Exclusive to the trade Mon–Fri 8:00 am to 4:00 pm 206-767-3653
Envelope Converting ServiceSeattle, Washington

If you can dream it, we can make it.

Custom envelope converting for printers since 1985. Send us your pre-printed flat stock or blank stock and we convert it in 14 days or less.

CONVERT ONLY. No printing. We work for the printers.

“Exclusive to the Trade”

41years serving printers coast to coast, since July 1985
7–14day normal production, once stock arrives
Hundredsof dies in house, plus adjustable dies for odd sizes

Start here

Look up a die in seconds

Every high die, letterpress die and window die we run, searchable by number, size or style. Sheet sizes, yields, grain direction and layout templates all in one place.

Open the die finder

What we do

Three ways to convert your job

Manufacturing envelopes, gluing and folding is what we do. Pick the method that matches how critical your register is.

See it run

Watch the shop work

Two short videos. One walks through the converting process, the other introduces the company.

The process

Inside the plant

How your flat stock becomes a finished envelope, from die cutting through gluing and folding.

Who we are

Envelope Converting Service

A short introduction to the shop, the people and the work we do for printers.

An F.L. Smithe envelope machine at Envelope Converting Service, running red printed blanks through the folding and gluing section.
F.L. Smithe Machine Co., New York · still earning its keep on our floor

On the floor

The iron is old. The register is not.

That is one of our envelope machines mid-run, red printed blanks feeding through the folding and gluing section. The maker’s name is cast straight into the iron: F.L. Smithe Machine Co., New York. Nobody builds a frame like that anymore.

It still runs production every week. Machines like this were made to be adjusted, rebuilt and kept in service by people who know them, and that is exactly how we run them. The register you get on your job comes from an operator reading the sheet, not from a screen.

It is also why we ask for a blueline and a proper over run. Iron this good will hold register all day, but only if the stock and the layout are right going in.

Our commitment

An extension of your print shop

Envelope Converting Service was started with the concept of being an extension of the “Print Shop.” We will continue to support your efforts every way we can so that you can supply your customers with a full line of quality products.

Manufacturing envelopes, gluing and folding is what we do. And, with your continued support, we intend to be ready to solve any and all opportunities that you may send our way.

Please contact us with projects that need help and we will solve them together. Remember, your success is our success.

More about ECS

Important stuff! For both of us.

  • Include a blueline or previous sample with the job.
  • Stay away from anything lighter than 60lb vellum, especially for window and large size envelopes.
  • For critically registered bleeds and borders, use our letterpress cutting.
  • Full ink coverage requires no ink or varnish in glue and gum areas. Adhesion is not guaranteed otherwise.

Read the full FAQ →

Before you ship us stock

Order checklists

Run through the checklist for your job type. It is the fastest way to avoid a grain-wrong setup charge or a reprint.

Standard envelope types

Styles we convert

Open-side envelopes from 3″ x 4-1/4″ to 10″ x 15″. Catalog envelopes from 4-1/8″ x 5-3/4″ to 13-1/2″ x 16-1/2″. Square envelopes and special sizes on adjustable dies.

A Style envelope

A Style

A-style envelopes are constructed with a long, elegant square flap, hidden side seams and a shorter back. They are perfect for greeting cards, invitations and announcements.

Remittance envelope

Remittance

Remittance envelopes have a wallet flap which provides a large printing area for order blanks or donation information. Used by charities, schools, churches and mail order companies, these envelopes are usually printed on both sides, which flat sheet printing and converting makes super easy.

Baronial envelope

Baronial

Baronial envelopes, with their pointed flap, have a traditionally formal design well suited to invitations, promotions and formal correspondence.

Side Seam envelope

Side Seam

Side seam envelopes have a straight flap with round or square corners, hidden side seams and a full back. Their more custom appearance is popular with designers. Printers appreciate the smaller one-up sheet size which has the best yield from a parent sheet.

Diagonal Seam envelope

Diagonal Seam

Traditional commercial styling is used for many business and personal correspondence needs. Diagonal seams work best for automated inserting and postage metering. Nested multiple-up templates make flat sheet printing and converting very price effective.

Open End Catalog envelope

Open End Catalog

With the seal flap on the short end, these envelopes offer sturdy construction for mailing brochures and catalogs, and are more economical.

Open Side Booklets envelope

Open Side Booklets

Booklet envelopes have the flap on the long side and have a more formal appearance. They work well for machine inserting and are popular for sending large photos, statements and brochures.

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Ready to start a job?

Send us a PDF and we will price it out. Most jobs run in 7 to 14 days.