Envelope Inserters

An envelope inserter, also known as a folder inserter machine, folds invoices, statements, letters, and marketing pieces and inserts them into envelopes, replacing hours of hand stuffing with consistent, automated output. This range includes entry-level models such as the Formax FD 6104 and Intimus TSI-2.5S, which process up to 1,350 envelopes per hour, mid-volume Formax 6406 and 6608 Series folder inserters that read OMR, BCR, and OCR codes, and high-volume Formax FD 7104 and 7700 Series mail inserting machines that reach up to 7,000 envelopes per hour. Compare feeder count, sheets per envelope, fold types, and daily volume, and pair the inserter with paper folders for jobs that only need folding.

Envelope Inserters

An envelope inserter, also known as a folder inserter machine, folds invoices, statements, letters, and marketing pieces and inserts them into envelopes, replacing hours of hand stuffing with consistent, automated output. This range includes entry-level...

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Formax FD 6104 Low-Volume Automatic Folder and Inserter
Formax

Item#: FD6104

$7,495.00

features

  • Inserts up to 1,350 pieces per hour and 5,000 per month for low-volume offices
  • Two 100-sheet feeders plus a dedicated feeder for up to 100 inserts or BREs
  • Folds C, V and double parallel into envelopes 8.8" to 9.5" W x 4.1" to 6" H
  • 5" color touchscreen stores 15 jobs, with an optional tri-fold kit for brochures
$7,495.00
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Intimus TSI-2.5S Automatic Mail Folder & Inserter
Intimus

Item#: TSI20S25S

$5,800.00

features

  • Up to 1,350 envelopes/hour
  • Fold types include letter, single, double parallel, and no fold
  • Folding capacity of up to 5 sheets
  • Automatic and manual operating modes
$5,800.00
Formax 6212 Series Fully Automatic Folder and Inserter
Formax
$20,695.00
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features

  • Inserts 2,000 per hour and 15,000 per month, or 2,500 and 20,000 with upgrade
  • Five models with one or two 325-sheet feeders, adding a BRE or special BRE feeder
  • Folds C, V, Z and double parallel into #10 and 6" x 9.5" envelopes
  • 7" color touchscreen with 50 stored jobs and AutoSet, plus optional OMR/BCR scanning
$20,695.00
Formax FD 6308 Series Fully Automatic Folder/Inserter
Formax
$33,095.00
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features

  • Inserts up to 3,800 pieces per hour and 40,000 per month for small mailrooms
  • Four models with 2 or 3 stations, mixing 325-sheet, 725-sheet and special feeders
  • Folds C, V, Z and double parallel into envelopes 5.5" to 9.8" W x 3.5" to 6.4" H
  • 7" color touchscreen with 50 stored jobs and AutoSet, plus optional OMR/BCR scanning
$33,095.00
Formax 6406 Series Mid-Volume Inserter and Folder
Formax
$46,395.00
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features

  • Fills up to 4,000 #10 envelopes per hour, built for up to 60,000 pieces per month
  • 2 to 6 stations in 10 configurations, with standard feeders holding 325 sheets each
  • Folds up to 10 sheets half fold or 8 tri-fold into envelopes up to 9.7" x 6.3"
  • 7" color touchscreen with AutoSet and 50 stored jobs for quick job changeovers
$46,395.00
Formax 6608 Series Mid-Volume Folder and Inserter
Formax
$59,795.00
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features

  • Fills up to 4,300 #10 envelopes per hour, built for up to 80,000 pieces per month
  • 2 to 6 stations in 10 configurations, or 7 with a booklet feeder (up to 2.5mm thick)
  • Folds up to 10 sheets half fold or 8 tri-fold into envelopes up to 9.7" x 6.3"
  • 10" color touchscreen with AutoSet and 50 stored jobs for quick job changeovers
$59,795.00
Formax FD 7104 Series High-Volume Folder and Inserter
Formax
$58,600.00
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features

  • Inserts 4,500 to 5,500 envelopes per hour and up to 180,000 pieces per month
  • 1 to 3 tower feeders holding 1,000 to 1,500 sheets, expandable to 17 feed stations
  • Folds up to 8 sheets in C, Z, half or double parallel for #10 and 6" x 9" envelopes
  • 22" touchscreen with unlimited jobs, optional 2-sided OMR and barcode reading
$58,600.00
Formax 7700 Series High-Volume Inserters
Formax

Item#: FORMAX-7700

features

  • Inserts up to 7,000 #10 envelopes per hour and 300,000 per month for direct mail
  • 1 to 4 station tower feeder with up to 2,000 sheets, expandable to 11 feed stations
  • Folds C, Z, half and double parallel for #10 envelopes and inserts 10" x 13" flats
  • 22" touchscreen with unlimited jobs, optional OMR, BCR, 2D and QR code reading

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Frequently Asked Questions

Choose an envelope inserter by reviewing your mailing volume, document types, fold styles, and envelope sizes. In this range, a folder inserter machine runs from about 1,350 envelopes per hour on entry models like the Formax FD 6104 and Intimus TSI-2.5S up to 7,000 envelopes per hour on the Formax 7700 Series. A smaller office may only need a low-volume machine for recurring invoices, statements, or notices. A busy mailroom should look for higher speed, stronger feeder capacity, batching options, and reliable document detection. Also check whether the machine supports the number of sheets you normally send in each envelope. Some jobs include reply envelopes, small inserts, or multiple pages, so the inserter must match the real workflow. The right machine should reduce hand folding, lower mailing errors, and save staff time.

An envelope inserter, also called an envelope stuffing machine or mail inserter, makes sense when manual folding and inserting takes too much time, causes errors, or slows down regular mailing jobs. Offices that send invoices, statements, renewal notices, customer letters, or marketing mail can benefit from automation once the volume becomes steady. A machine can help prepare mail faster and more consistently than hand work. If your team is also handling folding, sealing, or sorting, compare the inserter with other mailroom equipment. The best time to upgrade is when the cost of staff time and errors becomes higher than the value of keeping the process manual.

The most important features are feeder capacity, supported fold types, envelope compatibility, job memory, and double-document detection. Feeder capacity matters when you run larger mail jobs or send multi-page sets. Fold options matter because invoices, letters, and notices may not all use the same fold. Job memory can save time when the same mailing task repeats often. Double-document detection is especially useful when every envelope must include the correct number of sheets. Speed is important, but it should not be the only factor. A slower machine with cleaner feeding and easier setup may be better for many offices.

Many envelope inserters can handle a range of document sizes, fold styles, and envelope types, but each machine has limits. Before buying, compare your usual paper size, sheet count, insert type, and envelope style with the machine’s supported range. If your mailings include reply envelopes, small inserts, or no-fold pieces, confirm those details before ordering. It may also help to review related paper handling equipment if documents need to be cut, folded, stacked, or prepared before insertion. A good match should fit your current mail jobs without forcing major workflow changes.

Avoid choosing an envelope inserter based only on top speed or price. A machine that is fast but difficult to set up can still slow down the mailroom. A lower-cost unit may also be a poor fit if it cannot handle your sheet count, fold style, or envelope type. Do not ignore feeder capacity, job programming, and document detection. Also consider who will operate the machine. If several people will use it, the controls should be simple enough for regular use. The best envelope inserter is the one that fits your daily mailing pattern and reduces repeat errors.