Protect PDF with Password
Add password encryption to your documents — 100% locally in your browser.
Select PDF files
Drag and drop multiple PDF files here, or click to browse.Everything stays in your browser.
Secure Your Documents in Seconds
Protect confidential contracts, financial statements, and personal documents with military-grade encryption — all without leaving your browser.
Upload PDF
Select the PDF document you want to password-protect.
Set Password
Choose a strong password and configure document permissions.
Download
Your encrypted PDF is ready — recipients will need the password to open it.
Why Protect Your PDFs?
Unprotected PDFs containing financial data, legal terms, or personal information can be freely opened, copied, and redistributed by anyone. Password encryption ensures only authorized recipients can access your sensitive documents.
Zero-Trust Encryption
Unlike other tools that transmit your password and document to remote servers, Free PDF Combine performs all encryption locally in your browser using WebAssembly. Your password never touches any network connection.
Need something else?
Explore our other free and private PDF tools.