Unlock PDF

Password protect a PDF with an easy online tool. Protect sensitive content with trusted PDF encryption.

Encrypt PDF with open password and copying, printing permission. It's a free, secure and easy way to protect your PDF.

Protect your PDF files by adding a password to those documents with our safe and easy-to-use online tool. Add permissions to your PDF files for FREE!

No file size limits, no ad watermarks - A simple and secure web app to encrypt your PDF files with strong AES 128-bit encryption for free.

No registration or watermarks. Simple and secure way to password protect your PDFs with strong AES 256 bits encryption.

Protect your PDF files online by adding a password that will prevent people from being able to copy or print your PDF document. Secure PDF files for free.

Encrypt your PDF files using 256-bit AES encryption to prevent anyone opening your PDFs without a password. There is no way to brute-force or reverse engineer ...

Encrypt and protect PDF with a password to safeguard sensitive information. Secure your PDF files online, with ease and without registration.

Unlocking a PDF is easy with Smallpdf. You just need to upload your PDF, enter the password (for strongly encrypted files), and download the unlocked PDF!

設置一個密碼來保護PDF文檔中的敏感資訊。輕鬆地線上保護你的PDF文檔，且無需註冊。