Protect PDF — Free
Password-protect and encrypt your PDF. No signup required. Secure, fast, and free.
Drop your file here
or click to browse · .pdf · Max 25 MB free
How to Protect PDF
Upload your PDF
Set a password
Choose permissions (print, copy, edit)
Download protected PDF
Frequently Asked Questions
1How do I password protect a PDF for free?
Upload your PDF to ZiaSign, set a password, choose permissions (allow/block printing, copying, editing), and download the encrypted PDF. Free, no signup.
2What encryption is used?
AES-256, the same standard used by banks, governments, and military organizations. Your PDF is securely encrypted.
3Can I allow printing but block editing?
Yes. You can set granular permissions — allow printing while blocking editing, copying, or other actions.
4Does the PDF protector add a watermark?
No. ZiaSign never adds watermarks. Your encrypted PDF looks exactly like the original.
Why Use ZiaSign's Protect PDF Tool?
ZiaSign's free PDF protector lets you password-protect any PDF with AES-256 encryption — the same standard used by banks and governments. Set a document open password, control printing/copying/editing permissions, and share your PDF securely. No watermark, no signup required.
Also known as: encrypt pdf · lock pdf · pdf password · secure pdf · protect pdf online free
How-to guide
Prefer the step-by-step version first?
Step-by-step instructions to password-protect and encrypt your pdf with ZiaSign.
Popular Ways to Use Protect PDF
Jump straight to the query-specific guide that matches what you are trying to do, then open the tool when you are ready.
Why teams stay with ZiaSign after the first quick fix
The strongest tool pages do not just solve one file problem. They make the next document task easier to start and easier to trust.
Secure file handling by default
Files are processed securely and automatically deleted after 1 hour so quick PDF jobs do not turn into storage risk.
118 tools and 139 workflow guides
Start with a single tool page, then move into guided document tasks without leaving the platform.
Free to start, deeper when the workflow grows
Anonymous tools cover quick fixes, while accounts, Pro, and Enterprise plans support heavier document operations.
118+
Free PDF Tools
100%
Browser-Based
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Installation Needed
SOC 2
Compliant Security
Trusted by thousands of professionals worldwide. All files are processed securely in your browser or encrypted servers and automatically deleted.
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