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Foundry✦pdf

PDF tool · in your browser

Password-protect a PDF on iPhone

Lock a PDF before sharing it from your phone without uploading the document or password. Safari performs the encryption on-device and downloads a copy that asks for the password in standard PDF readers.

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Drag & drop PDF file here

or click to choose a file

PDF · processed in your browser, never uploaded

How it works

  1. 1Select your PDF.
  2. 2Type a password (at least 4 characters).
  3. 3Click Password Protect — the encrypted PDF downloads instantly.

When this helps

  • Protect a statement, contract, or ID document before attaching it to an email.
  • Add a password to a PDF saved in Files before transferring it elsewhere.
  • Create a locked copy while keeping the unencrypted original on your phone.

Tips for a clean result

  • Send the password through a different channel from the PDF attachment.
  • Keep the password somewhere safe; FoundryPDF never receives it and cannot recover it.

Frequently asked questions

Where is my password sent?+

Nowhere. Encryption runs in your browser; the password never leaves your device. If you lose it, the file can't be recovered.

What encryption is used?+

Standard PDF password encryption, so any PDF reader will prompt for the password.

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