Protect a PDF With a Password
Add a password to a PDF with OmnisPDF. Encrypt your document for safer sharing, storage, and submissions — fast and browser-based.
Drop your PDF here
or click to browse files
Supported format: .pdf
Use OmnisPDF's Protect PDF tool to password protect and encrypt a PDF in seconds. Add a password before emailing, uploading, or storing sensitive files like contracts, bank statements, invoices, or personal documents.
- ✓ Password protect PDF files online
- ✓ Encrypt PDFs for safer sharing and storage
- ✓ Great for contracts, statements, medical forms, and IDs
- ✓ Works on Mac, Windows, iOS, Android, and Linux
- ✓ No installation — protect PDFs in your browser
Add a Password to a PDF
Set a password to restrict who can open your PDF. OmnisPDF secures the file using standard PDF password protection so the contents are not accessible without the password.
Protect Sensitive Documents Before Sharing
PDF password protection is useful when sending confidential files by email or uploading to services where you want an extra layer of access control.
Download a Protected PDF Instantly
After protection is applied, download your secured PDF and share it with the intended recipient — share the password separately via a safer channel.
How to Password Protect a PDF
Upload your PDF to OmnisPDF.
Enter a strong password and confirm it.
Click Protect PDF.
Download your password-protected PDF.
Frequently Asked Questions
What does Protect PDF mean?
It means adding password-based security to the PDF so only people with the password can open it.
What happens if I forget the password?
Password-protected PDFs generally can't be recovered without the password. OmnisPDF can't retrieve it — store it somewhere safe.
Can I remove the password later?
Yes. Use OmnisPDF's Unlock PDF tool to remove password protection from any PDF you own the password for.
Can I protect a PDF on my phone?
Yes. OmnisPDF works in mobile browsers — upload the PDF, set a password, and download the secured file.
Is it safe to upload sensitive PDFs?
Yes. All transfers are SSL encrypted and your files are deleted immediately after your session. We never store or share your documents.
What is the maximum file size I can protect?
Free accounts can upload files up to 25MB. Pro accounts can upload files up to 200MB. Business accounts can upload files up to 1GB.