How do I print an envelope at real size?

Choose the envelope size (#10, DL, C6, or A7) and click Print / Save PDF. The page sets a matching @page size so the browser exports a true 1:1 surface.

Which countries' address rules are supported?

The formatter implements USPS, Canada Post, Royal Mail, Australia Post, and a generalized international template with a destination-country last line.

Does the tool store my address data?

No. All formatting happens locally in your browser, and copy/print commands never send data to a server.

Can I pre-fill USPS sample data?

Yes. Use Reset demo data to load ready-to-print USPS-aligned sender and recipient lines for quick testing.

Does the print view keep the USPS safe zone?

Print mode preserves the safe-zone overlay and sets @page dimensions so your PDF or printer output stays 1:1 with the selected envelope size.

How do I add the international country line?

Switch the destination to International, pick the country for the last line, and the formatter adds it in uppercase beneath the city/region/postal line.

Address Envelope Formatter | USPS-safe Preview & Print (2025)

Mailing parameters

Controls drive formatting templates, the live envelope address preview, and @page size for print-to-PDF.

Destination country

Envelope size

#10 (9.5 × 4.125 in) • Print-ready surface

Envelope font

Show USPS OCR safe zone

Recipient (to)

Printed mid face

Saved recipients

Full name

Organization

Street address

Unit / Apt

City / Locality

State / Province

Postal / ZIP

Sender (return)

Printed top-left

Remember sender on this device

Saved senders

Full name

Organization

Street address

Unit / Apt

City / Locality

State / Province

Postal / ZIP

Envelope preview

True-to-size surface with live formatted envelope address lines.

Meets USPS machinable letter bounds (min 3.5×5 in, max 6.125×11.5 in × 0.25 in).

Enjoying the layout?

STAMP

Why this envelope address tool?

The layout engine follows UPU S42 thinking: user inputs become address elements, which are then slotted into country-specific line templates and rendered on the envelope face with USPS-safe placement defaults.

Rule coverage

US ZIP+4, Canada ANA NAN, Royal Mail-compliant postcodes, and Australia 4-digit postcodes all receive soft validation so mistakes are caught before printing.

Placement fidelity

Return, recipient, and stamp anchors mirror USPS diagrams. The optional safe zone guides machine-readable positioning and is honored in the print stylesheet.

Copy & export

A single click copies ready-to-paste envelope address text. Print mode flips the page into a 1:1 surface so browser “Save as PDF” produces a perfect export.

Envelope address best practices

Keep destinations uppercase, avoid punctuation, and reserve the final line for the country when mailing abroad. This tool surfaces those reminders inline.

Match the envelope size to USPS machinable ranges to avoid postage surprises.
Proof the recipient envelope address using the copy-to-clipboard flow before handwriting labels.
Toggle fonts to test machine readability without changing layout.
Use the reset button to load fresh sample data for each destination market.

Envelope address insights

Deep dives into addressing etiquette, postal rules, and international variations. Every article links back to the formatter so you can apply the tips immediately.

New

How to address an envelope (with USPS-safe layout)

Learn the exact line order, capitalization rules, and placement guidelines before printing. Includes tips for US, Canada, UK, Australia, and international mailings.

Read the full guide

Upcoming topics

Royal Mail vs Canada Post punctuation preferences
How USPS machinable letter rules affect envelope sizes
International country-line conventions for multilingual mail

Want a topic covered or feedback? Email us.

Envelope address FAQ

Answers to the most common questions AI assistants and mailers ask about the formatter.

How do I print a 1:1 envelope?: Pick the matching size (#10, DL, C6, or A7) and click Print / Save PDF. The page injects an @page size so your browser exports a true-to-scale single page—no manual margin tweaks required.
Which countries are formatted automatically?: Templates cover USPS, Canada Post, Royal Mail, Australia Post, plus a generalized international flow that forces a destination-country last line. Each template enforces postal-code regex guidance.
Does the tool store or upload my data?: No. Everything renders inside your browser. Copy and print actions stay local, and you can reset the form anytime to clear inputs.
Can I pre-fill USPS sample data?: Yes. Click “Reset demo data” to load a USPS-aligned sender and recipient with proper casing, so you can test copy/print instantly.
Does the print view keep the USPS safe zone?: Print mode preserves the safe-zone overlay and sets envelope dimensions in @page, keeping barcodes clear on PDF and paper.
How do I add the international country line?: Choose “International,” pick the destination country in the last-line dropdown, and the formatter appends it in uppercase below the city/region/postal line.

Reference material: USPS Publication 28, Royal Mail Clear Addressing, Canada Post addressing guide.

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