Protect PDF
Add password protection to your PDF files
Drop your files here
or click to browse from your device
.PDF files • Max 200MB
Strong Encryption
Secured using client-side AES-256 standard encryption.
Privacy Guaranteed
Password locking is computed locally. Your document never leaves your machine.
Add password protection to a PDF before sharing it with a recipient. Use a strong password and share it through a separate trusted channel.
How to use Protect PDF
- 1.Select the PDF you want to protect.
- 2.Enter and confirm a strong password.
- 3.Create the protected copy and download it securely.
About this PDF tool
Password protection can reduce casual access to a document, but it does not replace careful sharing practices. Keep a secure record of the password because recovery may not be possible.
Common uses
- Protect a private report
- Secure an invoice or form
- Add a password before email sharing
Privacy and local processing
SelfPDF’s core PDF file tools are designed for browser-based processing without an account. AI-powered tools may send the text needed for their AI task to an external AI service. Process only files you are authorized to use, and keep a local backup of important originals.
Frequently Asked Questions
Can SelfPDF recover my password?
No. Keep your password safe because a forgotten password may not be recoverable.
Does protection change the original?
No. The tool creates a protected copy.
Is password protection a complete security system?
It is one safeguard. Also use secure sharing and access controls appropriate for the document.