#9 Envelope Printing FAQs

• What size is a #9 envelope?

  A #9 envelope measures 3 7/8" x 8 7/8" (3.875" x 8.875").

• Does a #9 envelope fit inside a #10 envelope?

  Yes. A #9 fits inside a standard #10 (4 1/8" x 9 1/2") without folding, which is why it's the most common return…

• What is the difference between #9 and #10 envelopes?

  A #10 is 1/4" taller and 5/8" wider. Use #10s for outgoing mail and #9s as the reply envelope inside.

• What is a #9 envelope used for?

  Mostly return and remittance mail, such as bill payments, donations, RSVPs and signed forms.

• Will a folded 8.5" x 11" letter fit in a #9 envelope?

  Yes, a letter folded in thirds fits, though more snugly than in a #10. For multi-page letters, a #10 works better.

• Can I add a window to #9 envelopes?

  Yes. A standard address window is available. Window envelopes are ideal when your remit-to address is printed on a…

• Can you print business reply (BRE) envelopes?

  Yes, through a custom quote. You'll need a USPS Business Reply Mail permit.

• How fast can I get custom #9 envelopes?

  Choose 1–2, 2–4 or 5–7 business day production, depending on quantity.

• Can you print on both sides of a #9 envelope?

  Yes. Choose full color on both sides, or front printing plus back-flap printing for a thank-you message, website or…

• Can each #9 envelope be printed with different information?

  Yes. Variable address printing can add a unique customer name, return address, account number or donor ID to each…

• What file format do you need for variable addressing?

  Please send your mailing list as a CSV file (.csv). You can build it in Excel or Google Sheets, then choose File →…

• How should my mailing list be formatted?

  Your CSV needs one header row followed by one recipient per row. Label the header columns exactly as follows: Column…

• What if a recipient doesn't have a company name or suite number?

  Just leave that cell blank, but keep the column in your file. All five columns (A to E) should be present in every…

• Should city, state and ZIP code go in separate columns?

  No. Put the city, state and ZIP code together in column E, for example "GLENDALE CA 91202". Don't split them into…

• Will my addresses print exactly as I type them?

  Yes. We print each address exactly as it appears in your file, so check spelling, apartment numbers and ZIP codes…

• Why are leading zeros missing from some of my ZIP codes?

  Excel sometimes drops the leading zero from ZIP codes like 02108 (Boston), turning them into 2108. Before saving…

• Is fast 1–2 day turnaround available with variable addressing?

  No. The faster 1–2 business day turnaround isn't available for variable addressing orders. Your envelopes are produced…

• Is there an extra charge for variable addressing?

  Yes. Variable addressing is a paid add-on, and the price depends on your order quantity. Select variable addressing in…

• Can you print international addresses?

  Yes. We'll print any address you provide in the format above. Most customers mail to U.S. addresses, but for an…

• How many envelopes should I order with variable addressing?

  Order at least as many envelopes as there are names on your list. Many customers add a few extra blank envelopes for…