Lock PDF
Files
Select a PDF and set a password to protect it.
Drop files here or
Accepted: PDF
All processing happens in your browser — your files are never uploaded to a server.
About this Tool
Add an open password to any PDF so only recipients with the password can view it. Ideal for securely sharing confidential documents and preventing unauthorized access. All encryption runs entirely in your browser — no files are uploaded to a server.
100% Secure Local Processing Active
This tool runs entirely on your device via WebAssembly and browser Canvas. No files are ever sent to any remote server, ensuring complete data security.
How to Use
Upload the PDF file you want to protect.
Enter a password and re-enter it in the confirmation field.
Click 'Lock PDF' to download the encrypted file instantly.
Core Scenarios
Protecting Confidential Contracts
Password-lock an NDA before sharing it with a partner company so that only the intended recipient can open the file.
Restricting Access to Internal Reports
Encrypt an executive financial report so only recipients who know the password can open and read it.
Frequently Asked Questions
RC4 128-bit encryption via the pdf-lib-with-encrypt library. The resulting file is compatible with Adobe Acrobat, browser PDF viewers, and other standard readers.
The file cannot be recovered without the password. Make sure to store it somewhere safe before locking the document.
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