How strong is the encryption?

We use PDF-standard AES-128/256 or RC4 encryption via pdf-lib — the same bank-level algorithms specified in the PDF security model. Strength depends on your password; choose a long, unique passphrase.

Does my file upload to your servers?

No. Processing is 100% local in a browser Web Worker. Your PDF bytes never leave your device — there is nothing for us to store or auto-delete.

What if I forget the password?

PDF passwords cannot be recovered — that is by design. If you forget the password, the file is permanently locked. Always keep a backup of the original unprotected PDF.

Can I protect PDF online for free?

Yes. Standard-sized PDFs password-protect free with no account. Massive 100MB+ files and batch jobs require Premium via Lemon Squeezy.

Is this easy PDF password protection for beginners?

Yes. Drag your file, type a password, download — no technical setup. The pdf protector handles encryption automatically.

Canonical Protect PDF Tool

Protect PDF Online — PDF Password Protection

Q: How to password protect a PDF?

Open your PDF in our local protector, enter a user password, and download. pdf-lib encrypts in a Web Worker — no server upload.

Need to protect PDF online without sending files to a server? Our pdf protector runs entirely in your browser — apply pdf password protection with bank-level AES/RC4 encryption while your secure PDF document never leaves your device. Basic protection is free and instant.

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How it works

1
Open your PDF locally
Select a PDF from your device. A pdf-lib Web Worker loads it in Tier 1 local processing — zero server upload, so you can password protect PDF files with absolute privacy.
2
Set your password
Enter a user password to secure PDF pages. Encryption follows PDF standards (AES-128/256 or RC4) — easy PDF password protection in one form field.
3
Download the protected PDF
Export your locked file instantly. Basic password protection is free; batch jobs and massive 100MB+ PDFs require Premium via Lemon Squeezy.

Use cases

Lock personal tax returns

Password protect PDF tax forms before storing in cloud drives — your pdf protector keeps SSN pages off open shares.

Secure client deliverables

Apply pdf password protection to proposals so only the intended recipient can open the secure PDF document.

Protect medical records

Secure PDF health summaries locally before emailing — files never upload, so no auto-deletion policy is needed.

Guard intellectual property

Protect PDF drafts with encryption before sharing externally — learn how to password protect a PDF in under a minute.

Problems we solve

Upload-based tools leak files

Most online protectors send your PDF to a remote server. Ours processes 100% locally — your file never leaves the device.

Weak or fake encryption

Some tools only add a viewer lock. We apply real PDF-standard AES/RC4 encryption through pdf-lib — bank-level protection.

Desktop subscriptions for simple locks

Skip expensive Acrobat plans for a one-time password. This pdf protector runs free in any modern browser.

Specialized Protect PDF guides

Trust & privacy

100% local browser processing

pdf-lib Web Worker handles protect-PDF jobs entirely on your machine — no cloud upload, no retention risk.

Bank-level PDF encryption

AES-128/256 and RC4 per PDF specification — the same standards used by enterprise document security tools.

Free basic protection

Everyday password locks are free with no signup. Premium unlocks batch protection and 100MB+ massive files via Lemon Squeezy.