10x 13 Large Envelopes (Custom Envelope Printing)

These large envelopes are the standard choice when you need to mail full-size documents, folders, or booklets without folding them. If your insert is up to 9" × 12", a 10" × 13" envelope gives you the room to slide it in flat and arrive looking professional.

Mailing a 9" × 12" document flat?

Whether you're a real estate agent sending a listing packet, a church mailing your annual report to donors, a school sending out enrollment folders, or a small business owner shipping a signed contract to a client, the 10" × 13" envelope is the one that lets your work arrive flat, crisp, and unbent. There's enough room inside for a presentation folder (even one with a thicker spine), a multi-page proposal, a magazine, or a stack of documents held together with a clip. If you only need to mail a few sheets of letter-size paper with nothing else inside, a smaller 9" × 12" envelope may be all you need — but the moment thickness enters the picture, step up to the 10" × 13".

Booklet vs. Catalog vs. Peel & Seal — which one do you need?

All three are 10" × 13" on the outside. The difference is where the opening is and how it closes.

Standard gummed flaps on the booklet and catalog versions are activated with moisture. The peel & seal version skips that step entirely.

What fits inside — and who mails them

10" × 13" envelopes are the workhorse for any business that mails important documents flat. Common uses we see every week:

• Real estate agents — listing packets, disclosure documents, closing folders
• Law firms & accountants — contracts, settlement statements, tax returns
• Nonprofits & churches — annual reports, donor packages, board materials
• Schools & universities — transcripts, enrollment packets, certificates
• Marketing teams — oversized brochures, postcard mailers, lookbooks, catalogs
• Medical offices — patient records, X-rays, intake packets
• Anything that shouldn't be folded — presentation folders (even high-capacity ones with a spine), price lists, newsletters, even tablets

Mailing your 10" × 13" envelopes through USPS

A 10" × 13" envelope is classified by USPS as a large envelope (also called a "flat") — not a letter. That means it uses a different postage rate than a #10 business envelope.

As of January 2026, USPS First-Class Mail large envelopes start at $1.63 for the first ounce, with each additional ounce adding to the cost. Maximum weight for a First-Class flat is 13 ounces — anything heavier needs to ship as Priority Mail. Your envelope must also stay rectangular, flexible, and uniformly thick to qualify, otherwise USPS adds a non-machinable surcharge. Current rates and weight tiers are published on the USPS First-Class Mail page.

Quick tip: If you're planning a larger mailing campaign, ask us about Every Door Direct Mail (EDDM) — for some projects it can be a much cheaper way to reach a whole neighborhood without needing individual addresses.

Color, customization & variable data

You can print your 10" × 13" envelopes in black ink or full color CMYK. Full bleed (printing all the way to the edge) is not offered for this product, so leave a small white border in your design.

If your project calls for it, we can also print with variable data — meaning each envelope can carry a different recipient address, account number, or even a different image. That's how you get personalized mailings without hand-addressing every piece.

And because the envelope itself is already going through the press, take advantage of the real estate: a return address, your logo, a tagline, or a teaser message on the front turns every envelope into its own small marketing piece before the recipient even opens it.

How to order

The minimum order is 25 envelopes. Use the calculator above to pick your opening style (booklet, catalog, or peel & seal), choose black or full color, and enter your quantity to see your price instantly. Need a quote on a larger run, or have a question before you order? Contact us — we're happy to help.

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Frequently asked questions

What size is a 10" × 13" envelope?
The exterior measures 10 inches by 13 inches. The interior holds documents up to about 9" × 12" flat, depending on the thickness of what you're inserting.

Will a 9" × 12" document fit in a 10" × 13" envelope?
Yes — flat and unfolded. The extra inch on each side gives you enough room to slide the document in cleanly without bending the corners.

What's the difference between a booklet and a catalog envelope?
Booklet envelopes open on the long (13") side, like a book. Catalog envelopes open on the short (10") side, loaded from the top. Both are 10" × 13" externally — pick whichever matches how you want the recipient to pull your document out.

How much postage does a 10" × 13" envelope need?
It mails as a USPS large envelope (flat). First-Class postage starts at $1.63 for the first ounce as of January 2026. Anything over 13 ounces ships as Priority Mail. Always weigh the finished envelope on a scale before applying postage. See USPS rates.

What is the minimum order?
25 envelopes. There's no maximum — we print runs of any size from 25 up.

Can I print in full color?
Yes. You can choose black ink only or full color CMYK. Full bleed printing is not available for this product, so keep your design within a small white border.

Can I print variable data, like addresses or custom images per envelope?
Yes. We can print each envelope with a different address, account number, or even a different image as part of the same job.

What paper are these printed on?
28 lb white wove envelope stock — the standard for professional business mailings.

Looking for a different size? See our full range of custom printed envelopes in all sizes.