Size of #10 Envelope: What is a #10 Envelope and How Big is it?

The size of a typical #10 envelop is 9.5 x 4.125 inches

…and if you purchase a windowed size, the window placement will be a half-inch from the bottom and 7/8 inches from the left side.

The #10 envelope is used for business purposes. It can fit a letter when it is folded into three panes (tri-folded).

This envelope is used by a lot of businesses to send letters and invoices.

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