Ranging from manual to automatic folding machines that can process many different sizes and weights of paper. There are many variations.

Also known as envelope stuffers, they collate, fold, and insert paper into an envelope and seal it. Many sizes and capabilities.

Sealers fold pressure sensitive forms into self mailers. For large volumes, they are cheaper than using envelopes.

Tabbers automatically put a small tab on a folded piece of paper to make it a self mailer. Fast and inexpensive.