Protect PDFs with Passwords Online for Free
Secure your PDF documents with a password. Free online tool to protect PDF files with 256-bit AES encryption.
Security Setup
What is a PDF Password Protector?
A PDF password protector is a tool that lets you lock a PDF file with a password so only people who know the password can open and read it. This is useful when you are sharing contracts, reports, invoices, or any document that contains sensitive information you do not want just anyone to access.
ContentAnchor's PDF protector works directly in your browser using 256-bit AES encryption. You upload your files, set a password, and the tool locks each PDF on your device without ever sending your files to a server. You can protect multiple PDFs at once and download them individually or as a zip file.
How to password protect a PDF?
- Enter a password: Type the password you want to use into the password field. You can toggle the eye icon to see what you are typing before you proceed.
- Upload your PDF files: Click the upload area and select one or more PDF files from your device. You can add as many files as you need and they will all appear in the file queue.
- Protect all files: Click the Protect All Files button. The tool will process each PDF one by one and apply the password you entered to all of them.
- Download your protected PDFs: Once a file is processed, a download button appears next to it. You can download files one at a time or use the Download All button to get everything in a single zip file.
- Test before sharing: Open one of the downloaded PDFs to confirm it asks for the password before opening. This way you know the protection is working before you send it to anyone.
Frequently Asked Questions (FAQs)
Is this PDF protector free to use?
Yes, it is completely free. You can protect as many PDF files as you need without creating an account or paying anything.
Are my PDF files uploaded to a server?
No. All processing happens locally in your browser. Your files never leave your device, so your documents stay completely private and secure.
What type of encryption does this tool use?
The tool uses 256-bit AES encryption, which is the same standard used by banks and government agencies. It is one of the strongest encryption methods available for PDF files.
Can I protect multiple PDFs at once?
Yes. You can upload and protect multiple PDF files in one go. All files in the queue will be locked with the same password you entered and you can download them all as a zip file when they are done.
Can I remove the password from a protected PDF later?
To remove a password from a PDF you would need a PDF unlock tool. Make sure you save the original unprotected version of your files before applying a password, just in case you need to access them without restrictions later.
Does this tool work on mobile?
Yes, the tool works on all devices including phones and tablets. You can upload, protect, and download PDFs directly from your mobile browser without installing any app.
Related Tools
Explore more tools to manage and work with your PDF files: