PDF Password Protect — Add or Remove PDF Passwords Free

Why Password-Protect a PDF?

Some documents should not be readable by anyone who happens to receive them. Contracts sent over email, financial statements shared with an accountant, medical records forwarded to a specialist, or internal reports distributed across a company all benefit from encryption. A password-protected PDF requires the recipient to enter the correct password before the file opens — providing a basic but effective layer of access control.

On the other side, you may have a password-protected PDF that you legitimately own — perhaps a statement downloaded from a bank portal — and need to remove the password so you can merge, annotate, or print it without being prompted each time. The remove-password mode handles exactly this case, provided you already know the password.

Add a Password to a PDF: Step-by-Step

1. Open the PDF Password Tools.
2. Select Add Password mode.
3. Click Choose File and select your PDF.
4. Enter a password in the Password field and confirm it.
5. Click Protect PDF.
6. Download the password-protected PDF.

The protected file is encrypted with AES-128. Anyone who opens it in a PDF reader will be prompted for the password before the content is visible.

Remove a Password from a PDF: Step-by-Step

1. Open the PDF Password Tools.
2. Select Remove Password mode.
3. Click Choose File and select your password-protected PDF.
4. Enter the current password for the file.
5. Click Unlock PDF.
6. Download the unlocked PDF.

If the password is correct, the tool decrypts the file and offers a clean, unprotected PDF for download. The original protected file is not modified.

Protected vs. Unprotected: When to Use Each

Encryption Details

The tool uses AES-128 encryption, which is the standard used by most PDF readers including Adobe Acrobat, Preview on macOS, and browser-based PDF viewers. AES-128 is strong enough for the vast majority of use cases — it would take an impractically long time to brute-force a reasonably complex password.

For maximum security, use a password of at least 12 characters that combines uppercase letters, lowercase letters, numbers, and symbols. Avoid dictionary words or predictable patterns. Store the password separately from the file — a password manager is the recommended approach.

Limitations

This is not a password cracker

The remove-password mode requires you to supply the correct password. It decrypts the file using the key you provide — it does not attempt to guess or crack an unknown password. If you have lost the password to a PDF, this tool cannot help.

Owner passwords vs. user passwords

PDF files can have two types of passwords: a user (open) password that prevents the file from opening, and an owner (permissions) password that restricts printing, copying, or editing. This tool handles user passwords. Owner-only restrictions — where the file opens without a password but has printing or copying disabled — are a separate mechanism.

File size and browser limits

Very large PDFs (above 100 MB) may be slow to process depending on your device memory. For smaller documents, encryption and decryption are nearly instant.

Privacy: Your Files Never Leave Your Device

All encryption and decryption happens in your browser using client-side JavaScript. The file you upload is processed in memory — nothing is transmitted to a server. This makes the tool appropriate for documents that contain sensitive personal or commercial information.

Related PDF Tools

Once a PDF is unlocked, you can use the PDF Editor to annotate and modify it, the PDF Merger to combine it with other documents, or the PDF ↔ Word Converter to extract its text for editing. All tools run in your browser with no uploads.