Protect PDF
Add a password and strong 256-bit encryption to a PDF.
About Protect PDF
naskh's Protect PDF tool lets you add a password and strong 256-bit encryption to a PDF. It uses standard, well-tested methods so your protection holds up everywhere. It is completely free, runs in your browser with nothing to install, and is built Arabic-first with full right-to-left support.
How it works
Upload your file
Process in the browser
Download the result
Common uses
- Add a password before sending a sensitive document
- Watermark drafts and confidential files to deter copying
- Remove hidden scripts or data before sharing externally
- Control who can open or reuse your documents
Frequently asked questions
Is Protect PDF free?
Yes, Protect PDF is completely free — no sign-up, no watermark, and no daily limits.
Are my files safe?
Files are processed on our server over an encrypted (HTTPS) connection and deleted right after — never stored or shared.
Is there a file size limit?
You can process files up to 20 MB each. For larger files, try Compress PDF first.
Does it support Arabic and RTL?
Yes. naskh is built Arabic-first and preserves right-to-left direction and diacritics — no flipped or broken text.
Do I need to install anything?
No. Protect PDF runs right in your browser on mobile and desktop — nothing to install and no account needed.