Sharing a contract, a payslip, an NDA, or a board pack? Don't email it naked. Adding a password takes 30 seconds and prevents the file being opened if it's forwarded, leaked, or grabbed off a misplaced laptop. Here's how to password protect a PDF for free in 2026.
Password protect a PDF in 4 steps
- Open the Protect PDF tool.
- Drop your PDF onto the upload area.
- Type a strong password (and confirm it).
- Download the encrypted PDF — recipients will be prompted for the password before they can open it.
What makes a strong PDF password?
- At least 14 characters — longer is exponentially harder to brute-force.
- Mix uppercase, lowercase, numbers and symbols.
- Avoid dictionary words, names, or anything that appears on your social profiles.
- Never reuse the password from another account.
- Use a passphrase like "river-blue-pencil-42!" — easy to remember, hard to crack.
How to share the password safely
Never include the password in the same email as the PDF — if the inbox is compromised, the lock is meaningless. Share the password through a separate channel: SMS, Signal, an in-person handover, or a password manager's secure-share feature.
Removing a password later
If you own the document and forget the password isn't useful any more, use our free Unlock PDF tool to remove it — you'll need to know the original password to authorize the unlock.
Is the encryption real?
Yes. We apply standard PDF encryption — the same scheme used by Acrobat, Word and Preview. The PDF itself is encrypted on disk, so opening it without the password is genuinely blocked, not just hidden.
Tools used in this guide
Every tool referenced above — free, unlimited, no signup.