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Half Fold

A Half Fold has two panels. Both panels are at full size.

Half fold letter folding style

Tri-Fold

A Tri-Fold has three panels. The two outside panels are at full size. The inside panel should be 1/16-inch narrower.

Trifold letter folding style

Double Parallel Fold

A Parallel Fold or Half-and-Half Fold has four panels. The two outside panels are at full size. The two inside panels should be 1/16-inch narrower.

Trifold letter folding

Z-Fold

A Z-Fold, also known as an Accordian Fold, has all panels at full size.

Z-fold diagram
Tabbing requirements for envelopes

Certifications & Associations

Kirkwood Direct certification badges