Protect PDF Online Free
Add a password to any PDF instantly in your browser — lock it from opening, restrict printing, copying and editing. No sign-up, no server upload, no watermark.
Drag & drop your PDF here
or click to browse
Any PDF file · Runs entirely in your browser · No sign-up required
Open Password (optional)
Requires a password to open and view the PDF. Without it, the file cannot be read by anyone.
Permissions Password (optional)
PDF opens freely but restricts printing, copying and editing. Set permissions below to control access.
PDF protected successfully
Two Levels of Protection
Set an open password to prevent anyone from viewing the PDF without the key. Set a permissions password to let the PDF open freely but block printing, copying or editing. Use both together for maximum security.
100% Private — No Upload
All encryption runs entirely inside your browser using JavaScript. Your PDF is never sent to any server, never stored and never seen by anyone else. Completely private and secure from start to finish.
Granular Permission Control
Go beyond a simple password. Control exactly what recipients can do — allow or block printing, text copying, editing, annotations, form filling and accessibility features individually.
How to Password Protect a PDF Online — 3 Simple Steps
Adding a password to your PDF takes seconds with FreeConverto. No Adobe Acrobat needed, no account required — your file never leaves your device. If you need to remove a password later, use our free PDF unlocker. To reduce file size before sharing, try our free PDF compressor.
Upload Your PDF
Drag and drop your PDF or click to browse. Any PDF works — existing passwords, forms, scanned docs included.
Set Your Password(s)
Enter an open password to lock the file, a permissions password to restrict actions, or both. Choose which permissions to allow.
Download Protected PDF
Click Protect PDF. Your encrypted PDF downloads instantly — ready to share securely with no sign-up and no watermark.
Important Reminder
Keep a safe record of your password. If you forget the open password the file cannot be recovered — encryption is permanent by design.
Frequently Asked Questions
How do I password protect a PDF online for free?
Upload your PDF, enter your chosen password, configure any permission restrictions, then click Protect PDF. Your encrypted PDF downloads instantly — no sign-up, no watermark and no server upload required.
What is the difference between an open password and a permissions password?
An open password (user password) is required to open the PDF at all — without it the file cannot be viewed. A permissions password (owner password) lets the PDF open freely but restricts what readers can do, such as printing, copying text or editing the document. You can set either or both.
Can I restrict printing or copying without setting an open password?
Yes. Set only a permissions password and configure the checkboxes to disable printing, copying or editing. The PDF will open without any password but those actions will be blocked. This is called owner-only protection.
What encryption does this tool use?
The tool uses 128-bit RC4 encryption, the PDF standard supported universally across all PDF readers including Adobe Acrobat, Apple Preview, browser PDF viewers and mobile apps on iOS and Android.
Will my PDF be uploaded to a server?
No — all encryption happens entirely inside your browser using JavaScript. Your file never leaves your device and is never sent to any server at any point.
What happens if I forget the PDF password?
If you forget the open password there is no recovery — the PDF cannot be opened without it. Always keep a secure note of your password. If you need to remove a password you already know, use our free PDF unlocker.
Does protecting a PDF change its content or quality?
No — encryption only adds a security layer to the PDF structure. All content, images, fonts and formatting are preserved exactly as in the original document.
What other free PDF tools does FreeConverto offer?
FreeConverto offers a full suite of free PDF tools including a PDF merger, PDF splitter, PDF rotator, PDF compressor, PDF watermark tool, PDF to JPG converter, PDF unlocker and PDF OCR tool. All 100% free with no sign-up.