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Foundry✦pdf

PDF tool · in your browser

Password-protect a PDF without uploading

Encrypting a sensitive PDF on someone else's server defeats the point. Here the encryption happens entirely in your browser — the document and the password you choose never leave your device.

Network0 uploads

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

  • Lock a statement, contract, or personal record without server-side processing.
  • Protect a PDF under a workflow that forbids third-party file uploads.
  • Create an encrypted sharing copy while keeping the original unchanged.

Tips for a clean result

  • Use a password that is long, unique, and stored somewhere safe.
  • Test the downloaded PDF in a reader before deleting or moving the original.

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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