Is PDF password protection free on PDFA2Z?

Yes, completely free. No signup, no watermarks, unlimited use.

What encryption standard is used?

We use AES-256 (Advanced Encryption Standard with 256-bit key), the same encryption standard used by governments and financial institutions worldwide. It is virtually impossible to brute-force.

Can you recover my password if I forget it?

No. For your security, your password is never stored on our servers. If you forget it, the document cannot be recovered. Please use a password manager to store important passwords.

Can I restrict printing but still allow viewing?

Yes. Use the permission settings to allow viewing but restrict printing, copying, or editing. Only people with the owner password can change these restrictions.

Is the password-protected PDF compatible with Adobe Reader and other viewers?

Yes. AES-256 encrypted PDFs are fully compatible with Adobe Acrobat Reader, Preview (Mac), Foxit Reader, and all modern PDF viewers.

Can I protect multiple PDFs at once?

Currently, the tool processes one PDF at a time. For batch protection needs, contact us about API access.

Will the file size increase after encryption?

Yes, slightly — typically by a few kilobytes. The encryption overhead is minimal and will not noticeably affect the file size.

An open password (user password) prevents anyone from opening the file without the password. An owner password (permissions password) allows viewing but restricts editing, printing, or copying — even without sharing the password.

Can the password protection be opened on mobile devices?

Yes. Password-protected PDFs open correctly in Adobe Acrobat Reader for Android and iOS, and other mobile PDF apps.

Is my document uploaded to PDFA2Z servers?

Your document is transmitted over encrypted HTTPS and processed temporarily. It is deleted immediately after you download the protected version.

How do I create a strong password for my PDF?

Use at least 12 characters with uppercase, lowercase, numbers, and symbols. Avoid common words or birthdays. Use a password manager like Bitwarden or 1Password to generate and store it securely.

Can I add password protection to a PDF that already has a password?

You would need to unlock it first using our Unlock PDF tool, then re-protect it with the new password.

Password Protect PDF Free

Add military-grade 256-bit AES encryption to any PDF file in seconds. Set an open password so only authorized people can view the document, and control permissions like printing and copying. 100% free, browser-based, no files stored on our servers.

Upload the PDF you want to protect by clicking "Upload" or dragging the file onto the tool.
Enter a strong password in the "Set Password" field. Use a mix of uppercase, lowercase, numbers, and symbols for maximum security.
Confirm the password in the second field to avoid typos.
Optionally, set document permissions to restrict printing, copying, or editing even for people who know the password.
Click "Protect PDF" and download your encrypted, password-protected PDF file.

Is PDF password protection free on PDFA2Z?: Yes, completely free. No signup, no watermarks, unlimited use.
What encryption standard is used?: We use AES-256 (Advanced Encryption Standard with 256-bit key), the same encryption standard used by governments and financial institutions worldwide. It is virtually impossible to brute-force.
Can you recover my password if I forget it?: No. For your security, your password is never stored on our servers. If you forget it, the document cannot be recovered. Please use a password manager to store important passwords.
Can I restrict printing but still allow viewing?: Yes. Use the permission settings to allow viewing but restrict printing, copying, or editing. Only people with the owner password can change these restrictions.
Is the password-protected PDF compatible with Adobe Reader and other viewers?: Yes. AES-256 encrypted PDFs are fully compatible with Adobe Acrobat Reader, Preview (Mac), Foxit Reader, and all modern PDF viewers.
Can I protect multiple PDFs at once?: Currently, the tool processes one PDF at a time. For batch protection needs, contact us about API access.
Will the file size increase after encryption?: Yes, slightly — typically by a few kilobytes. The encryption overhead is minimal and will not noticeably affect the file size.
What\: An open password (user password) prevents anyone from opening the file without the password. An owner password (permissions password) allows viewing but restricts editing, printing, or copying — even without sharing the password.
Can the password protection be opened on mobile devices?: Yes. Password-protected PDFs open correctly in Adobe Acrobat Reader for Android and iOS, and other mobile PDF apps.
Is my document uploaded to PDFA2Z servers?: Your document is transmitted over encrypted HTTPS and processed temporarily. It is deleted immediately after you download the protected version.
How do I create a strong password for my PDF?: Use at least 12 characters with uppercase, lowercase, numbers, and symbols. Avoid common words or birthdays. Use a password manager like Bitwarden or 1Password to generate and store it securely.
Can I add password protection to a PDF that already has a password?: You would need to unlock it first using our Unlock PDF tool, then re-protect it with the new password.