Password-Protect a PDF
Lock a PDF with a password using AES-256 encryption, and choose whether people who open it may print, copy text or make changes.
Choose a PDF
Password
Leave both empty to keep the PDF opening freely and only restrict printing, copying or editing.
Advanced
Lets you change the print, copy and edit rules later in Acrobat. If you leave it empty, a random password that nobody sees is used, so the rules can't be changed in other programs.
Preview
Upload a PDF to protect it with a password.
Password stays local
Your PDF and password never leave this browser tab.
AES-256 encryption
The strongest standard PDF encryption, checked before download.
Set permissions
Block printing, copying or editing for people who open it.
Strong encryption, without uploading the file
A password-protected PDF can't be opened without the password. The file is encrypted with AES-256, the strongest standard PDF encryption, which Adobe Acrobat, web browsers and modern PDF apps support.
You can also set permissions to block printing, copying text, editing, or comments and form filling. These rules are tied to a separate permissions password. Leave the open password empty if you only want to set permissions.
Before you download, the tool checks the result: it must refuse to open without the password and open with it. Your PDF and your password never leave this browser tab.
How to use it
- 1Upload your PDF.
- 2Type a password and repeat it.
- 3Untick printing, copying or editing if you want to restrict them.
- 4Click Protect & Download.
Open password and permissions
- Open password: required to view the document at all. This is the real protection.
- Permissions: allow or block printing, copying text, editing, and comments or form filling.
- Permissions password: set your own under Advanced, or a random 32-character one is generated and never shown.
- Encryption: AES-256 by default; AES-128 only for very old readers.
Choosing a good password
- Use at least 12 characters, or three or four random words.
- Avoid names, birthdays and words from the document itself.
- Send the password through a different channel from the PDF, such as a text message.
- Store it in a password manager; there is no way to recover a forgotten one.
About permissions
Acrobat and most readers respect permissions, but some programs ignore them, so think of them as a polite rule rather than real security. If a PDF already has a password, take it off with Unlock PDF before setting a new one here.
Related tools
What Our Users Say
Real feedback from people using WeblixTools, checked by our team before it appears.
Frequently Asked Questions
Is my file uploaded to a server?
No. The tool runs entirely in your browser tab using JavaScript. Your files never leave your device, and closing the tab discards them.
What happens if I forget the password?
There is no way to recover it. The password is never sent anywhere, and AES-256 can't realistically be broken by guessing a good password. Keep an unprotected copy or store the password in a password manager.
Are the print and copy restrictions secure?
They are respected by Adobe Acrobat and most readers, but some programs ignore them. The open password is the strong protection; permissions are a rule that well-behaved readers follow.
Can I set restrictions without an open password?
Yes. Leave the open password empty and choose the permissions. Anyone can open the file, but compliant readers block the actions you turned off.
Will the PDF open on phones and Macs?
Yes. AES-256 is supported by Adobe Acrobat 9 and later, Apple Preview, Chrome, Edge, Firefox and current Android and iPhone PDF apps.
Can I change the password later?
Take the old password off with Unlock PDF (you'll need it), then protect that copy here with the new one.
What does the strength hint mean?
It's a rough check of length and character variety. Weak means under 8 characters or only one kind of character. Aim for 12 or more with a mix of letters, numbers and symbols, or a few random words.