Protect PDF
Add a password to your PDF and keep it private. Fast, secure encryption right in your browser — no watermark, no signup.
Drop your PDF here
or click to browse — up to 100 MB
Everything you need to secure a PDF
A fast, private and completely free way to password-protect any PDF — right in your browser.
Strong AES-256 encryption
Your PDF is locked with industry-standard 256-bit AES encryption — the same standard banks rely on.
Password to open
Only people with the password can open and read the document. Keep sensitive files truly private.
Works everywhere
The protected PDF opens in any reader on Windows, Mac, Linux, Android and iOS — nothing to install.
Private & secure
Files are sent over an encrypted connection, scanned for malware and auto-deleted within an hour.
Keeps quality
Encryption never touches your content — text, images and layout stay exactly as they were.
Always free
No watermark, no signup and no hidden limits. Protect as many PDFs as you like, completely free.
How to password-protect a PDF in 3 steps
Lock any PDF with a password in seconds.
Upload your PDF
Drag & drop or pick the PDF you want to protect.
Set a password
Choose a strong password and confirm it.
Download
Click protect, then download your encrypted PDF instantly.
When you need to protect a PDF
From confidential contracts to personal records — keep prying eyes out.
At work
- Secure contracts, invoices and payslips before emailing them.
- Protect financial reports and board documents shared with partners.
- Lock HR files, offer letters and confidential agreements.
- Keep tenders, NDAs and legal documents for authorized eyes only.
At home
- Password-protect bank statements and tax documents.
- Secure copies of your passport, ID and certificates.
- Keep medical records and personal letters private.
- Protect any PDF before uploading it to the cloud.
Frequently asked questions
Password-protect PDF online — free and secure
Our Protect PDF tool lets you add a password to any PDF document so only people who know the password can open it. The file is encrypted with strong 256-bit AES encryption, the same standard used by banks and governments, ensuring your sensitive information stays private wherever the file travels.
Simply upload your PDF, choose a password, and download the protected file. The encryption is applied to the file itself, so the password is required every time the document is opened — on any device, in any PDF reader, by email or in the cloud.
Safe, private and lossless
Your privacy comes first. Uploaded files are transferred over a secure encrypted connection, scanned for malware, and automatically deleted from our servers within an hour. We never store your password. Encrypting a PDF is completely lossless, so your text and images keep their original quality. There is no watermark, no registration and no cost.
Ready to protect your PDF?
Upload your file and lock it with a password in seconds — free, secure and watermark-free.