tax IDs, see our guide to invoicing international clients and the overview of invoice requirements by country.

How big should invoice margins be?

Most office printers cannot print right to the edge. The unprintable area is typically 3 to 6 mm, more on some inkjets. Margins also make the invoice look calm and give room for hole punches, staples and handwritten notes from the client's finance team.

Element	Recommended size	Why
Side margins	15 to 20 mm (0.6 to 0.8 in)	Survives A4/Letter scaling and printer limits
Top margin	12 to 20 mm (0.5 to 0.8 in)	Room for logo and header without crowding
Bottom margin	15 to 25 mm (0.6 to 1 in)	Footers with bank details are the first thing cut off
Body text	9 to 11 pt	Readable on paper and on a phone screen
Totals and amount due	12 to 16 pt, bold	The number the client looks for first
Fine print (terms)	8 pt minimum	Anything smaller is hard to read when printed

If you add company registration details, a VAT number or payment instructions at the bottom, follow our tips on the invoice header and footer so they stay inside the safe area.

How does invoice size work in a PDF?

A PDF stores its page size in points (1 point = 1/72 inch). When someone opens your invoice on screen, the page size barely matters because the viewer zooms to fit. It matters when they print. Most PDF readers offer three options:

1. Actual size: prints at 100%. An A4 PDF on Letter paper loses a few millimeters at the top and bottom unless your margins absorb it.
2. Fit or Shrink oversized pages: scales the page down so everything fits. A Letter invoice printed on A4 shrinks by about 3%, which nobody notices.
3. Custom scale: rarely needed for invoices.

Practical takeaway: generate your invoice in your home size, keep margins generous, and you rarely need to think about it again. Our invoice template PDF guide covers file naming, fonts and how to keep the PDF small enough to email.

Worked example: one invoice on A4 and on Letter

Say a freelance designer in Manchester bills a client in Chicago. The invoice is created on A4 with 18 mm margins on every side. Here is the content:

Description	Qty	Rate (USD)	Amount (USD)
Brand identity design, logo and color palette	1	1,800.00	1,800.00
Business card and letterhead layouts	2	250.00	500.00
Brand guidelines PDF (12 pages)	1	650.00	650.00
Revision hours beyond 2 rounds	3	75.00	225.00
Subtotal			3,175.00
VAT (outside the scope of UK VAT, B2B service to US client)			0.00
Total due			3,175.00

What happens when the Chicago client prints it:

• Actual size on Letter: the page is about 17.6 mm too tall. With an 18 mm bottom margin, about 9 mm is lost at the top and 9 mm at the bottom, which falls inside the margins. Nothing important is cut.
• Fit to page on Letter: the page scales to about 94% to fit Letter's 279 mm height. The 10 pt body text prints at roughly 9.4 pt, still easy to read.

Had the designer used 5 mm margins with the bank details at the very bottom, the actual-size print would have clipped the IBAN, and the client might have paid late or asked for a resend.

How to set up an invoice template that prints well anywhere

1. Choose your page size first. Pick A4 or Letter before you design, because changing it later shifts every element.
2. Set margins of 15 to 20 mm. Treat this as a hard boundary for text, totals and payment details.
3. Place the address block for window envelopes. If you post invoices, align the client's address with a DL (110 x 220 mm) or US No. 10 envelope window.
4. Keep the logo small and high resolution. Around 30 to 45 mm wide at 300 DPI is plenty. Our guide on how to add a logo to an invoice covers file types and placement.
5. Use a clear table for line items. Description, quantity, rate and amount, with totals right-aligned.
6. Put payment details near the total. Not in tiny footer text that can be trimmed.
7. Repeat key details on extra pages. Invoice number, client name and "Page X of Y".
8. Test print once on both sizes. Print at actual size and at fit to page, and check that nothing is cut.

You can skip most of this setup by using our free invoice generator, which lays out a clean, print-safe invoice and downloads it as a PDF. If you prefer starting from a file, browse the invoice templates page.

What about receipts, thermal printers and e-invoices?

Retail and hospitality businesses often print receipts or simplified invoices on 80 mm or 58 mm thermal rolls. These are fine as proof of payment for small sales, but many countries require a full invoice for business customers who want to reclaim VAT or GST, so keep an A4 or Letter version available on request.

Structured e-invoices (XML formats such as UBL, CII or Peppol BIS) have no paper size at all, because they are data, not documents. A PDF copy may be attached for humans to read. If your country is moving to mandatory e-invoicing, read our explainer on e-invoices vs PDF invoices to understand what still counts as a valid invoice.

Should an invoice be portrait or landscape?

Portrait. Almost every accounting team, scanner and filing system expects invoices in portrait orientation, and a portrait page reads naturally on a phone screen too. Landscape only makes sense for an attachment with many columns, such as a detailed timesheet or a shipment manifest. In that case, keep the invoice itself in portrait and attach the wide schedule as a separate page or file, referenced by the invoice number.

Does the size affect how an invoice is stored?

Not legally. Tax authorities accept invoices kept as PDFs regardless of the page size, as long as the file is complete, readable and unchanged. What matters more is a consistent file name (for example "INV-2026-041 Client Name.pdf") and a backup. If a client's AP system extracts data automatically, a clean layout with clear labels for invoice number, date and total helps far more than any particular paper size.

Common invoice size and layout mistakes

• Edge-to-edge designs. Background colors and borders that run to the edge print with white strips or get clipped.
• Payment details in the bottom 10 mm. The area most likely to be cut off when an A4 file is printed on Letter.
• Mixing sizes in one PDF. A Letter invoice with an A4 timesheet attached prints inconsistently. Keep every page the same size.
• Tiny fonts to squeeze everything onto one page. Two readable pages beat one unreadable page.
• Screenshots instead of PDFs. Images have no fixed paper size, often print blurry and cannot be searched.
• Huge logo files. A 10 MB logo makes a 10 MB invoice that email filters may block.

Before you send, run through our invoice PDF and print checklist to catch these issues in under a minute.

Invoice paper size checklist

• Page size matches your home country (A4 or US Letter).
• Margins of at least 15 mm (0.6 inch) on all sides.
• Body text 9 to 11 pt; total due bold and larger.
• Payment details placed near the total, not in the outer edge.
• Every page the same size; header details repeated on extra pages.
• Logo crisp at 300 DPI and under about 200 KB.
• Test printed at actual size and fit to page.

In short, the right invoice paper size is the standard sheet in your market: A4 for most of the world and US Letter for North America, with margins wide enough that the invoice prints correctly on either. Our free invoice generator needs no sign-up, builds the invoice in your browser and downloads a print-ready PDF, so you can create a clean A4 or Letter invoice in a few minutes.