Courio
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Mail a PDF as a physical letter

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Document document.pdf_base64 PDF, up to 15 MB and 20 pages, not password-protected. A4 or US Letter.
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Destination and service

Postal service

service
Recipient
Sender

Printed as the return address. For registered mail, this is the legal sender.

Printing
Free. Nothing is mailed or charged at this step.