An envelope sealer is a device designed to securely seal envelopes, ensuring that their contents remain private and protected. These tools can be manual or electric, making the sealing process quick and efficient. They are commonly used in offices, mailing centers, and homes for sending letters, invitations, and important documents. Many envelope sealers work by applying adhesive to the envelope flap, which can be activated by heat or pressure. Some models are specifically designed for bulk sealing, making them ideal for businesses that send out large quantities of mail. Overall, envelope sealers enhance the mailing process by providing a reliable way to close envelopes securely.