Protect PDF: Password protect PDF free
Lock a PDF with a password. Choose who can open it and what they can do.
100% private. Your PDF never leaves your device. Encryption happens entirely in your browser.
Drop a PDF here or browse
Add a password to protect your PDF · PDF only
What does it mean to protect PDF?
To protect PDF means adding a password so only the right people can open or edit it. Whether you need to password protect PDF for a contract, use a PDF security tool to encrypt PDF file content, or simply add password to PDF before sharing, the tool helps in seconds. Our PDF security tool runs in your browser, so your file and password never leave your device.
How to password protect PDF
To password protect PDF, open the tool and drop in your file, then set a user password to open and an owner password to restrict editing. The PDF is encrypted on your device and downloaded instantly. Because it runs locally, you can secure PDF online free as many times as you like — no uploads, no account, and no waiting. This PDF security tool is the fastest way to lock PDF document content.
Encrypt PDF file and lock PDF document
A good PDF security tool lets you encrypt PDF file content and lock PDF document permissions in one pass. When you add password to PDF, you choose who can open it and what they can do — print, copy, or edit. It is the simplest way to protect document with password for sensitive reports and agreements.
A private PDF security tool
Most tools that help you secure PDF online upload your file and password to a server first. Ours encrypts PDF on your device, so nothing is sent anywhere and the result downloads instantly. There are no watermarks, no daily caps, and no sign-up. For anyone who needs to password protect PDF or use a reliable PDF security tool, this private tool keeps your data safe while you lock PDF document content.
When to use a PDF security tool
Use a PDF security tool whenever you send something sensitive — tax forms, contracts, or ID scans. Protect document with password before emailing so only the recipient can open it. Because you can encrypt PDF file right in your browser, the process is quick and private. It is the easiest way to secure PDF files and add password to PDF with confidence.
Frequently asked questions
How do I password protect a PDF?
Open this protect PDF tool, drop in your file, and set a user password to open plus an owner password to restrict editing. Encryption runs in your browser — free, with no uploads.
Can I encrypt PDF files online?
Yes. This online PDF security tool encrypts your PDF entirely client-side in the browser, keeping the file and password private on your device.
Is adding a PDF password free?
Yes. The PDF security tool is free, with no watermarks, no daily caps, and no sign-up required.
How strong should my PDF password be?
Use a long mix of letters, numbers, and symbols for both the user and owner passwords to make the encryption as strong as possible.
Can I protect multiple PDFs at once?
The protect PDF tool handles one file at a time, so encrypt each PDF separately and download its secured copy.
Does password protection affect file size?
Only minimally — encrypting the PDF adds a small amount of overhead, so your file size stays about the same.
How do I remove PDF protection later?
Use the Unlock PDF tool with the password to strip protection later and save an open copy of your PDF.